you weren't getting crazy readings they were normal because carbon monoxide contains hydrogen! Why do you think CO is flammable? Because CO contains hydrogen! The formula should be HCO or CHO or COH even!
@@PeterPete what the heck is this nonsense Since when does everything that is flammable contain hydrogen? CO is flammable because it’s not fully combusted
Some CO detectors have a "secret" serial port in them that can be used to log output data directly to your computer. Developers use the port during the manufacturing process for testing. Mine had the four required 3.3v, RX, TX, and GND pads so I used a MAX232 based level shifter and USB serial port cable, opened up a terminal program and sure enough the detector fed out the detected CO level to my laptop every second!
same thing with toasters. while not quite as useful, you can use the lever as a keyboard button. i saw a video of a guy doing just that. he had an array of toasters and played doom with them, albeit inefficiently.
This is a well known cross sensitivity in the industry and can lead to quite funny moments. In Germany all paramedics have to wear a CO sensor due to several accidents when entering Apartments (suicide by CO and the paramedics being the first to enter). The devices are usually worn at the belt. Hydrogen can also be produced in your digestive tract resulting in (very loud) false alarms shortly after a a good fart. (Hydrogen is produced for example by lactose intolerant if they digest lactose).
I work in the gas detection industry and CO / H2 cross sensitivity is a HUGE issue in the manufacturing industry, especially steel works where the CO alarms go off due to miniscule H2 leaks.
Interesting video. A hack you can do with old smoke detectors is to use them to detect moisture. This can be used to detect accidental spills or leaks, such as around your water heater or under your sink. Take the two sides of the "Push to Test" button wires or contacts and extend them to outside the unit. If these wires are in contact with a wet surface the alarm will activate. I wrap the bare copper wires around a small 2 cm or 1" piece of gypsum drywall, with a slight separation between the wires. If the drywall becomes moist the resistance drops below 1 meg ohm and the alarm activates. I use a DC wall wart with a voltage regulator to feed mine, but a normal 9 volt battery will also work. The unit may still detect fires, but use a regular unit for this.
True, it may be different from the old ones I've used. It's easy enough to test the unit before making any mods to it. The six I've modified all work fine. I should get off my duff and make a video and post it ;-)
It's well known that CO detectors are cross sensitive to H2 gas. I have experienced it myself with my personal gas detector which I have for work, it is a quad sensor detector which detects H2S, CO, O2 and LEL%. The detector can go off when you are near a charging station for forklift trucks for example. The lead acid charging cycle releases H2.
Hey NurdRage, Idea: industrial adhesives. The two applications I've been curious about are how copper is attached to fiber glass to make PCB's (raw copper clad), and how automotive clutch and brake pad compounds are attached to metal backing plates. Honestly I'd love to hear a chemist's take on adhesives in general from weakest to strongest and your general perspective on use and classification. Perhaps even a bit of info on the bleeding edge type stuff most of us are clueless about. Have a great day, -Jake
I work at a golf course and in the equipment building we store around 40 electric carts. One year in an attempt to keep me from being killed by Carbon Monoxide (work as a mechanic in the building). The higher ups decided to install a detector. It started going off in the middle of the night from the Hydrogen created when the electric carts are charging.
I can personally attest this not only works but is extremely useful when lead acid batteries are present in a "confined" space. Invaluable even. Didn't find out about it here (accidental discovery) but I'm certainly glad someone covered it.
I had flooded lead acid batteries in an off grid solar power system and they were setting off my carbon monoxide alarm and I had no idea why. The problem went away when I switched to lithium ion.
Shaun Dobbie You were overchargin them. Lead acid generated hydrogen when overcharged. 13,6v is the maximun for lead acid. You can do 14,2v if you are using it as its charged but for stand by 13,6v at 25*C is the max. It greately changes with temperature so check that.
These flooded batteries need the higher voltage or they will not charge properly. I charged them as advised by the manufacturer and even then they can still give off some gas. They were inside a small shed so not much space for the gas to dissipate.
The overcharging is puposely used to create those bubbles in order to mix the solution. Not doing that would decrease the lifespan of the batteries because u get higher acid levels in the lower part of the battery. There are also systems that pump air through the batteries to do that which is even better for the lifetime.
Question: carbon monoxide detectors should be placed near the floor because CO is heavier than air. Propane is also heavier than air. But most "natural gas" is methane, which is lighter than air. Should you place this combination sensor near the ceiling or near the floor?
