Electronic Basics #19: I2C and how to use it
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- čas přidán 27. 02. 2016
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In this episode of Electronic Basics I will present you the most important facts about the communication protocol I2C and how to use it with an Arduino.
Music:
Killing Time, Kevin MacLeod (incompetech.com) - Věda a technologie
Well, I'm still confused... I guess I have to do things myself to actually understand
For me you moved away to quickly from the I2C theory and got to involved in the radio module. I'd rather have seen you explain how the bus works with single and multiple devices. Although I could follow what you were explaining, I believe it's going to be to complex for a lot of viewers.
I compliment you anyway on doing an excellent video. Presentation and detail were precise and professional.
+Kenneth Tan Agree with you on that, sir.
I was completely lost when you explain about those bit ordering.
+Kenneth Tan I think that explaining very technical subjects such as the detailed bit order used in I2C is not easy in a video. I learned electronics before I went to university and became an engineer mainly by reading the manufactures specification documents. This was in the '60s and '70 so no Internet, CZcams or Facebook. I would write to the manufacturers and ask them for data sheets and catalogs. When they came I would read them over and over and over trying to understand the meaning of all those words and numbers.
Now you don't have to write to the manufacturers but, if you want to really understand what these parts do, you should use the Internet to find the data sheets, catalogs and application notes.
For example, here's the I2C web site with very detailed explanations of how it works. (i2c.info/i2c-bus-specification) It can be a bit overwhelming but if you keep at it *AND* watch videos like this one, you will figure it out. For me, someone tells me how a thing works is not as powerful if I struggle through the process of figuring it out myself.
Good luck. I admire you all for taking such a keen interest. For me it has been a 40 year process of solving puzzles and getting paid to do what I would have done for free.
+Robert Shaver Actually Robert, GreatScott does an excellent job explaining technical stuff, but my opinion about this video is, that he should have sticked with more detailed I2C subject matter. Still it remains a very good video
Robert Shaver yes I agree with you. It is much more valuable to learn it by self teaching and imagine how awesome it will feel to finally get it! I’m on that journey myself to learn synchronous data communication such as SPI and studying a lot of resources.
A good description of I2C would take an hour.
This is such a great channel. What ever technical stuff you search in CZcams, you can just find the most in this channel and with precise explanations.. woah..
Thank you so much, been self learning radio theory and building basic transmitters for a while. This is by far the most helpful series of videos I've found to date.
As always great video! I was just asking for an I2C video from another electronics youtube page and 30 minutes later you uploaded one XD
Thanks for the real life example! This is by far the best explanation I've seen.
its always nice to watch your vídeos, really love them !
Love your videos ! FM IC Was a great way of explaining I2C Interface .
Another awesome video. I can't wait for next video!
I always use I2C but never how it work before. Thanks. ;)
Looking forward for the 2nd part of this video!
As always great video. Thank you for the useful information.
you are a genius, congratulations! in the future I hope to see you over youtube, merits much more!
Good project, as always
Best video in a while, Thanks for the break down
what hapend if you connect 2 same devices with same device address, for example 2 identical lcd modules or temperature sensors, is it possible to change device address? thx
Perfect tutorial! I hope that you would make more I2C or one wire tutorials!
I just love ur videos! very well explained
Great video Scott. Just one comment though, the oscilloscope traces show that the rise times are rather long, 10k pull-up resistors are rather lazy. Most device data sheets recommend smaller values, like 3k3 or 4k7. I use the Arduino processor's bigger brother, the ATxmega which runs much faster. Even with a software i2c driver I can run at full speed of 400kbits per second. At this speed I need 1k5 pull-ups to avoid data corruption. If you're worried about supply current, remember that current only flows through these pull-ups when the line is driven low and they float high when the bus is idle. So if you have only occasional message traffic the duty cycle is incredibly low, meaning the supply current increase is negligible.
Great points!!
