Beer is also proven to make you smarter, in line with Darwin's theories. A herd of buffalo can only move as fast as the slowest buffalo. When the herd is hunted, the slowest and the weakest ones at the back are killed first. This natural selection is good for the herd as a whole, because the speed and health of the group keeps improving from the regular killing of the weakest members. In a similar way, the human brain can only operate as fast as the slowest brain cells. Now, it's already proven that excessive intake of alcohol kills brain cells, and naturally it attacks the slowest and weakest brain cells first. Therefore, regular consumption of beer eliminates the weaker brain cells, making the whole brain a faster and more efficient machine. This is why you always feel smarter after drinking a few beers. 🍺🍺
I have been using the A111 from acconeer for some projects ( measure foiling height of a racing solar boat ). Fun to use and if you pick the right development board also very affordable. One could even use plastic lenses to change the opening angle vs distance .
Beer is much better than water. And Rivella is much better than water too. Oh, I miss Switzerland! I'm coming back to Graubunden right after the pandemic. -Frank
@@AndreasSpiess please let me invite you to Silicon Valley. I would be glad to introduce you to my friends and host you for a great meal. Or meet me in Shenzhen, the Disneyland of Chinese cities! I plan to go back there for my Esp32 wristwatch project once the pandemic is better here.
Thank you for the invitation! I plan to come to the next Hackaday Supercon whenever it is. And I also plan to go to Shenzen to visit a few companies I work with. So we have three possibilities to meet: US, Switzerland, or China ;-)
@@AndreasSpiess Marvelous. I am Frank Cohen, fcohen@votsh.com, I am working on an ESP32 Internet connected wrist watch to display home videos of my kids on my wrist. My previous maker project: startlingwatch.com. Seems to me there is a gap when working with ESP and Arduino projects that need to connect to a Cloud service. I'm intending to fill the gap with github.com/frankcohen/ReflectionsOS. Please send me an email and I will send you my details. Merci.
One nice thing about the RCWL-0516 I just found out is, that you can use Pin 5 to get the direct analog signal and write your own detection algorithm. Especially useful if a esp8266 etc. generates false positives on the circuit. You can use the analog signal even for sleep tracking... Btw nice video, as always :)
You are right, you get the analog signal on a BISS pin. I never looked in the false positives. It seems they are reported with Wi-Fi modules. According my video the sensors work around 3GHz and Wi-Fi is at 2.4GHz. So the false alarms most probably come from the Wi-Fi signals. So a good algorithm could be to switch WiFi only on after an alarm is triggered.
@@AndreasSpiess Thanks for the clarification. For my purpose the disabled Wifi was not an option because I wanted to implement a presents detection over multiple rooms to turn on and off the light accordingly (as fast as possible). With the one analog pin on the nodemcu and some threshold fine tuning it now works pretty well :)
Good to know, thanks! I had already written off the RCWL-0516 for my project. So I can just connect the pin labelled CDS to an ADC on my ESP? Or did you mean pin 5 on the IC?
@@EatRawGarlic The IC pin. On the BISS0001 (very similar to the one used on the RCWL-0516) it is labeled "2OUT" pin. So you have to solder a bit ;) (It is actually the pin 12 in the datasheet. They start counting at the bottom left in a counter clockwise direction).
Před rokem
@@AndreasSpiess or 5G, depends however on if the lower part of the n77/78 spectrum is used. I guess these modules have a pretty wide detection range.
Radar is a very interesting subject, I enjoyed this video for my Sunday tech fix, ie brain stimulus. This video had me reminded of some badly engineered radar systems which had recorded nearby buildings doing over 100 kilometers per hour, that was quite some time ago that I read that somewhere. The story still makes me smile. Modern radar where they look at the phase angles of the reflected waves is amazing, resolving one wave length at those frequencies to within a few degrees is precision stuff. With triangulation one can position stuff and monitor movement with precision. Anyhow, rambling on, but it's so interesting. Thanks for the video, have lovely Sunday further. Kind regards, South Africa
Yes, technology moves fast in the direction of more precision and higher speeds. Cars use already 70GHz radars which seem to have ranges of a few 100 meters. The small range finders also work with phase shift detection, BTW and are also very precise.
I bought a TFMini lidar module when you showed it in your LIDAR video. It reached 15 m range with 1 cm accuracy, outdoors, with strong sunlight (the target was 1.5 m, white). It seems better compared to the radar sensor. Also it works indoors and was cheaper, around 40$. A good buy.
Excellent, this was helpful. I never could get the RCWL modules to work, my understanding of them was wrong. But now I have two CDM324's, this should be fun. Your old stuff is still good and interesting. Cool.
Great video. Comment, pir vs radar. In alarm systems radar based detect best targets moving towards or away from sensor. Pir is detecting movement crossing sideways. Pir works like a 1 point temperature meter. The fresnel lens in front creates small areas in the view field. So that hot object moving across will induce big changes. Without the lense it would only measure average heat on area, and not notice movement inside area. Still would notice big heat entering the meter area.
Thanks for this great vid and overview! I just had to retire my CDM324 which I used as a raindrop sensor. After several years in service it started to produce a lot of false positive. I have to investigate the root cause. In my drawer still sits a RSM2650 with quadrature output. I will see how to continue. As PIR sensors, the aquara zigbee motion sensors are interesting. They are very small and contain also kind of luxmeter. So, they are easy to hide and to integrate in a room.
This is the "expensive CDM324" I mentioned. I also should have one in the drawer but never used it. I bought it for our bicycle project. Concerning the aquara zigbee sensors: I have two of them in my lab and they work very good
Hello Andreas, thanks for the great video as usual. It is very informative and gives a good overview over radar sensors. By the way it is also possible to use an FSK modulation to measure the distance to moving objects. This makes it easier to filter out the environment in comparison to an FMCW distance measurement. Further the accuracy is better in comparison to FMCW because with FMCW the distance resolution is limited by the allowed usable bandwidth what is 200MHz at 24GHz. This gives a distance resolution of only 75cm for FMCW in the 24GHz band. With FSK it is possible to reach a much better resolution down to app. 5cm or even more. The K-LD7 from the company RFbeam located in Switzerland uses this modulation to measure the distance of moving objects. It is fully digital and has already a powerful FFT signal processing included.
Thank you for the info. I did not know about FSK in this application. Reading the documents, it seems, FSK only measures distance for moving targets. Is this true? The module is interesting. I will try to get one for some tests. If it really detects cars at 30m, it would be very good.
@@AndreasSpiess Hello Andreas. Yes with FSK you can only detect moving objects and no static ones. With FSK it is only possible to separate objects over their speed and direction and not over distance in comparison to FMCW. This means that if you move the sensor itself all static objects will become moving objects with the same speed and you can separate them only over the direction -> For example if you are moving forward and pointing behind you all static objects will become moving objects with a negative speed and if a car or something is driving towards you it will have a positive speed. Because you can separate the objects over the direction it is possible to filter out the so called clutter to only detect the car (simple blind spot detection). With maximum sensitivity it is even possible to detect cars up to 50m as long as you work with the RAW target list and not the tracked one. RFbeam has also a simple Doppler movement detector and speed measurement sensor in its portfolio what is cheaper and has a better sensitivity (K-LD2).