Just recently I tried to detect CO in my hydrogen product stream with such a thing. The test gas we ordered for our gas chromatography was taking months and I wondered, if such a thing could give me a rough estimate of the concentration in the lower ppm area. Then I found out about the cross sensitivity the loud way :D
Our calibrated combustible gas sensors got fooled once by this effect. I worked for a propane company, we got a call about a CO leak in a home. The FD came and vented the house so I was called to find the source. The appliances had been off for a couple hours by the time I got there. I got readings as soon as I walked into the house as if the gas burning appliances where still on. They had been off until I got there. I could not figure out what was going on! Then I noticed that the customer had a solar electrical system in the same room as the boiler I was testing. The recharging batteries were housed in a plywood box that had a crude flex vent to the outdoors. The readings coming out of the hole to the outdoor air were off the scale! It was hydrogen, it had to be, that's what the vent was for. I got on my phone and Googled this. Sure enough, I found some discussion about nuisance CO fire calls caused by a person who had a car battery being charged in the garage. It was setting off the CO alarm in the house.
There are some printed tech based CO sensors from SPEC that have quite low cross sensitivity to H2S. They also mention chemically selective filters being available. Of course these features would be well out of range of the low cost consumer CO detector, but the base sensor is quite reasonable (PN 110-109 is $20).
Probably should mention that H2 and CO are both lighter than air, which requires a high mount point. Some flammable gases are heavier than air, requiring a low mount point. I think it's better to get separate devices for them, or if they're cheap get two and mount one near the ceiling and the other near the floor.
This is important when you consider that hydrogen producing fuel cells for cars and other energy needs maybe coming in the future and they need for a hydrogen detecting equipment has not really been considered by that emerging market. And cars that use straight hydrogen gas of course need very quick accurate leak sensors.
This would seem to suggest hydrogen might not be a bad way to test one of these alarms. If you have an older alarm and want to know if it would still detect something, you could give it some hydrogen to test it - and as you have shown, hydrogen is cheap and easy to make. Probably simpler to buy a new unit if it is old, but interesting that it should work in theory. Making CO, on the other hand, is probably quite a bit trickier, and probably a bit risky too if you make a fair bit to set off your alarm.
A few months ago I had a smoke alarm (First Alert) give a false positive... and it just wouldn't shut up even after I moved it outside for a few hours. I've replaced it with a Kidde sensor. After reading a bit more, I've found that high relative humidity can trip the alarms. :\
NurdRage i have some questions but it is not related to the video, way out of subject. What makes a flammable? Is it the chemical structure? What difference do they have from other substances that makes them flammable? Hope my questions make sense. By the way, your channel kicks ass
Wow i though you were dead. I was just checking one of your old videos and seeing whan was the last time you uploaded i found like 5 videos i never got in the feed
check if you have notifications turned on for my channel. If you do and still aren't getting anything, submit a bug report to youtube to tell them to fix it.
the only reason the sensor detected hydrogen is that natural gas and CO contain hydrogen!! The sensor is merely a hydrogen detector and the layout of the sensor is very similar to a hydrogen fuel cell!
Cool ! Definitely going to go and get a detector and play with it. snowdaysrule2's discovery sounds like a great feature to have. You can definitely learn enough electronics to start tech-phreakin this stuff. (the round black piezo thing is the beeper)
hehehe, yeah, definitely trying to learn more electronics. As for doing it yourself. Do wear hearing protection, or even disconnect the alarm and just use the display. I suffered temporary tinnitus because i was doing it so long and it was so loud. Have fun :)
CO detectors also give false positives to solvent vapors. I learnt it after new gas detectors were installed in my Uni's labs and someone tried to clean something with isopropanol. Whole building evacuated, people in the monitored areas can't use any solvent outside of a fumehood anymore...
Considering that he was complaining about them being labelled as sensors specifically in the context of this device's schematic/circuit diagram, thier hypothetical other uses aren't really relevent. Labelling them as the sensor is just an error, plain and simple.
Will the combustible gas sensor also work for CO detection as well? I understand that it already contains a specific CO detector, but CO is a combustible gas too.
yes it does! (although they include the CO detector so that you can tell the difference and know if you should close the gas line, or turn off the furnace. Only knowing it could be either one doesn't tell you which problem to solve.)
You won't, since hydrogen is significantly less dense than air, so it will stick to the ceilling and unless you're tanking a Tesla battery into an indoor swimming pool, you shouldn't even come close the reaching that level.
