How I2C Communication Works and How To Use It with Arduino

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In this tutorial we will learn how the I2C communication protocol works and also we will make a practical example of it with the Arduino Board and a sensor which uses this protocol. You can watch the following video or read the written tutorial below.
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Music: Aduro by Jens Kiilstofte (machinimasound.com/music)

[@rahulfromkerala]

2 hours of reading and then here comes this video where everything is well explained in under 10 minutes... You tube is spoiling me...

[@thesauceboss5995]

This is one of the only videos I've found that explains how pull up resistors can affect the speed at which data can travel on the SDA line. Fantastic video that explains how I2C works. Great job.

[@vijaykumar-hc6jz]

The bit sequence was so well explained that I had to print the screenshot of it for future reference.

[@mark879]

Awesome video! I especially appreciated the protocol/packet breakdown. Thanks very much!

[@kamuizero]

What a great video! Very clear explanation and simple demonstration on how to use it. Thank you very much.

Very useful for beginner like me, thank you! :)

[@RamswaroopSorencool]

This is so beginner friendly! Thank you so much. I used the same illustrations to make few students understand the same. :)

[@kiranbs5057]

Watched many videos on this protocol I was never able to grab the concept clearly and I found your tutorial and it made my life simple . Thanks man u have explained and visualised the concept neatly .

[@nobodyspecial313]

Sweet tutorial! Really like the illustrations that went along with your explanation. After looking at a few cool project videos where people are using Arduinos and other microcontrollers, it makes me wish my college had a class on these!

[@iancorcoran7560]

Dejan Nedelkovski

[@Gupatik]

it's been 8 years now or so, are you still alive bud, and did you learn this arduino and microcontrollers stuff. Anyways, hope you are doing good

[@elonmuskmtmt886]

This is by far the most thorough and yet still concise explanation I have found! Awesome video!

[@HowToMechatronics]

Thank you!

[@AliHSyed]

OMG thank you so much, I've been so lost with i2c until I watched this video!

[@PhDFernandoCoach]

Thank you very much for this video, Dejan! The information is clear, well organized and dynamically illustrated!

[@fleshTH]

This was extremely well done! Good job! It was very clear and now i'm off to do some new projects.

[@morgard211]

Thanks! I didn't want to memorize it, but to understand it and it worked! :)

[@ronimine]

Very clear and instructive. Well done. Thank you !

[@mohanmanoharan1387]

super, really appreciate for the tutorial. Request similar other Serial protocols SPI explanation. CAN, UART. thanks

[@MrJeppeholt]

OMG dude that was perfect. I have been struggeling with i2c for a while now but this made it click. THANKS! :D

[@minanovkiril]

дејан секоја чест! браво за споделеното знаење! сеа дознав за твојот канал, ќе разгледам што си споделил со задоволство.

[@GetElectronics]

I always like tutorials that show how to use sensores without relying on 3rd party libraries other than the wire one. Very useful for learning.

[@MkmeOrg]

This is fantastic! Sharing on Mondays live show. Great vid. Cheers!

[@markconger8049]

Thank you for this tutorial! I knew the overview of how i2c works but not the specifics. It looks similar to packets in TCP/IP.

[@ExtantFrodo2]

I now understand what I could not understand previously. Thank you.

[@omaralharran]

You are the best. Thank you for taking the time to explain I2C on such indepth level.

[@clearwavepro100]

Thank you! This is really well done, clear and interesting!

[@stevetobias4890]

Excellent explanation. Also helps me in a project where I will be using breakout boards for the first time. Thank you

[@IRgEEK]

Great and informative video! Thanks so much!

[@mrcamperon]

thank you Dejan. great tutorials, very well done the clip too

[@chasenjohnson797]

Great description of I2C. Thanks:)

[@pacokun1]

Thanks, I understand how it's work now :D It's will really help me :D

[@iiDougieii]

Thank you for this video. I needed a refresh of what I already learnt in the past. Good work !!

[@HowToMechatronics]

Thanks!

[@naboulsikhalid7763]

Hi, Mentor. What to say, thank you won't be enough. great, detailed video.

[@devarajan2291]

excellent. thanks a lot. you helped me in my interview preparation.

[@thtr9647]

Omg, this is so good animation. Appreciate !

[@danielrufenacht3722]

Hello Dejan Many thanks for your time to spend in order to explain us these very clear tutorials. Daniel from Switzerland

[@lan5053]

So easy to understand. Thank you!

[@nalorin]

SUPER helpful tutorial! Thank you so much! I have an ALS31313, and all the code examples I could find online (including the manufacturer's website) don't work. Your tutorial makes things SO much clearer and I managed to get my magnetometer working within 15 minutes of watching your video! THANK YOU!!!

[@HowToMechatronics]

Glad to hear it, cheers!

[@excite236]

saved me so much time working gy-80 thanks man

[@poojithaborra1650]

Clear explanations... Tnx

[@templocal]

You explain things very accurately! Thank you!

[@erniea5843]

this video is still providing value after all these years!

[@HowToMechatronics]

Happy to hear it!

[@mitkopetrovik259]

Nice, it is desirable in the following tutorials to explain the I2S protocol and what is exactly the difference with I2C

[@ramazans8114]

Thanks, really very clear explanation and very effective.

