Electronic Basics #19: I2C and how to use it

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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)

[@alexkepa12]

Well, I'm still confused... I guess I have to do things myself to actually understand

[@KennethTanFotografie]

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.

[@rickyarinugraha]

+Kenneth Tan Agree with you on that, sir. I was completely lost when you explain about those bit ordering.

[@RobertShaverOfAustin]

+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, KZbin 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.

[@KennethTanFotografie]

+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

[@simplelyf4072]

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.

[@BikesBlades]

A good description of I2C would take an hour.

[@diginomad6016]

This is such a great channel. What ever technical stuff you search in KZbin, you can just find the most in this channel and with precise explanations.. woah..

[@kylebandy947]

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.

[@czarcorey1220]

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

[@pablo_costas]

its always nice to watch your vídeos, really love them !

[@sortsvane]

Love your videos ! FM IC Was a great way of explaining I2C Interface .

[@Diamonddrake]

Best video in a while, Thanks for the break down

[@x10iman]

As always great video. Thank you for the useful information.

[@alanly4515]

Thanks for the real life example! This is by far the best explanation I've seen.

[@mattiachie]

you are a genius, congratulations! in the future I hope to see you over youtube, merits much more! Good project, as always

[@id513128]

Another awesome video. I can't wait for next video! I always use I2C but never how it work before. Thanks. ;)

[@eldadyamin]

Looking forward for the 2nd part of this video!

[@Teukkaniikka]

Perfect tutorial! I hope that you would make more I2C or one wire tutorials!

[@shivanshpuri3065]

great job great scott

[@GamerBat3112]

I just love ur videos! very well explained

[@notionSunday]

Enjoyed it. Thanks for posting.

[@prytamkev954]

Love your each and every videos

[@MegaJanyjan]

awesome as always

[@mihtibby]

I love your content keep up the good work

[@maxximumb]

Nicely explained. Thanks.

[@gogetgoget8431]

thank you GreatScott!

[@JohnStraussmusic]

Love your videos. so interesting

[@BillySugger1965]

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.

[@djquestionthis]

Great points!!

[@Les-electroniciens]

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.

[@f.a3202]

@@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

[@BobtheBuilder-jc4xm]

Nice video again!! keep going

[@donaldfilbert4832]

Excellent video !!! Thanks !!

[@kaumohlamonyane272]

I remember watching this 5 years ago and I understood nothing. I got to learn Assembly in university and now it seems so intuitive.

[@nick1p.x226]

Yes!!!!!!!!!!!!!!!!!! I love the electronics basics! Can you make more how current works and stuff?

[@CodeAsm]

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)

[@Jackym266]

Awesome vid!

[@thomasalexander1563]

Nice tutorial,, Make more I2C and arduino.. Thank you.

[@id104335409]

Wow, I lost you right at "If you've ever implemented...."

[@cwbh10]

ahah you write your "1"'s just like my german physics professor, gets me every time! "why's he writing a hat?" :p

[@valentinocolaon6060]

I love your handwriting!

[@santiagoestevez623]

Jut what I need it thanks men I was about to start working on i2c protocol

[@IsaacMorton]

You should totally do a video on spi and/or o e wire. that would be so great!

[@fredchang5626]

@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 :)

[@greatscottlab]

+Fred Chang You're welcome

[@mohammedyasarshaikh4501]

Your first Video that is hard to understand for me, but excellent

[@danielmorgan7702]

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.

[@audiodiwhy2195]

Great vid thanks.

[@p1nesap]

Excellent, you're getting smarter all the time.

[@onjofilms]

Nice job.

[@Rohan-su9en]

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????

[@buttegowda]

Cool and thanks !!!

[@MYNICEEV]

Awesome.

[@benjaminrich9396]

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. :)

[@rklauco]

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.

[@hypt0ny]

Love your videos Greatscott! Can you do a project video soon? I love your projects, they are very inspiring

[@greatscottlab]

+hypt0ny I am working on one right now.

[@renechristmann2607]

This bass in the intro is awsome

[@6kbps]

200 000 subscribers!!

[@enriquecastrejon13]

pretty nice video

[@ariellevy7009]

nice video

[@MrMuniez]

Waiting for something abot rs232 and next generation (especialy rs485). You are good teacher :-)

[@MKA667]

I remember the old days of implementing I²C software routines in Assembly for the 16C84 ;)

[@mayurbhanushali815]

Great project ! Your electronics basics videos are very informative. Can you please make a basics video on H-bridge motor driver and make a power h-bridge . :)

[@greatscottlab]

+Mayur Bhanushali It is on my to do list.

[@CarlosDuqueMankalan]

greatscott , make a tv b gone whith a attiny 85 pls , i love your videos , go on!

[@evilspoon6833]

home made stickers on the oscilloscope priceless :)

[@Aperson-sv2hc]

You should do another pain test comparison of different frequencies this time.