I used to live in a predominantly Jewish community. Everyone carried one of these things around like it would ward against death for some obscure reason.
Really nice! I had always wonder how those alarms work, but never bother look it up. I expected the electronics to be quite simple (just detecting changing resistance, voltage or something like that) - but the sensors was the thing I was really wondering about, so thanks for that.
Technically speaking a piezoelectric disc is actually a sensor as well. It can generate a voltage (signal) in response to a physical interaction. It's a passive sensor, but no less a sensor than an LDR, or even an LED, which can be used to sense light, though not nearly as well as it emits.
That's kind of like saying the wires in the circuits are also sensors because they'll output a signal if you pass a strong magnetic flux through them. It's a device designed to detect combustible gasses and carbon monoxide, any utility of the components outside of that context is irrelevant, ESPECIALLY considering the sites he was talking about are supposed to be explanations of what the components are in this specific type of device. Labelling the speaker as a sensor on a schematic or circuit diagram isn't some oblique reference to hypothetical other uses, it's just wrong.
It wasn't labeled at all, he said that they're sometimes referred to as sensors but they're not, I corrected that. And yeah, technically speaking, if you're using the wires to sense that magnetic flux, then they're sensors. In a circuit designed to detect a knock on a hard surface, you mount a piezoelectric *sensor* to detect that vibration converted into electrical current. When you want to generate a tone, you use a piezoelectric buzzer. No matter what you call them though, they are piezoelectric transducers. A transducer converts physical interaction into electrical current, and vice versa. A thermocouple is a transducer, it detects a physical property (temperature) and converts it into a voltage. Another great example is a MEMS device. A device which uses mechanical components to detect physical stimuli and respond with an electrical signal, which is exactly what a piezoelectric transducer does. The big take away here is that what he said wasn't correct, and that's what I was disagreeing with. What you call it depends on the application, but it is a sensor as well as a "speaker". I was not arguing that it should be called a sensor *in this circuit*, but it wasn't labeled as such so I was purely disagreeing with NurdRage's comments on the subject.
What he said was "it's not in itself a sensor, although I see a lot of websites that inaccurately mislabel it as such." If he had just said "it's not *in this circuit* a sensor" and left off the part about them being mislabeled, he would have been right. It is a sensor, in a circuit where it's designed to be a sensor. It's also a "speaker", in circuits where it is designed as such. I'm not trying to be sideways dude, just trying to correct misinformation.
You're making my point for me. In this circuit, and any circuit relevant to this video, it's not included to detect vibration, just like wires aren't included to detect magnetic flux. Ergo, it's not a sensor. End of story. And you're not trying to clarify, you're being a pedant and muddling the issue for anyone who may not understand circuits or English well for no other reason than a smug sense of superiority.
The hydrogen sensor seems pretty cheap by itself: www.digikey.com/product-detail/en/sparkfun-electronics/SEN-10916/1568-1410-ND/6161752 Might be able to rip out the old sensor and drop this one in.
It should be noted that hydrolyzing distilled water (with a bit of table salt in it) is a lot safer, and doesn’t require any dangerous chemicals, but you will need a DC power source, wire, and carbon electrodes (get them from a #2 pencil). Hydrogen it still flammable, though, so no smoking during the experiment! :) You can also use a car battery, instead of a DC power supply. Depending on the voltage/current, you may have to wait a bit longer to build up enough hydrogen gas to set off the alarm.
NaCl and water mixture will produce chlorine unless you have low concentration of salt and high enough voltage. Oxygen production requires higher voltage than clorine
This scanner yeah truth because I went to titiwangsa malaysia hospital I saw the emotion so suspected, I trough that mafia did and others maybe police, its not funny im just in an circle
Well now that explains why I was getting crazy readings when I was trying to see if my hydrogen was contaminated with carbon monoxide.
you weren't getting crazy readings they were normal because carbon monoxide contains hydrogen! Why do you think CO is flammable? Because CO contains hydrogen! The formula should be HCO or CHO or COH even!
@@PeterPete what the heck is this nonsense
Since when does everything that is flammable contain hydrogen? CO is flammable because it’s not fully combusted
Some CO detectors have a "secret" serial port in them that can be used to log output data directly to your computer. Developers use the port during the manufacturing process for testing. Mine had the four required 3.3v, RX, TX, and GND pads so I used a MAX232 based level shifter and USB serial port cable, opened up a terminal program and sure enough the detector fed out the detected CO level to my laptop every second!