Your comment is interesting, but the capacitance of his oscilloscope's probes creates an RC that is most likely the reason of this lazy rising time IMO. As you can see the falling time is much shorter because the current doesn't flow through the resistor but thru the MOSFET instead. If he changes the pull-up resistors from 10k to 4.7k or even 3.3k, it won't make the rising edge much sharper. The only way for him to make sharper edges is to disconnect the probes and significantly reduce the parasitic capacitance.
@@Les-electroniciens yes it is the scopes fault but not because of the RC but because the scope has only 1mb of memory and can not display accurate information
Is the possibility to do do a one way circuit that the current can only flow one direction if there is plz answer this i need you help
Love your each and every videos
ahah you write your "1"'s just like my german physics professor, gets me every time! "why's he writing a hat?" :p
Hi, I need to make an I2C communication between an Esp 32 and Esp8266, where can I find info about?
Hi mr. Scott, could you please tell me which book should i read in order to understand as u understand the arduino language.. Please...
what is maximum distance for i2c communication.
ie. i'd like to have multiple devices (mostly relays and sensors) across house, garage, workshop, well, etc .. where distance can be up to 130 meters.
is it possible ? or there's need for other solution ?
Enjoyed it. Thanks for posting.
I love your content keep up the good work
great job great scott
What is the cheapest controller in your estimation I can use to build a diy i2c circuit?
Can someone help me to figure out how to build own nanoleafs? I want to detect with a esp32 automatic how much own panels are connected and set individual colors and animations. But how can it set automatically number up the IDs for every panels? Every panel should have 18 rgbw LEDs. I don't know which LEDs I have to choose.
great scott how do you keap your elektonic components?
I got some solar garden light, they light up when it gets dark, they doesn't work anymore. the board contains a resistor and a voltage regulator(ana618) can someone help me to fix them? Thanx! Sorry for my English...
Could you do an add-on video on LIN-Bus communication between 2 Arduinos?
How do you connect multiple identical slaves ? For example 2 or more fm receivers ?
Hey Scott! Could you make a Bluetooth Volume controller dial for PC using arduino? I have been looking to buy some for a while but there are none out there.
Good video that gives a nice overview of how to use a scope with a Arduino to see the i2c. Thank you! Sure, it is not detailed. But it does give a good overview.
Wow, I lost you right at "If you've ever implemented...."
Nicely explained. Thanks.
Love your videos. so interesting
Yes!!!!!!!!!!!!!!!!!! I love the electronics basics! Can you make more how current works and stuff?
i want to get in to electronics i want to buy everything at once i live somewhere where it is impossible to get this stuff or mail sould i buy a lot of arduino uno?
awesome as always
Can this fm module also transmite FM ?
Hello greatScott, can you please make a video about the MCP23016. I tried to use this IC but it didn't work . Thanks
Nice handwriting. And nice video. I would suggest to lower the 10k resistor to like 4k7 - the scope signal clearly shows the rising of voltage is quite slow.
can you share me the format of sheet your filling by hand , after reading datasheet.
can you make some basic projects with arduino
Kannst Du erklären, wie das mit dem Erweitern der I/O funktioniert, also wie ich damit komplexere Bauteile ansteuere, wie ein LCD, TFT oder Sensoren? Oder geht das nicht?
can u share the full circuit diagram as this one is not visible?
You should totally do a video on spi and/or o e wire. that would be so great!
Jut what I need it
thanks men I was about to start working on i2c protocol
where do you buy your strip board?
thank you GreatScott!
I have seen many cards in industry which have RS-485, Can-bus communication.
Eathernet communication and Can-bus, how single controller can do two different communication protocol
All this technology and it always comes down to sticking two crudely torn bits of paper to label the channels on the scope. Love it. :)
Your first Video that is hard to understand for me, but excellent
great video. Can you make one about a "shower water meter" to keep track of your consumption or a "power watt meter" to plug in between your devices and power socket?
Is serial bus the rx\tx communication protocol?
Excellent video !!! Thanks !!
I love your handwriting!
Nice tutorial,,
Make more I2C and arduino..
Thank you.
Nice video again!! keep going
can you make a video about cheap diy 3d printer kits and how well it works?
hi greatscott.............
your videos are super cool. i like them very much. i have watched your all videos nearly 5 times each.
but everytime it is interesting to watch it again......
also can you make a video about diy IR proximity sensor????