I'm thinking perhaps one beer just wasn't enough to get the results you were anticipating. I'd go for 3 to 9 beers and recheck the results. If that doesn't work then drink 3 more and turn on some good music and relax for a while. Also the shoes looked fine to me. If anyone complains. They can buy you some Hoka running shoes and resolve that problem. As always good video. .
Thanks for your sunday morning update on sensors, as always very informative. However you may want to mention that you're a guy with a Swiss GERMAN accent, as other parts of Switzerland do have their own funny English accent 😉
Hi Andreas. Hope you are doing well. I read that you asked people not to email you and so I'll ask you here. My dad is turning 70 this friday, the 16th and you are his favorite youtuber. He is a doctor (nephrologist), but recently (about seven years ago) he discovered a big interest in electronics and programming. It really makes my heart melt to see him excited when receives the notification that you have uploaded a new video, when he explains something that he learnt from you or he says your catch phrase "the guy with the Swiss accent". He also buys the gadgets you suggest through your links. Well, I am meaning to ask you if you could wish him an happy birthday. Not even through a video or anything complicated. A simple message would surprise him a lot. With covid, we have just been reaching out to the rest of the family and his friends to gather some messages and I'm sure it would mean the world to him, to see something from you in addition. Thank you so very much for your time and attention and hopefully you'll see this in time. :) Carolina
An advantage of radar over PIR is that it will continue to work when ambient temperature is close to human body temperature. I discovered this in the heat of last summer, when our outside pir sensors stopped working, becoming blind to body heat, even during the middle of the night.
I had this gun thing intended for golf, which could tell speed over really long distances as well as measure long distances. It used laser, but no laser was visible. I no longer have it, and I never really worked out how it worked so well. It worked in daylight up to 400m! Honestly it scared me because I kept looking into the wrong side and feared I would injure my eye :)
I once made a video about a probably similar device. It was able to measure distances to 1500 meters in daylight if I remember right. But it is interesting that yours worked with a flying golf ball! A very small target.
Hi Andreas, thank you, you are great. Now I understand what it takes to measure presence, speed, distance and direction. The only thing I don't understand is how multi-target detection works.
FMCW is not new. In the late 70's it was called chirp-FM radar (because the short FM sweep sounds like the chirp a bird makes). I know, it was part of my Master's thesis. The problem back then was the you needed to do the Fourier Transform to get the range to the target. The computers that could do back then were to big and heavy to fit on aircraft. My thesis was on an alternative technique that used hardware (multipliers and a CCD transversal filter) to do the Fourier Transform. I recall that one of the problem I had was the the frequency difference introduced by return response delay (caused by the range to target) was very similar in frequency to the doppler shift. This became an major problem when the transceiver was on something that was moving (like an airplane). The ground was usually much closer than the target so the return response from the ground would be doppler shifted and much stronger than the response from the target. I suspect that narrowing the beam using something like a phased array and/or fancy processing (like comparing the response time) could help discriminate between the two now.
You are right. Most of the basic technologies are old. What is mindboggling is how cheap we can build them today. We did the FFT with an ESP32 and it was faster than needed ( we only wanted to detect 25km/h, not airplanes ;-) I would assume that the doppler effect is constant over a few chirps and therefore probably can be eliminated. But I am not an expert like you. My thesis was to increase the listening speed for news without increasing the frequency. Also a feature which is built-in in today's smartphones...
I was playing around with the little cheap radar devices with the goal of building another tool for ny daughter and niece who play at ghost busting. I am afraid I must, however take a break as I recently found that the pain in my back is not from the injury that has been paining me for over 20 years but a cancer tumor larger then a grapefruit on my right kidney. It must be removed as soon as the doctors can schedule the surgery, in early December, they say now. So I may well be out of it for some time, I am in hopes that this is the only cancer they find when they operate, they believe it is, so this is a good sign they tell me. I look forward to more projects when the healing is over and I can get back into electronics. So until then, please keep me in mind. Thanks
I see DM-19 doppler speed sensor going for under 50$ in aliexpress. 25 m max. range for vehicles and measuring up to 150 kmh. There is also DM-20 sensor with 40 m vehicle range but cost is 120$. I have many times thought about constructing some kind of car mounted sensor that would tell me the speed difference between me and the car driving in front. I could then use this speed difference information to adjust the non-adaptive cruise control to match.
Automotive FMCW radars use a fast series of different frequency gradients. By comparing different frequency gradients you can measure speed and distance. In addition they have usually several antennas and can detect also the direction of the signal without any moving parts.
@@AndreasSpiess I'm not allowed to tell you exact prices. The complete sensor including an ECU that evaluates the sgnals and doing all things like calculateing if an autonmous braking is needed is definetly below 100€ of hardware costs. What I observe is that the next sensor generations become significantly better but not necessarely much cheaper. It seems that classical FMCW isn't used for actual/next sensor generations. They use a method called "chirp sequence".
Thank you for your information. I can imagine they use newer technology. Also phased arrays seem to be used to get some directional information. Maybe we will get them from old cars in a few years ...
So far I never saw 2.4GHz sensors. So good to know. 60, 77 and 79GHz seem to be common these days in the car industry. And I saw that they sell collision avoidance radars with 150m range for less than 50 dollars. Now we just have to hack them...
Very interesting. I was hoping you'd eventually have more luck in measuring the speed of cars. It almost seems like it might be better to just buy a $99 bushnell and interface with it using an arduino
@@AndreasSpiess there's another guy on CZcams who worked out how to interface with the Bushnell Velocity speed gun using an Arduino. I'm probably going to try do the same thing, but with an ESP32
I didn’t read the previous comments about your shoes but I am assuming your fans highlighted how fit for purpose they are, thanks for a very informative video.🙂
Great tutorial. Did you look at new 60 GHz chips? From Acconeer, XM122? pulse coherent radar, and Infineon doppler, aim to compete with PIR so very cheap in quantity but hard to integrate, short range unless use dielectric lenses, very low power.
Interesting technology. So far I did not look at it. I am more interested in the longer range sensors. But it seems that the development towards highest frequencies is fast. So I will have an eye on it.
Thank you for your effort and work on this topic! I’m looking for a sensor that I can use to track golf shots! So it has to accurately find a small object , preferably also detect the golf club and it’s Speed, and Launch angle of the Golf Ball. As well as speed.
You have to go to the golf pages. There they sell golf trainers which measure all the club movements. I am not sure if you also can get a device to track the ball.
The SMR-3x3 (333/313, etc) series sensors from InnoSent not only measure speed, but also distance, direction and have various angles of detection and are half inch size and are under $20
I suspect your beer test results were due to insufficient quantity. Suggest retesting using quantities 2-10. To avoid the negative brain attenuation that could occurring while testing, your may need a human helper or some other walk-assist device to complete the test procedure.
I found that Seeed now has various 24 and 60 radar. Some of them can remotely measure breathing and heart frequency. Some have fall detection and other distinguish between active and non mobile presence (like someone sleeping). Maybe this could be interesting to re-visit the topic.
Hi, I want to use a CDM324 to detect the presence of people in a room like the DFRobot mmWave Presence Detection Sensor does, so I'm not intrested in messuring speed at all. What would I have to change on the circuit around the sensor to just detect presence of humans?