Interesting! that sounds like a cool project to try (if i can ever learn enough electronics to do it :)
If it was me, I'd start with J2. Looks kind of like a serial port to me
imgur.com/a/oVnOP
same thing with toasters. while not quite as useful, you can use the lever as a keyboard button. i saw a video of a guy doing just that. he had an array of toasters and played doom with them, albeit inefficiently.
Maybe "undocumented" is a better term than "secret" :)
Which sensor did you have?
This is a well known cross sensitivity in the industry and can lead to quite funny moments. In Germany all paramedics have to wear a CO sensor due to several accidents when entering Apartments (suicide by CO and the paramedics being the first to enter). The devices are usually worn at the belt. Hydrogen can also be produced in your digestive tract resulting in (very loud) false alarms shortly after a a good fart. (Hydrogen is produced for example by lactose intolerant if they digest lactose).
Your safety disclaimers are reaching the level of a high priced lawyer. Clearly a sign of success!
Did you knew that lighter flame smells like burning nose hair?
Sodium is odorless, and that was a joke! What wwwelkam is implying is he burnt his nose hair by sticking a lighter flame in it trying to smell it. :)
Quoverlord wow! thanks for explaining the joke. Would not have gotten it!!!
Not an April fools joke...
NurdRage You could get waaay more views by writing "Detecting hydrogen with a lighter" in the title.
Making such comment creates doubt
you should make a Aprils fool about mixing chlorine with ammonia to make Vape juice
This needs more likes, so the natural selection could occur.
Good,now I'll take a cup of nerds please
I work in the gas detection industry and CO / H2 cross sensitivity is a HUGE issue in the manufacturing industry, especially steel works where the CO alarms go off due to miniscule H2 leaks.
It wouldn't be a huge issue if people woke up and realised CO contains H2.
Interesting video. A hack you can do with old smoke detectors is to use them to detect moisture. This can be used to detect accidental spills or leaks, such as around your water heater or under your sink. Take the two sides of the "Push to Test" button wires or contacts and extend them to outside the unit. If these wires are in contact with a wet surface the alarm will activate. I wrap the bare copper wires around a small 2 cm or 1" piece of gypsum drywall, with a slight separation between the wires. If the drywall becomes moist the resistance drops below 1 meg ohm and the alarm activates. I use a DC wall wart with a voltage regulator to feed mine, but a normal 9 volt battery will also work. The unit may still detect fires, but use a regular unit for this.
Good use for old smoke detectors! One potiential problem is that the threshold might not be 1Mohm
True, it may be different from the old ones I've used. It's easy enough to test the unit before making any mods to it. The six I've modified all work fine. I should get off my duff and make a video and post it ;-)
It's well known that CO detectors are cross sensitive to H2 gas. I have experienced it myself with my personal gas detector which I have for work, it is a quad sensor detector which detects H2S, CO, O2 and LEL%. The detector can go off when you are near a charging station for forklift trucks for example. The lead acid charging cycle releases H2.
Hey NurdRage,
Idea: industrial adhesives. The two applications I've been curious about are how copper is attached to fiber glass to make PCB's (raw copper clad), and how automotive clutch and brake pad compounds are attached to metal backing plates.
Honestly I'd love to hear a chemist's take on adhesives in general from weakest to strongest and your general perspective on use and classification. Perhaps even a bit of info on the bleeding edge type stuff most of us are clueless about.
Have a great day,
-Jake
It's good to see the bridge between electronics and chemistry in your videos.
I work at a golf course and in the equipment building we store around 40 electric carts. One year in an attempt to keep me from being killed by Carbon Monoxide (work as a mechanic in the building). The higher ups decided to install a detector. It started going off in the middle of the night from the Hydrogen created when the electric carts are charging.
I can personally attest this not only works but is extremely useful when lead acid batteries are present in a "confined" space. Invaluable even.
Didn't find out about it here (accidental discovery) but I'm certainly glad someone covered it.
Useful for people with lead acid batteries, such as off-grid solar houses. Thank you kindly.
I had flooded lead acid batteries in an off grid solar power system and they were setting off my carbon monoxide alarm and I had no idea why. The problem went away when I switched to lithium ion.