[@d.g.s.7572]

Thanks!

[@greatscottlab]

Thanks for the support :-)

[@KurtBarcelona]

thanks :) it's a challenge

[@tw7522]

Regarding FM & PLLs. Sanyo's CCB (Computer control bus) seems to be very popular to talk to these kind of chips as well.

[@emptyheadideas]

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?

[@charldonvanderwaltsleben6055]

love from south africa

[@JTIngenieria]

Awesome! I'll use it when my package from china arrives!

[@ajayvora4127]

please please please make a video about using xbee digital and analog outputs... Thank YOU!! YOU are Awesome!

[@Alexelectricalengineering]

Thumbs up :) Alex

[@vidanatural_oficial]

This german guy speek nice english, I can follow everyting from Brazil.

[@greatscottlab]

+Julio Bedaque Great!

[@E-eeblogBlogspot]

can you make a video about cheap diy 3d printer kits and how well it works?

[@ThomasHaberkorn]

Could you do an add-on video on LIN-Bus communication between 2 Arduinos?

[@damarjatigumelar5013]

Nice

[@yerokal8233]

Can you please do transistors in your next electronics basics. ☺

[@prateeknaryal4031]

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?

[@KosutM]

GreatScott in mostly devices are used to 4k7 resistors as a pull up not 10k :-)

[@9642274475]

Dear sir, Please make a vedio on calculator I2C Bitrate This more useful for this continues video for aspirants ..

[@simondid]

greate video :P can you make a tutorial on how you wut do this with out using the wire library ore any othere library ?

[@CSO3DOnline]

that amplifier module looked interesting

[@danielmarequeiglesias5015]

I never understand a sh*t but i'm still subscribed. Still don't know why.

[@mifo1133]

if i can suggest video. I would love to see you measure some cheap china power amplifiers for distortion or even well know amplifier IOs like LM3885 or TDA7250. thanks for videos very informative!

[@Rahuldhebri]

You're awesome

[@greatscottlab]

+rahul dhebri Thanks ;-)

[@vidrogic1499]

No, he is great!! haha

[@ashutoshsoni2486]

can you do a video on using multiple i2c on a arduino. it will help me alot.

[@DoctorX17]

I’m glad nowadays I2C libraries are readily available, lol

[@elielouisa32]

In a future video can u plz make the topic one wire interface? Im really interested

[@TTVbygowtham]

Video about spi communication protocol

[@Project-DDE]

Can you make a video about the one wire interface please?

[@MrJamesbowen]

I find adding pull up resistors in my project to stop working. Wire.h seams to use internal pull resistors.

[@jlsn5307]

nice

[@majdinj]

Can you do a basic tutorial on SMPS.The one from wall AC socket converted to DC to power small gadgets "not DC to DC one" :) A simple fundamental principle will be more convenient. Like simple SMPS that only uses AC input --> diode bridge rectifier --> Capacitor --> MOSFET --> Switching transformer --> schottky rectifier --> Capacitor --> DC output.

[@rikilshah]

I am currently using RTC clock with Arduino UNO and It doesn't need any external pull up as Mega328 has internal pullup.

[@patrickyoon3461]

lol I don't understand anything :/

[@vidrogic1499]

You are not the only one.

[@DREMajed]

Oh " i don't understand anything" club I'm a new recruit. Can i join you guys?

[@treierxyz]

Please do a review of the new Raspberry Pi 3 Model B!

[@454guiltyspark]

Can you do the same video for jtag please it would be awesome thanks

[@luizz1997]

Is the pullup resistors really needed on arduino? i aways used the i2c protocol without and works like a charm...

[@greatscottlab]

The Arduino has integrated pull ups.

[@SarvasvKulpatiYT]

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 :)

[@navin233]

I really like your explanation and I understood every time but this video is difficult to understand 😔 . I wanst to know about i2c but I can't get itany where so plz. Make a video which contains about only i2c

[@MrDorkLard]

Like the new intro video, but prefer the old music :)

[@b10s]

+Malcolm Hunter This has been the intro for the whole Electronics Basics series since it has started... just sayin'

[@MrDorkLard]

+B10S Okay, I've not watched any of those. In that case - Correction: I prefer the music in the red LED display build intro.

[@halilbuyukturk7237]

can you make some basic projects with arduino

[@vivabenfica4]

@GreatScott can you do a video on transistors please! Also I know a transistor consists of a PNP or NPN junction and was wondering if this could be used to make a laser diode since a laser creates its photons from such a junction.

[@oniruddhoalam2039]

The junction of a BJT transistor cannot be used to produce light. To make an LED, you need to make the n and p layers with special materials.

[@Avriox]

A video just on how to work safely with lithium batteries?

[@farazturk1283]

dude try to make a awesome project for this summer

[@Rahuldhebri]

Love from india