Hello, I appreciate your video; it was very useful. I also have a question about the sensor's sensing angle. I read that this sensor doesn't have a blind spot, but I want to reduce the sensing angle. I don't need it to sense 360 degrees, just between 100 to 180 degrees. Is it possible to reduce the sensing angle of the RCWL-0516 sensor? Alternatively, can you suggest some common materials that absorb microwaves and don't affect the waves? thank you
I need your help with some issue, I want to measure the clothes wet/dry using a microwave sensor just thinking about how to brake any sensor famous in the market to sender and receiver and I put the clothes in between
These sensors use integrated chips with transmitters and receivers. I do not think you get the field strength out of them because this is not needed for their typical application.
Thanks! It is interesting to know that the Aliexpress website and probably most similar websites only sell consumer products. When asked, Aliexpress said that to buy using a company, you must register as a Dropshipper, that is, you will only pass the product on to the consumer, there is no way for a company to buy for use on these websites, which is ridiculous.
Andreas, your radar sensor series inspired me to build a detector to know when my cat is at the door, and want to come in. Problem is that it works to good. I mounted the sensor inside a bean can and then placed it tightly mounted on the wall with the opening of the can facing outside direction, i was thinking it would make it directional and that no reflection could interfere, but no, still detecting me pasing from behind. Is the metal can now acting as an antenna? Any idea how to fix this? maybe a video?
As I mentioned: The cheap presence detectors are receivers and are very omnidirectional. I never experimented with them. Connecting the can to the ground pin is the only idea I would have.
nice video, but one question, shouldn't be received and transmitted signal graphs named another way around, in FMCW section, cause i think received signal is the one which is late on time axis which should be in front transmitted signal. thank you
Not influenced by light well this would have become stupid me hand a few years ago :), when I was trying to detect of the blinds are closed with an infra-red sensor, forgetting that sunlight has also infra-red. The sensor was always triggered :). I still have the sensor but recently unsoldered everything. One day I will take a go at it again, now knowing more about sensors and considering using libraries and datasheet :D.
IR remote controls use modulated IR (38kHz). Because sunlight is stable it is easy to distinguish between them. You even get IR diodes with 38kHz filters built in for cheap. I once made a video about it if I remember right.
I have somewhere in my notes that you have reviewed the HFS-DC06 presence detector radar sensors before, which operate on 5.8GHz ISM. You didn't mention it again? Or did you referene it under a different name? I am confused 😅
This sensor uses the same principle as the rcwl-0516 and it was covered in this video. I did not remember that it works on a different frequency. So I forgot to mention it in this video :-(
Hi thank you for efforts and the information. I have made a project to my daughter with microwave motion sensor to detect human behind a wall ,working well, but is there anyway to measure the distance for the human movement from the wall. Appreciate ideas.
An easy trick with the CDM320 / HB100 to know direction of movement and looking at the VOUT amplitude with time: if going up it's likely that the object is moving towards you, and vice versa
@@AndreasSpiess FYI I'm the guy behind limpkin.fr... I have a new board on my desk with a new amplification chain and a stm32 to do an FFT on a CDM324 amplified output :)
Cool! Your page is very good. Where do I find the info about this board? This looks very interesting! What is the range you get? Maybe you send me a message to exchange the email addresses? BTW: I was not aware that you live in Switzerland...
@@AndreasSpiess I'll publish it all on github the moment I can check it actually works! I can send you one prototype if you'd like... I'll send you a message then!
hi Andreas, thanks for the video, do you think is possible to scrape off the copper part that connects the transmitter and receiver of the FM24-NP100 module at small antenna, solder an sma connector and attach a more gain MIMO antenna to it to increase the mesurement distance, I could also opt for a small power amplifier to increase transmittin power by a few milliwatts, let's give 3 or 4mw, the point is that I need 70 meters for my project. having said that, do you think it can be done or is the limitation of the distance is a problem more related to the difference in measurable frequency than to the power? Thanks in advance
These are very short wavelength and antennas are difficult to build. I would not try it myself. The whole setup of those sensors are not made for long range. Look at the long range sensors. Their antennas are much bigger and they use much more power. And they are very expensive :-(
@@AndreasSpiess hello andreas, thanks for the reply, I searched a bit on the net, and yes,they are actually expensive, you wouldn't have any links of the cheapest you could find, thanks again
Considered putting the sensor on an oscillating stepper or servo and trying to map the environment? Might also give a better idea of the directional characteristics. Have another beer or two. That will make it work, for sure.
Another viewer found the reading frequency of the distance radar: 10 Hz. Probably a little slow, but it would be cool to have an "air traffic radar" at home...
Hello Andreas! Thanks for the great video! I am also interested in radar technology and would like to clarify that there are radar sensors that can measure the vital signs of people, such as pulse and respiration.
Oh those cheap RCWL sensors don't contain a transmitter? I honestly am very confused with that for years, I always thought they also work on some kind of doppler effect.
It is a resonator which is influenced by the environment. It is well possible that it the effect is capacitive, But I am no specialist in regenerative receivers. I just tell things I read.
Hello Mr Andreas Spiess, i am looking now for some time for an alternative for the common rainsensors that work by water conducting on a plated board. But there is problems with corrosion and these sensors are not very precise when it goes to tell when it _stopped_ to rain because water stays on them for some time. Would these Radar Sensors be an alternative to that? I have looked up a lot and could only find very expensive equipment for professional meteorologists. Maybe you have an idea.
I want to make a fast rotating Ka band radar detector with a super high polling rate so I can have really accurate 360 degree direction finding compared to the radar detectors on the market today that only have front or rear direction finding.
Ooh, we finally get reasonably cheap FMCW radars for hobby projects! The UART on the FM24-NP100 sensor has an Rx pin. The factory manual says it's reserved. Maybe it could be used for modifying settings like radar power or update frequency?
@@AndreasSpiess I also did not dig past the manual. In fact, I hadn't found much information about it at all. Google gives me various links to shops selling it and not a single Github or other DIY project. I am thinking about contacting the manufacturer for some info.
There are 30-40 tons of olive oil tanks between 6 - 10 meters. Here the tanks are in the domestic environment. It is at a fixed temperature at an average of 20 degrees. The level is wanted to be measured here. You think it makes sense to use ultrasonic, ridar or lidar. Or let me ask. Considering contamination or price performance in the environment, will the choice change?
6-10 meters is not easy with ultrasonic or standard Lidar because your sensor usually sits maybe 2 meters above. So you need a range of 12m. I made a video about this topic where you find other possibilities.
Greetings and thank you very much for this video. I have a question, I would like to measure the movement of a piano key, it is a very short distance in the order of mm, what sensors could I consider taking into account an accuracy/price ratio? Thank u so much in advance!
@@AndreasSpiess Thank you very much for your reply. I would like to measure the speed. They use a CNY70 in this project, and I was wondering if you can think of any sensors that might work better. czcams.com/video/PLwpEU9NLPA/video.html&ab_channel=CyberGene
Maybe you have a look at the VL6180X. It has only a range up to 10cm.
Před rokem
1:35 actually, this depends. The AirTag for example uses frequencies above 7 GHz as far as I’m aware, but the power must be strictly limited, usually to -35 - 0dBm @ 50 MHz bandwidth. At least the BNetzA states power limits for UWB, but it‘s not in the ISM section. I wonder if the 3 GHz ones will cause trouble with 5G n78.