Well know you know why
Shaun Dobbie
You were overchargin them. Lead acid generated hydrogen when overcharged. 13,6v is the maximun for lead acid. You can do 14,2v if you are using it as its charged but for stand by 13,6v at 25*C is the max. It greately changes with temperature so check that.
These flooded batteries need the higher voltage or they will not charge properly. I charged them as advised by the manufacturer and even then they can still give off some gas. They were inside a small shed so not much space for the gas to dissipate.
The overcharging is puposely used to create those bubbles in order to mix the solution. Not doing that would decrease the lifespan of the batteries because u get higher acid levels in the lower part of the battery. There are also systems that pump air through the batteries to do that which is even better for the lifetime.
How to detect Hydrogen the cheap way: Strike a match. If you survived, there probably wasn't any hydrogen around... :P
twocvbloke LOL
I knew I would find nurd rage when I looked this up!! Cheers! I just bought a combustible gas detector and I want to know how it works.
Question: carbon monoxide detectors should be placed near the floor because CO is heavier than air. Propane is also heavier than air. But most "natural gas" is methane, which is lighter than air.
Should you place this combination sensor near the ceiling or near the floor?
Just recently I tried to detect CO in my hydrogen product stream with such a thing. The test gas we ordered for our gas chromatography was taking months and I wondered, if such a thing could give me a rough estimate of the concentration in the lower ppm area. Then I found out about the cross sensitivity the loud way :D
Heating some metal to detect gas? That sounds a like a great id*BOOM*!
Everybody likes an ataboy every now and then and I think I enjoy watching your lab videos over all the others
Our calibrated combustible gas sensors got fooled once by this effect. I worked for a propane company, we got a call about a CO leak in a home. The FD came and vented the house so I was called to find the source. The appliances had been off for a couple hours by the time I got there. I got readings as soon as I walked into the house as if the gas burning appliances where still on. They had been off until I got there. I could not figure out what was going on! Then I noticed that the customer had a solar electrical system in the same room as the boiler I was testing. The recharging batteries were housed in a plywood box that had a crude flex vent to the outdoors. The readings coming out of the hole to the outdoor air were off the scale! It was hydrogen, it had to be, that's what the vent was for. I got on my phone and Googled this. Sure enough, I found some discussion about nuisance CO fire calls caused by a person who had a car battery being charged in the garage. It was setting off the CO alarm in the house.
The piezoezoelectric effect goes both ways, it can also be used to dettect shock, so some piezos are indeed sensors
Man seeing this is like the most exciting thing in this month!
Great video! Thanks for sharing!
There are some printed tech based CO sensors from SPEC that have quite low cross sensitivity to H2S. They also mention chemically selective filters being available. Of course these features would be well out of range of the low cost consumer CO detector, but the base sensor is quite reasonable (PN 110-109 is $20).
Probably should mention that H2 and CO are both lighter than air, which requires a high mount point. Some flammable gases are heavier than air, requiring a low mount point. I think it's better to get separate devices for them, or if they're cheap get two and mount one near the ceiling and the other near the floor.
Fireangel co sensor is also very sensitive to ethanol vapor in the air
5:30 Well I guess one could consider a piezoelectric element as a vibration sensor, given that they are sometimes used as contact microphones
He probably meant that some people think that it's the actual sensing element of CO/Smoke detectors
This is important when you consider that hydrogen producing fuel cells for cars and other energy needs maybe coming in the future and they need for a hydrogen detecting equipment has not really been considered by that emerging market. And cars that use straight hydrogen gas of course need very quick accurate leak sensors.
This would seem to suggest hydrogen might not be a bad way to test one of these alarms. If you have an older alarm and want to know if it would still detect something, you could give it some hydrogen to test it - and as you have shown, hydrogen is cheap and easy to make. Probably simpler to buy a new unit if it is old, but interesting that it should work in theory. Making CO, on the other hand, is probably quite a bit trickier, and probably a bit risky too if you make a fair bit to set off your alarm.
What's up with the hyperflexion in your thumb?
Your videos never show up in my sub feed :/. I have to periodically check your channel directly.
I work with hydrogen qll the time. Thanks so much for this information.
5:31 That's the piezo buzzer that does the annoying alarm, right ?