Why ... why does it look so much fun :D I now gonna buy me some more I2C devices.
I do have a few already but your video made me wanna get a FM reciever. Great videos like always and your outro sounds alott like: "Daithi De Nogla"... But yours are alott more informative, and equal if not more fun to watch :D
(comparing a gaming channel with Electronics? why not both! one day, Ill build a gameboy, with blackjack and i2c)
Do you have video about 1wire?
greate video :P can you make a tutorial on how you wut do this with out using the wire library ore any othere library ?
Why do you use massive lines of solder rather than jumper wires?
Can you please describe pull up and pull down resistance
what is better i2c or the serial RX TX??
I remember watching this 5 years ago and I understood nothing. I got to learn Assembly in university and now it seems so intuitive.
I am currently using RTC clock with Arduino UNO and It doesn't need any external pull up as Mega328 has internal pullup.
I find adding pull up resistors in my project to stop working. Wire.h seams to use internal pull resistors.
Regarding FM & PLLs. Sanyo's CCB (Computer control bus) seems to be very popular to talk to these kind of chips as well.
what is the simplest communication protocol?
Could you please make a video on how to trouble shoot arduino? I dont expect you to make a video just because of this but hopefully reply/ think about it? I was using my arduino connected to my laptop (macbook air) when the laptop suddenly restarted. The circuit was a 12v led controller, and none of the pins seemed to have shorted. After restarting, whenever i plugged my arduino in, the pin 13 led would always just come on and not blink like its supposed to. Other than that i always get the dreaded stk500 avrdude not responding 0x00 error. Any ideas why this could have happened, maybe how i can fix it? Thanks a lot for your time, really love your vids :)
Awesome vid!
Can I have a help on communicating with PT2322 please
Is the pullup resistors really needed on arduino? i aways used the i2c protocol without and works like a charm...
The Arduino has integrated pull ups.
Kannst du mal zeigen, wie du deine Teile sortiert aufbewahrst? Würde mich schon interessieren wie andere das mit größeren Bauteilmengen machen.
Can you make a video about the one wire interface please?
can you plz provide the i2c data-sheet?
Can you do the same video for jtag please it would be awesome thanks
thanks so much!!! can you share your code to make some test?
how can I make my own Bluetooth for music?
How about about an SPI video since the arduino uses it ?
Why do you use stripboard? It seems like a hassle to use, and only looks useful for "gumstick" modules (which do, admittedly, have their niche.) I think that something like perfboard seems like a more flexible alternative.
This bass in the intro is awsome
@GreatScott You have great videos! I study for electronics enegineering and this year I'm doing something like "final exam project" (don't know how ot translate it :D ), and I have learned a lot of from your videos! Just like this I'm using 4 I2C devices and this video helped a lot :) Thank you very much Scott :)
+Fred Chang You're welcome
Waiting for something abot rs232 and next generation (especialy rs485). You are good teacher :-)
can you decode stereo and RDS using this device or output complete MPX Signal to external RDS Decoder?
There is max output on the chip. Have a look at the datasheet.
I'm working on a project that requires multiple i2c devices. I was wondering what your recommendation would be for the values of the pull up resistors. Thanks!
+Raymond Barakat If it's a 100kHz communication 10k works just fine. If you use a faster frequency you might need to use something like 1-2k to get the required rise and fall time. The datasheet of your ICs also often mention a recommended value.
Wait does the chip has its own antenna?
can you do a video on using multiple i2c on a arduino.
it will help me alot.
hi GreatScott, can the diy oscilloscope you reviewed be used to monitor i2c communication?
+Adi Mulawarman Yes. But it only has one input so it can be a bit difficult.
Can you make a video about SPI interface ?
dear Scott, this particular video i did not understand It was like too much knowledge packed in a very small video. Could you please make another video on this?
You should do another pain test comparison of different frequencies this time.
Great vid thanks.
Excellent, you're getting smarter all the time.
In a future video can u plz make the topic one wire interface? Im really interested
Do you teach on your personal time?