UWB is a very different topic because its bandwidth is extremely big (GHz) and it includes bands that are used by other services. With the coin cell of an Airtag you are not capable to bridge more than a few meters. So no big problem in my opinion.
It would be helpful to have a video for visualizing this data and, very importantly, how to use multiple radar sensors for triangulation, etc. I need to record the data from objects moving over time in a very visible way.
You can try a couple of the first category. But people report false alarms with ESP boards in their vicinity. Maybe the HB100 with electronics could be a choice. But I never tested its range.
@@AndreasSpiess I had some luck separating the ESP and the sensor. I wire a 3.5 mm audio socket into my enclosure and connect the IO pin and power to that. I have a matching socket on the enclosure for the sensor and they connect together with a standard 3.5 mm M to M cable. I also include a capacitor in the box with the sensor to level out power issues.In this way I can swap out sensors easily. Just make sure to power off the device prior to plugging or unplugging the sensor or cables.
Very useful video, thanks! Particularly the comparison chart of the various sensors. For the project I want to do, though, I need to connect an esp32 to a sensor that will trigger within a few milliseconds (5 max), so I can calculate speed, using either one or two sensors (with a distance to 10cm, or so, apart). So far, I haven't found anywhere that shows this information and I wondered if you had come across it in your research. Ideally it would be directional and cheap. The RCWL-0516, HB100 and the CDM324 seem the obvious candidates but all of the sensors I have tried so far seem to have a sampling rate or refresh rate, which means that they cab be too slow to react to an object passing the sensor. most recently, I tried the GP2Y0A21YK0F but, again, it was too slow. Any suggestions? 🤔
These sensors are not precise enough for this purpose. You either use the CDM324 to directly measure speed (I once made a video), or you use IR sensors to measure time between two points.
Hello Mr Spiess, Nice video. I have a question please. I wish to protect my fruit trees from air borne and ground attack animals at a distance over a wide area without great expense or use of poisons. PRS radar will do this I beleive. Question can your device upgrade to become a transceiver at 5 watts rf ,fmcw - pulse doppler FMCW with high power - low power mode . The anntena could use your aerials, linked together maybe in a stacked array that is swr stable increasing radar abilities . I guess the alarm output could be a tone or a strobe at the unit. Programing the device would be I bit tricky. Probably not you normal question Mr Speiss Thanks for your shows. Andrew Nz
Do you know of a sensor that detects non-moving presence such as the mmWave sensor in the Aqara FP1? I’d like to build something similar to this so I can detect presence of non-moving humans in a room. Very useful for the living room as people may be present but watching TV and not moving. Cheers 😊
Any guess what module Garmin might use for their Varia RTL516? The range is quite impressive. I tried to build a similar car approximation detector with a LIDAR Light v3, however this seems to be limited to 40m only.
I find your argument for preferring beer to water very interesting and original. Never considered that factor before. 😄🍺
You see, there is always something to learn ;-)
@@AndreasSpiess I think we need more -beer- data!
This needs extensive testing with different beers and volume.
Are you looking for a volunteer.
Beer is also proven to make you smarter, in line with Darwin's theories.
A herd of buffalo can only move as fast as the slowest buffalo. When the herd is hunted, the slowest and the weakest ones at the back are killed first. This natural selection is good for the herd as a whole, because the speed and health of the group keeps improving from the regular killing of the weakest members.
In a similar way, the human brain can only operate as fast as the slowest brain cells. Now, it's already proven that excessive intake of alcohol kills brain cells, and naturally it attacks the slowest and weakest brain cells first.
Therefore, regular consumption of beer eliminates the weaker brain cells, making the whole brain a faster and more efficient machine. This is why you always feel smarter after drinking a few beers. 🍺🍺
@John: Never heard this one, but sounds absolutely logical to me! I have to keep it in mind for future discussions ;-)
Love your videos. Educational, practical, concise, perfectly structured, with subtle humour woven into the fabric.
Thanks. Glad you enjoy them!
I have been using the A111 from acconeer for some projects ( measure foiling height of a racing solar boat ). Fun to use and if you pick the right development board also very affordable. One could even use plastic lenses to change the opening angle vs distance .
Interesting. The datasheet says: Range 2m. What is your experience?
Beer is much better than water. And Rivella is much better than water too. Oh, I miss Switzerland! I'm coming back to Graubunden right after the pandemic. -Frank
Beer and Rivella: True.
And we hope we can travel to other countries ;-)
@@AndreasSpiess please let me invite you to Silicon Valley. I would be glad to introduce you to my friends and host you for a great meal. Or meet me in Shenzhen, the Disneyland of Chinese cities! I plan to go back there for my Esp32 wristwatch project once the pandemic is better here.
Thank you for the invitation! I plan to come to the next Hackaday Supercon whenever it is. And I also plan to go to Shenzen to visit a few companies I work with. So we have three possibilities to meet: US, Switzerland, or China ;-)
@@AndreasSpiess Marvelous. I am Frank Cohen, fcohen@votsh.com, I am working on an ESP32 Internet connected wrist watch to display home videos of my kids on my wrist. My previous maker project: startlingwatch.com. Seems to me there is a gap when working with ESP and Arduino projects that need to connect to a Cloud service. I'm intending to fill the gap with github.com/frankcohen/ReflectionsOS. Please send me an email and I will send you my details. Merci.
I love your Chanel. Thank you for inspiring a new generation of makers.
Glad you like it! So it is worth the time I invest.
One nice thing about the RCWL-0516 I just found out is, that you can use Pin 5 to get the direct analog signal and write your own detection algorithm. Especially useful if a esp8266 etc. generates false positives on the circuit.
You can use the analog signal even for sleep tracking...
Btw nice video, as always :)
You are right, you get the analog signal on a BISS pin. I never looked in the false positives. It seems they are reported with Wi-Fi modules. According my video the sensors work around 3GHz and Wi-Fi is at 2.4GHz. So the false alarms most probably come from the Wi-Fi signals. So a good algorithm could be to switch WiFi only on after an alarm is triggered.
@@AndreasSpiess Thanks for the clarification.
For my purpose the disabled Wifi was not an option because I wanted to implement a presents detection over multiple rooms to turn on and off the light accordingly (as fast as possible). With the one analog pin on the nodemcu and some threshold fine tuning it now works pretty well :)
Good to know, thanks! I had already written off the RCWL-0516 for my project. So I can just connect the pin labelled CDS to an ADC on my ESP? Or did you mean pin 5 on the IC?
@@EatRawGarlic The IC pin. On the BISS0001 (very similar to the one used on the RCWL-0516) it is labeled "2OUT" pin. So you have to solder a bit ;)
(It is actually the pin 12 in the datasheet. They start counting at the bottom left in a counter clockwise direction).
@@AndreasSpiess or 5G, depends however on if the lower part of the n77/78 spectrum is used. I guess these modules have a pretty wide detection range.
Are you going out again for drinking??
No, I just want to appear on the radar
Exactly! Always innovation on this channel ;-)
The beer does help - if you have several - then the problems just go away!
Your videos are always inspirational
Thank you!
Radar is a very interesting subject, I enjoyed this video for my Sunday tech fix, ie brain stimulus.
This video had me reminded of some badly engineered radar systems which had recorded nearby buildings doing over 100 kilometers per hour, that was quite some time ago that I read that somewhere.