GiggitySam Entz yes
Would you consider doing another Q/A video
A few months ago I had a smoke alarm (First Alert) give a false positive... and it just wouldn't shut up even after I moved it outside for a few hours. I've replaced it with a Kidde sensor. After reading a bit more, I've found that high relative humidity can trip the alarms. :\
NurdRage i have some questions but it is not related to the video, way out of subject. What makes a flammable? Is it the chemical structure? What difference do they have from other substances that makes them flammable? Hope my questions make sense. By the way, your channel kicks ass
NurdRage, odd question... what manufacture of 4 gas meter did you have that picture from MSA or CSE?
Very cool. I know it's about the science, but it's great when you do stuff that could end up on McGyver
honest question: Why are most consumer grade gas detectors (H2S, CO, H2, etc.) so expensive?
Destruction of oxygen? Is there a more accurate term for the sensed reaction, something like oxygen scavenger sensor or just a SnO2 reduction sensor?
Wow i though you were dead. I was just checking one of your old videos and seeing whan was the last time you uploaded i found like 5 videos i never got in the feed
check if you have notifications turned on for my channel. If you do and still aren't getting anything, submit a bug report to youtube to tell them to fix it.
Would you be able to do the synthesis of paracetamol please
Do some more experiments with gallium if you can.
Mikeselectricstuff took apart a formerly very expensive portable gas sensor, and he toredown the electrochemical sensors as well.
Could you show how to make a cell like in the sensor
the only reason the sensor detected hydrogen is that natural gas and CO contain hydrogen!! The sensor is merely a hydrogen detector and the layout of the sensor is very similar to a hydrogen fuel cell!
Cool !
Definitely going to go and get a detector and play with it.
snowdaysrule2's discovery sounds like a great feature to have.
You can definitely learn enough electronics to start tech-phreakin this stuff.
(the round black piezo thing is the beeper)
hehehe, yeah, definitely trying to learn more electronics.
As for doing it yourself. Do wear hearing protection, or even disconnect the alarm and just use the display. I suffered temporary tinnitus because i was doing it so long and it was so loud. Have fun :)
Could this be used with other flammable gasses like phosphine, hydrogen sulfide, and organic solvents?
Does then tin oxide degrade significantly when exposed to too much hydrogen?
Ah at least the CO detector does degrade, okay.
But I think it will do more quickly than for regular house use XD
CO detectors also give false positives to solvent vapors. I learnt it after new gas detectors were installed in my Uni's labs and someone tried to clean something with isopropanol.
Whole building evacuated, people in the monitored areas can't use any solvent outside of a fumehood anymore...
No, it was specifically the CO alarm that went off.
Maybe the CO sensor steals H2 from isopropanol and makes acetone...
Piezoelectric disks can be used as an input sensor too. They can be used to detect vibrations. They generate a tiny voltage when flexed.
Considering that he was complaining about them being labelled as sensors specifically in the context of this device's schematic/circuit diagram, thier hypothetical other uses aren't really relevent. Labelling them as the sensor is just an error, plain and simple.
Make one about americium in smoke detectors
Will the combustible gas sensor also work for CO detection as well? I understand that it already contains a specific CO detector, but CO is a combustible gas too.
yes it does!
(although they include the CO detector so that you can tell the difference and know if you should close the gas line, or turn off the furnace. Only knowing it could be either one doesn't tell you which problem to solve.)
Could this be used as a viable alarm for a electric hydrogen/oxygen generator to make sure I don't blow my self up
yup, go for it :)
NurdRage Thank you.
You won't, since hydrogen is significantly less dense than air, so it will stick to the ceilling and unless you're tanking a Tesla battery into an indoor swimming pool, you shouldn't even come close the reaching that level.
very well done my dear friend.... i can't wait to meet you again in ontario in july...
What's happening in July?
u sure he'll let u see his face??
Maybe NurdRage is HowToBasic?
where can i get some of these broken detectors?
I used to live in a predominantly Jewish community. Everyone carried one of these things around like it would ward against death for some obscure reason.
god help me, i lol'ed
i actually got a notification for this one
ben jordan same
Hello, Do a carbon monoxide detector exist that don't have be replaced every couple years?
not on the market - cause ... you know .... Buisness ?
similar to you 40-60 watts lamp in america , those could be lifetime tungsten tubes .... sadly .
Oh the humanity!
lol u used the Zn u plated in that "make Zn from sth" vid
Really nice! I had always wonder how those alarms work, but never bother look it up. I expected the electronics to be quite simple (just detecting changing resistance, voltage or something like that) - but the sensors was the thing I was really wondering about, so thanks for that.