The story still makes me smile.
Modern radar where they look at the phase angles of the reflected waves is amazing, resolving one wave length at those frequencies to within a few degrees is precision stuff.
With triangulation one can position stuff and monitor movement with precision.
Anyhow, rambling on, but it's so interesting.
Thanks for the video, have lovely Sunday further.
Kind regards,
South Africa
Yes, technology moves fast in the direction of more precision and higher speeds. Cars use already 70GHz radars which seem to have ranges of a few 100 meters.
The small range finders also work with phase shift detection, BTW and are also very precise.
I bought a TFMini lidar module when you showed it in your LIDAR video. It reached 15 m range with 1 cm accuracy, outdoors, with strong sunlight (the target was 1.5 m, white). It seems better compared to the radar sensor. Also it works indoors and was cheaper, around 40$. A good buy.
Truely a good buy! Thank you for sharing your experience.
Who needs a Swiss knife when you have Andreas in your life !! Danke von Kanada meine freund !
Thank you! Greetings back to Canada.
That sounds like a justification for a couple of extra beers!! 🍻
Good idea! Now it gets warmer here. Seems to be perfect timing.
Thank you very informative. Short and to the point thank you for not adding unnecessary commentary.
Thank you. The comment about the beer was probably not absolutely necessary ;-)
Excellent, this was helpful. I never could get the RCWL modules to work, my understanding of them was wrong. But now I have two CDM324's, this should be fun. Your old stuff is still good and interesting. Cool.
Thank you!
Maybe one beer wasn't enough, or the alcohol level was too low 🤣 Great video 👍
Well possible. Maybe I have to increase the dose for the next experiment ;-)
Great video. Comment, pir vs radar. In alarm systems radar based detect best targets moving towards or away from sensor. Pir is detecting movement crossing sideways. Pir works like a 1 point temperature meter. The fresnel lens in front creates small areas in the view field. So that hot object moving across will induce big changes. Without the lense it would only measure average heat on area, and not notice movement inside area. Still would notice big heat entering the meter area.
Thank you for your additional information!
Thanks for this great vid and overview! I just had to retire my CDM324 which I used as a raindrop sensor. After several years in service it started to produce a lot of false positive. I have to investigate the root cause.
In my drawer still sits a RSM2650 with quadrature output. I will see how to continue.
As PIR sensors, the aquara zigbee motion sensors are interesting. They are very small and contain also kind of luxmeter. So, they are easy to hide and to integrate in a room.
This is the "expensive CDM324" I mentioned. I also should have one in the drawer but never used it. I bought it for our bicycle project.
Concerning the aquara zigbee sensors: I have two of them in my lab and they work very good
Hello Andreas, thanks for the great video as usual. It is very informative and gives a good overview over radar sensors. By the way it is also possible to use an FSK modulation to measure the distance to moving objects. This makes it easier to filter out the environment in comparison to an FMCW distance measurement. Further the accuracy is better in comparison to FMCW because with FMCW the distance resolution is limited by the allowed usable bandwidth what is 200MHz at 24GHz. This gives a distance resolution of only 75cm for FMCW in the 24GHz band. With FSK it is possible to reach a much better resolution down to app. 5cm or even more. The K-LD7 from the company RFbeam located in Switzerland uses this modulation to measure the distance of moving objects. It is fully digital and has already a powerful FFT signal processing included.
Thank you for the info. I did not know about FSK in this application. Reading the documents, it seems, FSK only measures distance for moving targets. Is this true?
The module is interesting. I will try to get one for some tests. If it really detects cars at 30m, it would be very good.
@@AndreasSpiess Hello Andreas. Yes with FSK you can only detect moving objects and no static ones. With FSK it is only possible to separate objects over their speed and direction and not over distance in comparison to FMCW. This means that if you move the sensor itself all static objects will become moving objects with the same speed and you can separate them only over the direction -> For example if you are moving forward and pointing behind you all static objects will become moving objects with a negative speed and if a car or something is driving towards you it will have a positive speed. Because you can separate the objects over the direction it is possible to filter out the so called clutter to only detect the car (simple blind spot detection). With maximum sensitivity it is even possible to detect cars up to 50m as long as you work with the RAW target list and not the tracked one. RFbeam has also a simple Doppler movement detector and speed measurement sensor in its portfolio what is cheaper and has a better sensitivity (K-LD2).
I'm thinking perhaps one beer just wasn't enough to get the results you were anticipating. I'd go for 3 to 9 beers and recheck the results. If that doesn't work then drink 3 more and turn on some good music and relax for a while. Also the shoes looked fine to me. If anyone complains. They can buy you some Hoka running shoes and resolve that problem. As always good video. .
Thank you for your wise advice ;-)
Thanks for your sunday morning update on sensors, as always very informative. However you may want to mention that you're a guy with a Swiss GERMAN accent, as other parts of Switzerland do have their own funny English accent 😉
You are right. But those details are probably more important for us than for guys which confuse us with Sweden ;-)
Hi Andreas. Hope you are doing well. I read that you asked people not to email you and so I'll ask you here. My dad is turning 70 this friday, the 16th and you are his favorite youtuber. He is a doctor (nephrologist), but recently (about seven years ago) he discovered a big interest in electronics and programming. It really makes my heart melt to see him excited when receives the notification that you have uploaded a new video, when he explains something that he learnt from you or he says your catch phrase "the guy with the Swiss accent". He also buys the gadgets you suggest through your links. Well, I am meaning to ask you if you could wish him an happy birthday. Not even through a video or anything complicated. A simple message would surprise him a lot. With covid, we have just been reaching out to the rest of the family and his friends to gather some messages and I'm sure it would mean the world to him, to see something from you in addition. Thank you so very much for your time and attention and hopefully you'll see this in time. :) Carolina
Contact me on Twitter or Facebook messenger. We will see what we can do... you find the Links in the description.
@@AndreasSpiess I really appreciate it! I contacted you on facebook messenger :) !
Your videos are fantastic!! :D
Glad you like them!
An advantage of radar over PIR is that it will continue to work when ambient temperature is close to human body temperature.
I discovered this in the heat of last summer, when our outside pir sensors stopped working, becoming blind to body heat, even during the middle of the night.
True. This is what I meant in my table with the last column. But you explained it better than me.
Thanks for this very nice video!
Knowledge combined with humor, top mixture!
Glad you enjoyed it!
I wear exactly the same shoes watching this video!
Boy reading comments before the entire video is funny.
I like them. But it seems they also have haters...
I had this gun thing intended for golf, which could tell speed over really long distances as well as measure long distances. It used laser, but no laser was visible.
I no longer have it, and I never really worked out how it worked so well. It worked in daylight up to 400m!
Honestly it scared me because I kept looking into the wrong side and feared I would injure my eye :)
I once made a video about a probably similar device. It was able to measure distances to 1500 meters in daylight if I remember right.
But it is interesting that yours worked with a flying golf ball! A very small target.
@@AndreasSpiess oh no, I don't play golf. I was measuring car speeds. I don't think it would work with a golf ball :)
Aha. Mine was also able to measure speed of cars. This seems to be quite "normal" these days. But it is definitively good not to look into the beam...
Great video as always 👍😀
Thanks for sharing your experience with all of us👍😀
Glad you liked it! And thank you for your continued support!
Hi Andreas, thank you, you are great. Now I understand what it takes to measure presence, speed, distance and direction. The only thing I don't understand is how multi-target detection works.
They evaluate the reflected signal and see several peaks.
Excellent mime act at 2:40. A strong 7/10.
:-) I will tell him.
Mandatory comment about the shoes ;)
If not about shoes - what should we debate about ?
:-)
Love this video, like your other videos you are a wealth of information! Thank you so much Andreas!
My pleasure! I hope everything is ok on your side.
Crocs with socks most comfortable shoes hands down.
:-)
Very useful in 11:16 ,sensor table for right chose.
Glad it is helpful!
FMCW is not new. In the late 70's it was called chirp-FM radar (because the short FM sweep sounds like the chirp a bird makes). I know, it was part of my Master's thesis. The problem back then was the you needed to do the Fourier Transform to get the range to the target. The computers that could do back then were to big and heavy to fit on aircraft. My thesis was on an alternative technique that used hardware (multipliers and a CCD transversal filter) to do the Fourier Transform. I recall that one of the problem I had was the the frequency difference introduced by return response delay (caused by the range to target) was very similar in frequency to the doppler shift. This became an major problem when the transceiver was on something that was moving (like an airplane). The ground was usually much closer than the target so the return response from the ground would be doppler shifted and much stronger than the response from the target. I suspect that narrowing the beam using something like a phased array and/or fancy processing (like comparing the response time) could help discriminate between the two now.
You are right. Most of the basic technologies are old. What is mindboggling is how cheap we can build them today. We did the FFT with an ESP32 and it was faster than needed ( we only wanted to detect 25km/h, not airplanes ;-)
I would assume that the doppler effect is constant over a few chirps and therefore probably can be eliminated. But I am not an expert like you. My thesis was to increase the listening speed for news without increasing the frequency. Also a feature which is built-in in today's smartphones...
I was playing around with the little cheap radar devices with the goal of building another tool for ny daughter and niece who play at ghost busting. I am afraid I must, however take a break as I recently found that the pain in my back is not from the injury that has been paining me for over 20 years but a cancer tumor larger then a grapefruit on my right kidney. It must be removed as soon as the doctors can schedule the surgery, in early December, they say now. So I may well be out of it for some time, I am in hopes that this is the only cancer they find when they operate, they believe it is, so this is a good sign they tell me. I look forward to more projects when the healing is over and I can get back into electronics. So until then, please keep me in mind. Thanks
Bad luck! I hope that all will go well with your surgery, and you are ok till Christmas with your family!
Muy bueno!! Muchas gracias!(from Spain)
You are welcome!
I see DM-19 doppler speed sensor going for under 50$ in aliexpress. 25 m max. range for vehicles and measuring up to 150 kmh. There is also DM-20 sensor with 40 m vehicle range but cost is 120$. I have many times thought about constructing some kind of car mounted sensor that would tell me the speed difference between me and the car driving in front. I could then use this speed difference information to adjust the non-adaptive cruise control to match.
Did you check it out? Does it work on the long distance? For me, the chip is tiny for the power it should produce.
Automotive FMCW radars use a fast series of different frequency gradients. By comparing different frequency gradients you can measure speed and distance. In addition they have usually several antennas and can detect also the direction of the signal without any moving parts.
Sounds like great devices! I assume they are quite expensive for now. But maybe in a few years we can get them cheaper.
@@AndreasSpiess I'm not allowed to tell you exact prices. The complete sensor including an ECU that evaluates the sgnals and doing all things like calculateing if an autonmous braking is needed is definetly below 100€ of hardware costs. What I observe is that the next sensor generations become significantly better but not necessarely much cheaper. It seems that classical FMCW isn't used for actual/next sensor generations. They use a method called "chirp sequence".
Thank you for your information. I can imagine they use newer technology. Also phased arrays seem to be used to get some directional information.
Maybe we will get them from old cars in a few years ...
Hi Andreas,
what happened to the "Episode #number" in title ? Episode #370 was the last to have the number in the title.
The last 10 episodes never have numbers...
Nice video and a very good explaination. But how about your shoes? 😄
:-))
In addition to the mentioned frequencies, there are some sensors that operate in the 2.4 GHz ISM band. Automotive radar often uses 77 or 79 GHz.
So far I never saw 2.4GHz sensors. So good to know. 60, 77 and 79GHz seem to be common these days in the car industry. And I saw that they sell collision avoidance radars with 150m range for less than 50 dollars. Now we just have to hack them...
@@AndreasSpiess I bought a Siemens KMY24 about 20 yrs ago to play around with doppler radar. It works at 2.45 GHz.
Very interesting. I was hoping you'd eventually have more luck in measuring the speed of cars. It almost seems like it might be better to just buy a $99 bushnell and interface with it using an arduino
True. I once had a laser range finder but did not find a way to interface it to an Arduino
@@AndreasSpiess there's another guy on CZcams who worked out how to interface with the Bushnell Velocity speed gun using an Arduino.
I'm probably going to try do the same thing, but with an ESP32
Gracias por los subtítulos en español. Your videos are really very high tech. I like it.
Thank you! And I will tell Luciana, the Argentinean translator that you like her subtitles.
I didn’t read the previous comments about your shoes but I am assuming your fans highlighted how fit for purpose they are, thanks for a very informative video.🙂
You are welcome! There were different opinions about my shoes ;-)
Great tutorial. Did you look at new 60 GHz chips? From Acconeer, XM122? pulse coherent radar, and Infineon doppler, aim to compete with PIR so very cheap in quantity but hard to integrate, short range unless use dielectric lenses, very low power.
Interesting technology. So far I did not look at it. I am more interested in the longer range sensors. But it seems that the development towards highest frequencies is fast. So I will have an eye on it.
Hi Andreas, thanks for the great video. I love your know how! Thanks Andreas 😘😘😘😘😘😘😘😘
My pleasure!
Thank you for your effort and work on this topic! I’m looking for a sensor that I can use to track golf shots! So it has to accurately find a small object , preferably also detect the golf club and it’s Speed, and Launch angle of the Golf Ball. As well as speed.
Sorry I clicked post too quick! Any information you have would be greatly appreciated !
You have to go to the golf pages. There they sell golf trainers which measure all the club movements. I am not sure if you also can get a device to track the ball.
The SMR-3x3 (333/313, etc) series sensors from InnoSent not only measure speed, but also distance, direction and have various angles of detection and are half inch size and are under $20
Interesting module. I did not find the range. Do you know?
I suspect your beer test results were due to insufficient quantity. Suggest retesting using quantities 2-10. To avoid the negative brain attenuation that could occurring while testing, your may need a human helper or some other walk-assist device to complete the test procedure.
:-))
This is really useful…… Brilliant as usual
Thank you!
Thanks. Useful material.
Glad you think so!
i like the spanish captions
Thank you. Luciana from Argentina does them
Your contenet are very awesome!!
Thank you!
I found that Seeed now has various 24 and 60 radar. Some of them can remotely measure breathing and heart frequency. Some have fall detection and other distinguish between active and non mobile presence (like someone sleeping).
Maybe this could be interesting to re-visit the topic.
I Agree there is more to test in the future.
@@AndreasSpiess i hope you revisit this topic, very cool tech.