I GOT THAT NERD RAGE
NERD RAGE
I GOT THAT NERD RAGE
Technically speaking a piezoelectric disc is actually a sensor as well. It can generate a voltage (signal) in response to a physical interaction. It's a passive sensor, but no less a sensor than an LDR, or even an LED, which can be used to sense light, though not nearly as well as it emits.
That's kind of like saying the wires in the circuits are also sensors because they'll output a signal if you pass a strong magnetic flux through them. It's a device designed to detect combustible gasses and carbon monoxide, any utility of the components outside of that context is irrelevant, ESPECIALLY considering the sites he was talking about are supposed to be explanations of what the components are in this specific type of device. Labelling the speaker as a sensor on a schematic or circuit diagram isn't some oblique reference to hypothetical other uses, it's just wrong.
It wasn't labeled at all, he said that they're sometimes referred to as sensors but they're not, I corrected that. And yeah, technically speaking, if you're using the wires to sense that magnetic flux, then they're sensors. In a circuit designed to detect a knock on a hard surface, you mount a piezoelectric *sensor* to detect that vibration converted into electrical current. When you want to generate a tone, you use a piezoelectric buzzer. No matter what you call them though, they are piezoelectric transducers. A transducer converts physical interaction into electrical current, and vice versa. A thermocouple is a transducer, it detects a physical property (temperature) and converts it into a voltage. Another great example is a MEMS device. A device which uses mechanical components to detect physical stimuli and respond with an electrical signal, which is exactly what a piezoelectric transducer does.
The big take away here is that what he said wasn't correct, and that's what I was disagreeing with. What you call it depends on the application, but it is a sensor as well as a "speaker". I was not arguing that it should be called a sensor *in this circuit*, but it wasn't labeled as such so I was purely disagreeing with NurdRage's comments on the subject.
What he said was "it's not in itself a sensor, although I see a lot of websites that inaccurately mislabel it as such." If he had just said "it's not *in this circuit* a sensor" and left off the part about them being mislabeled, he would have been right. It is a sensor, in a circuit where it's designed to be a sensor. It's also a "speaker", in circuits where it is designed as such. I'm not trying to be sideways dude, just trying to correct misinformation.
You're making my point for me. In this circuit, and any circuit relevant to this video, it's not included to detect vibration, just like wires aren't included to detect magnetic flux. Ergo, it's not a sensor. End of story.
And you're not trying to clarify, you're being a pedant and muddling the issue for anyone who may not understand circuits or English well for no other reason than a smug sense of superiority.
The hydrogen sensor seems pretty cheap by itself:
www.digikey.com/product-detail/en/sparkfun-electronics/SEN-10916/1568-1410-ND/6161752
Might be able to rip out the old sensor and drop this one in.
Thumb broken @ 5:31
Great videos !!
I clean hydrogen cooler at the power plant will be trying this
Hitch hikers thumb gene here to
why does your thumb curve like that?!?!?!?!?!?!?!?!
It should be noted that hydrolyzing distilled water (with a bit of table salt in it) is a lot safer, and doesn’t require any dangerous chemicals, but you will need a DC power source, wire, and carbon electrodes (get them from a #2 pencil). Hydrogen it still flammable, though, so no smoking during the experiment! :) You can also use a car battery, instead of a DC power supply. Depending on the voltage/current, you may have to wait a bit longer to build up enough hydrogen gas to set off the alarm.
I wouldn't put table salt in an electrolyzer. It'll probably produce chlorine gas and hydrogen instead of oxygen and hydrogen.
NaCl and water mixture will produce chlorine unless you have low concentration of salt and high enough voltage. Oxygen production requires higher voltage than clorine
Sodium Hydroxide is a better choice for electrolysis.
I mix formic acid and sulphuric acid together in enclosed spaces. I use the beeps as white noise for my descent into sleep.
That was fun
MEMES substrate😆
+MyProjectsTV MEMS. Not MEMES lol.
MEMS stands for Micro ElectroMechanical Systems.
Shreyas Kulkarni That makes more sense😂
Neat
Finally something I'm interested in,not Fortnite......ew
Dank.
FACE REVEAL PLZ
Detect hydrogen by lighting a match!
ARGH! NO! Cut the audio out! Fuck's sake!
turn off the sound.
Glad to be early for once
This scanner yeah truth because I went to titiwangsa malaysia hospital I saw the emotion so suspected, I trough that mafia did and others maybe police, its not funny im just in an circle
wat
Greetings fellow nerds
i think im first