Hi, I want to use a CDM324 to detect the presence of people in a room like the DFRobot mmWave Presence Detection Sensor does, so I'm not intrested in messuring speed at all. What would I have to change on the circuit around the sensor to just detect presence of humans?
Maybe you watch my today's video?
Best Professor!
Wow, thanks!
10:29 Andreas Stealth! :D
:-))
Hello,
I appreciate your video; it was very useful. I also have a question about the sensor's sensing angle. I read that this sensor doesn't have a blind spot, but I want to reduce the sensing angle. I don't need it to sense 360 degrees, just between 100 to 180 degrees.
Is it possible to reduce the sensing angle of the RCWL-0516 sensor? Alternatively, can you suggest some common materials that absorb microwaves and don't affect the waves?
thank you
Maybe you watch my video on the newer 24GHz radar sensors?
I need your help with some issue, I want to measure the clothes wet/dry using a microwave sensor just thinking about how to brake any sensor famous in the market to sender and receiver and I put the clothes in between
These sensors use integrated chips with transmitters and receivers. I do not think you get the field strength out of them because this is not needed for their typical application.
Great video and great overview. However for me the price is also relevant and, as mentioned in the video, there are huge differences.
Good point! The price range is huge between the cheap presence detectors and a long range radar device.
your shoes are amazing!
:-)
Nice shoes, I have the same pair. Very comfortable.
Yes they are!
Thanks! It is interesting to know that the Aliexpress website and probably most similar websites only sell consumer products. When asked, Aliexpress said that to buy using a company, you must register as a Dropshipper, that is, you will only pass the product on to the consumer, there is no way for a company to buy for use on these websites, which is ridiculous.
I do not know their business processes. I only purchase as an end-consumer...
Andreas, your radar sensor series inspired me to build a detector to know when my cat is at the door, and want to come in. Problem is that it works to good. I mounted the sensor inside a bean can and then placed it tightly mounted on the wall with the opening of the can facing outside direction, i was thinking it would make it directional and that no reflection could interfere, but no, still detecting me pasing from behind. Is the metal can now acting as an antenna? Any idea how to fix this? maybe a video?
As I mentioned: The cheap presence detectors are receivers and are very omnidirectional. I never experimented with them. Connecting the can to the ground pin is the only idea I would have.
@@AndreasSpiess Brilliant idea! It worked :-) Thank you so much Andreas. Happy easter to you and your family.
I have been looking for a true directional sensor that I can stand behind without triggering it. Have you found anything capable?
I never had this need, so I do not know.
@@AndreasSpiess thanks for the response. My hunt goes on.
nice video, but one question, shouldn't be received and transmitted signal graphs named another way around, in FMCW section, cause i think received signal is the one which is late on time axis which should be in front transmitted signal. thank you
The received signal arrives a bit after the transmitted signal. Maybe I made a mistake.
Not influenced by light well this would have become stupid me hand a few years ago :), when I was trying to detect of the blinds are closed with an infra-red sensor, forgetting that sunlight has also infra-red.
The sensor was always triggered :).
I still have the sensor but recently unsoldered everything.
One day I will take a go at it again, now knowing more about sensors and considering using libraries and datasheet :D.
IR remote controls use modulated IR (38kHz). Because sunlight is stable it is easy to distinguish between them. You even get IR diodes with 38kHz filters built in for cheap. I once made a video about it if I remember right.
I have somewhere in my notes that you have reviewed the HFS-DC06 presence detector radar sensors before, which operate on 5.8GHz ISM.
You didn't mention it again? Or did you referene it under a different name? I am confused 😅
This sensor uses the same principle as the rcwl-0516 and it was covered in this video. I did not remember that it works on a different frequency. So I forgot to mention it in this video :-(
Hi
thank you for efforts and the information.
I have made a project to my daughter with microwave motion sensor to detect human behind a wall ,working well, but is there anyway to measure the distance for the human movement from the wall.
Appreciate ideas.
These sensors should give you distance information.
Can anyone suggest the Lidar sensor for project purpose
Why is the FM24 indoors in brackets? I am looking for a good sensor to do home automations :)
As said in the video: Because of reflections.
An easy trick with the CDM320 / HB100 to know direction of movement and looking at the VOUT amplitude with time: if going up it's likely that the object is moving towards you, and vice versa
You are right. This is what we tried to do in our bicycle detector. But it was not as easy as we thought...
@@AndreasSpiess FYI I'm the guy behind limpkin.fr... I have a new board on my desk with a new amplification chain and a stm32 to do an FFT on a CDM324 amplified output :)
Cool! Your page is very good. Where do I find the info about this board? This looks very interesting! What is the range you get?
Maybe you send me a message to exchange the email addresses? BTW: I was not aware that you live in Switzerland...
@@AndreasSpiess I'll publish it all on github the moment I can check it actually works! I can send you one prototype if you'd like... I'll send you a message then!
@@AndreasSpiess Nearly 2 years ago... i finally finished it! want me to send you one?
Maybe more IPA testing cycles are needed to get more significant and reliable data....😝
True. Summer is coming and I have to retry the experiment ;-)
hi Andreas, thanks for the video, do you think is possible to scrape off the copper part that connects the transmitter and receiver of the FM24-NP100 module at small antenna, solder an sma connector and attach a more gain MIMO antenna to it to increase the mesurement distance, I could also opt for a small power amplifier to increase transmittin power by a few milliwatts, let's give 3 or 4mw, the point is that I need 70 meters for my project.
having said that, do you think it can be done or is the limitation of the distance is a problem more related to the difference in measurable frequency than to the power?
Thanks in advance
These are very short wavelength and antennas are difficult to build. I would not try it myself. The whole setup of those sensors are not made for long range. Look at the long range sensors. Their antennas are much bigger and they use much more power. And they are very expensive :-(
@@AndreasSpiess hello andreas, thanks for the reply, I searched a bit on the net, and yes,they are actually expensive, you wouldn't have any links of the cheapest you could find, thanks again
I am not in such high frequencies (yet)...
Considered putting the sensor on an oscillating stepper or servo and trying to map the environment? Might also give a better idea of the directional characteristics. Have another beer or two. That will make it work, for sure.
Another viewer found the reading frequency of the distance radar: 10 Hz. Probably a little slow, but it would be cool to have an "air traffic radar" at home...
@@AndreasSpiess especially with all the drones zooming around inside the house.... DUCK!
Hello Andreas! Thanks for the great video! I am also interested in radar technology and would like to clarify that there are radar sensors that can measure the vital signs of people, such as pulse and respiration.
You are right, there are many applications of this useful technology.
As always, the best channel I subscribe to and I’ll drink to that!
Thank you and Cheers!
@@AndreasSpiess do you have any plans to use BLE beacons to send data to MCU’s? I am attempting such a project with the Ruuvi tag
So far I have no such plans. You can buy such beacons for no money.
Why can't you calculate the speed of an object using a distance radar at two different timesteps in the same way that you do with the LIDAR?
Most simple radars cannot measure distance. They can measure speed using the Doppler effect
Necesito algo que detecte movimiento detras de la pared
If your walls move, correct.
Oh those cheap RCWL sensors don't contain a transmitter? I honestly am very confused with that for years, I always thought they also work on some kind of doppler effect.
As you see in the diagram they only contain one active element. The BIS00001 has nothing to do with the radar frequencies.
@@AndreasSpiess Its basically a large range capacitive detection sensor then?
It is a resonator which is influenced by the environment. It is well possible that it the effect is capacitive, But I am no specialist in regenerative receivers. I just tell things I read.
Hello Mr Andreas Spiess,
i am looking now for some time for an alternative for the common rainsensors that work by water conducting on a plated board. But there is problems with corrosion and these sensors are not very precise when it goes to tell when it _stopped_ to rain because water stays on them for some time. Would these Radar Sensors be an alternative to that? I have looked up a lot and could only find very expensive equipment for professional meteorologists. Maybe you have an idea.
My rain sensor works mechanically. And I know that some Makers experimented with radar. ( github.com/chunter1/precipitationSensorESP32 )
I want to make a fast rotating Ka band radar detector with a super high polling rate so I can have really accurate 360 degree direction finding compared to the radar detectors on the market today that only have front or rear direction finding.
Interesting project!
11:06 Nice shoes
:-))
I have a question
...could this doppler sensor, be used to detect infrared emitters pointed out towards it ?
Thanks, i hope to have asked correctly
Infrared is light and these radars use a completely different frequency. So they do not "see" each-other
Nice shoes
:-)
Slow sounds cool
:-)
Ooh, we finally get reasonably cheap FMCW radars for hobby projects!
The UART on the FM24-NP100 sensor has an Rx pin. The factory manual says it's reserved. Maybe it could be used for modifying settings like radar power or update frequency?
I did not find any information on the input specs. But maybe I did not dig long enough.
@@AndreasSpiess I also did not dig past the manual. In fact, I hadn't found much information about it at all. Google gives me various links to shops selling it and not a single Github or other DIY project. I am thinking about contacting the manufacturer for some info.
There are 30-40 tons of olive oil tanks between 6 - 10 meters. Here the tanks are in the domestic environment. It is at a fixed temperature at an average of 20 degrees. The level is wanted to be measured here. You think it makes sense to use ultrasonic, ridar or lidar. Or let me ask. Considering contamination or price performance in the environment, will the choice change?
6-10 meters is not easy with ultrasonic or standard Lidar because your sensor usually sits maybe 2 meters above. So you need a range of 12m.
I made a video about this topic where you find other possibilities.
Can the FM24-NP100 calculate speed based on distance (like LIDAR)?
You should be able to do that in software.
We can’t use lidar in outdoors !? , I have long range lidar 120m , I am using it in my uav for obstacle avoidance
Then you are lucky. In bright sunlight some Lidars had issues when I tried them. But I also had one which worked 1500 meters.
Greetings and thank you very much for this video.
I have a question, I would like to measure the movement of a piano key, it is a very short distance in the order of mm, what sensors could I consider taking into account an accuracy/price ratio?
Thank u so much in advance!
I do not know what parameters you want to measure. Just contact. Or speed? I would search for similar DIY projects.
@@AndreasSpiess Thank you very much for your reply. I would like to measure the speed. They use a CNY70 in this project, and I was wondering if you can think of any sensors that might work better. czcams.com/video/PLwpEU9NLPA/video.html&ab_channel=CyberGene
Maybe you have a look at the VL6180X. It has only a range up to 10cm.
1:35 actually, this depends. The AirTag for example uses frequencies above 7 GHz as far as I’m aware, but the power must be strictly limited, usually to -35 - 0dBm @ 50 MHz bandwidth.
At least the BNetzA states power limits for UWB, but it‘s not in the ISM section. I wonder if the 3 GHz ones will cause trouble with 5G n78.
UWB is a very different topic because its bandwidth is extremely big (GHz) and it includes bands that are used by other services. With the coin cell of an Airtag you are not capable to bridge more than a few meters. So no big problem in my opinion.
It would be helpful to have a video for visualizing this data and, very importantly, how to use multiple radar sensors for triangulation, etc. I need to record the data from objects moving over time in a very visible way.
So you have a great project! I have no such needs...
Great video!
Which one would YOU use for a driveway sensor to detect cars/humans walking up a long driveway surrounded be trees?
You can try a couple of the first category. But people report false alarms with ESP boards in their vicinity. Maybe the HB100 with electronics could be a choice. But I never tested its range.
@@AndreasSpiess I had some luck separating the ESP and the sensor. I wire a 3.5 mm audio socket into my enclosure and connect the IO pin and power to that. I have a matching socket on the enclosure for the sensor and they connect together with a standard 3.5 mm M to M cable. I also include a capacitor in the box with the sensor to level out power issues.In this way I can swap out sensors easily. Just make sure to power off the device prior to plugging or unplugging the sensor or cables.
8:43 Only with stationary objects. Moving objects cause a change in frequency because of the Doppler effect.
How much does that influence the outcome?
You are right. I do not know how big the influence is because I do not know the rate of the frequency change.
Very useful video, thanks! Particularly the comparison chart of the various sensors. For the project I want to do, though, I need to connect an esp32 to a sensor that will trigger within a few milliseconds (5 max), so I can calculate speed, using either one or two sensors (with a distance to 10cm, or so, apart). So far, I haven't found anywhere that shows this information and I wondered if you had come across it in your research.
Ideally it would be directional and cheap. The RCWL-0516, HB100 and the CDM324 seem the obvious candidates but all of the sensors I have tried so far seem to have a sampling rate or refresh rate, which means that they cab be too slow to react to an object passing the sensor. most recently, I tried the GP2Y0A21YK0F but, again, it was too slow.
Any suggestions? 🤔
These sensors are not precise enough for this purpose. You either use the CDM324 to directly measure speed (I once made a video), or you use IR sensors to measure time between two points.
Thanks - I have been looking into the CDM324 but I think the IR sensors are too prone to light fluctuations for reliable use.@@AndreasSpiess
@@connalmcilwraith4367 Watch my IR video...
Hello Mr Spiess,
Nice video.
I have a question please.
I wish to protect my fruit trees from air borne and ground attack animals at a distance over a wide area without great expense or use of poisons.
PRS radar will do this I beleive.
Question can your device upgrade to become a transceiver at 5 watts rf ,fmcw - pulse doppler FMCW with high power - low power mode .
The anntena could use your aerials, linked together maybe in a stacked array that is swr stable increasing radar abilities .
I guess the alarm output could be a tone or a strobe at the unit.
Programing the device would be I bit tricky.
Probably not you normal question Mr Speiss
Thanks for your shows.
Andrew Nz
These sensors do not have a long range and it cannot be increased. You have to buy the expensive stuff if you need more :-(
Do you know of a sensor that detects non-moving presence such as the mmWave sensor in the Aqara FP1? I’d like to build something similar to this so I can detect presence of non-moving humans in a room. Very useful for the living room as people may be present but watching TV and not moving. Cheers 😊
It detects conducting material like water.
Any guess what module Garmin might use for their Varia RTL516? The range is quite impressive. I tried to build a similar car approximation detector with a LIDAR Light v3, however this seems to be limited to 40m only.
I also wonder how they get the 150m. Maybe I should buy one…
Very interesting georadar the theme
Unfortunately, I do not understand what you mean
@@AndreasSpiess it would be interesting to build a georadar based on such sensors
Aha. I do not know how much power these devices need because they have to penetrate material. Maybe these sensors are not powerful enough.