[@michaelvogt7787]

Dejan, I was looking through youtube for a decent tutorial about the I2C bus as implemented on the Arduino. I have a class of high school students who could use a good demo. I didnt expect to find your EXCELLENT tutorial, one that would be useful even to professional electronics engineers. I wanted to let you know you did a nice job, and it was appreciated. Dr. Michael Vogt - North American Robotics

[@michaelliles6755]

Finally someone who knows what he's talking about ! Thank you! Not one person on the Arduino site or any other place online have suggested hooking up scl to scl and sda to sda . Everyone says hook it up to A4 and A5 . I bought two units so far thinking that either I broke it or it was doa. well turns out that both work fine. why is this info missing from the arduino site?? anyway thank you very much!

[@igorradevski9147]

Thanks Dejan for this great tutorial. It helps me a lot! :)

This is an amazing tutorial. Thank you very much.

[@glikar1]

Thanks, very good in depth tutorial!

[@harshatechvideos1859]

Nice work and thank you very much for providing these quality videos.

[@clirimmurati6183]

AHH such explanations, love it

[@druggles1]

Nice presentation along with a great explanation. Thank you, for sharing, Dejan!!

[@chinhcd]

It saved me so much time and hassle. Good job!

[@iconofsin1043]

Very well explained, thank you very much!

[@totalnewbie8619]

This was an informative and helpful video. I also liked how you explained with graphics. It made things easier to understand.Thank you and please keep doing more videos like this for beginners like me. Best regards.

[@HowToMechatronics]

Thanks, I'm glad to hear that!

[@andrebernardmennicken4685]

Verywell explained, clear, direct to the point, Thank you...

[@arvydasstankevicius5277]

So well explained!!! Thanks. Subscribed.

[@narekisaghulyan]

amazing tutorial, thank you!!!

[@Taran72]

great Tutorial! thanks!!

[@fahadmubeen6272]

To the point, simple and clear, well done! which most people struggle to explain. ~This is coming from a Professional Embedded engineer.

[@HowToMechatronics]

Glad to hear it, thanks!

[@thomasalexander1563]

Great Tutorial,,, Make more .. Absolutely waiting for all your tutorials,,

[@alexpelagaggi]

Dejan Nedelkovski, you are the best. Thank you very much for making this video.

[@spbains1966]

Excellent tutorial bringing out the details very clearly

[@KunalGautam]

Thanks, it helped me a lot to understand how I2C works.

[@warsini5386]

Wayagkulot

[@aragonv1]

ΤΗΑΝΚ ΥΟU.. ! A VERY CLEAR EXPLANATION OF i2C DEVICES

[@ksawery6568]

Great tutorial, thank you!

[@miguelluisrodrigues3704]

Thank you brother, you help me a lot in my projects

[@user-yw5yr4mk2c]

Good explanation of the protocols' packet. thanks

[@junaidasim1021]

Accurate and up to the mark explanation thank you so much

[@maxpolaris99]

Your examples are very helpful for us slow pokes with little to no insight. Good Job.

[@senai_mecatronicabeta3737]

Muito bom este tutorial, parabéns.

[@rafaelmarroquin4429]

really great thanks for your time, and explain this. I show similar to shift register :D

[@PiCoVienna]

Excellent, easy to understand, very precise!

[@erichertsens]

thanks, appreciated from the Dominican Republic

[@krozareq]

Good to know how all this works. I've used the Linux i2c and SMbus userspace tools, but never really knew the hardware functionality behind it. GPU lighting is generally i2c and motherboard controllers use SMbus (both very similar though). Knew just enough to be dangerous and change RGB colors or monitor temps with a very light shell script and even shell functions. The OpenRGB project has the addresses for most hardware, including USB (mouse, keyboards, and some mobos use USB for communication to controllers).

[@pietrotosoratti799]

Thank you for this useful video !! You explained the topic in such a clear way !!

[@simplynilsw]

You said 124 devices instead of 1024 devices (0:52 min), but great video it helped me alot, thanks :))

[@alentech6091]

Amazingly well explained!

[@fromdeepitcame]

Yep, this is great. Thanks!

[@suzesiviter6083]

To clarify; the I2C lines are either high impedance or 0, you never drive the bus line high directly; that is achieved by de-asserting the '0' and letting the internal pull up resistors tie it to Vcc. The high impedance or low state on the bus prevents bus contention; that is a ground connecting to Vcc directly causing a short between any masters or slaves.

[@youseebruce5426]

A very clean and neat explanation... I understood clearly... Thank you very much.

[@abdelrhmansafwat6191]

Thank you very much buddy for your great illustrations :)

[@aubreydebliquy8051]

Thank you for a clear explanation. I used only SPI to date but now I know how to use I2C ... thanks...

[@roidroid]

6:00 just a headsup: You have the Arduino connected to two GNDs, with no 5V line.

[@AdityakrishnaMr]

Yes, that bothered me too.

[@AngryRamboShow]

@Blondie SL the white race needs you to make blond haired blue eyed babies. Stop being a degenerate and man up.

[@taimooramin1272]

Bro thats not a big deal he is also a human and if he has done any mistake that does not matter because if you have used arduino or any other types of microcontroller in past u can correct the connections easily

[@ksawery6568]

@Blondie SL Well that escalated quickly.

[@cinibar]

@Blondie SL Dark matter....hmmmm I once cut open a dead flashlight battery and found it to be very dark, black as coal in fact. I just figure it got full of the dark that it was displacing with light, and died when it got full. :)

[@mikelemon5109]

Awesome tutorial thanks a lot where have you been where I didn't understand that communication at all.

[@MathewPendleton]

explained perfectly. thanks!

[@EmciGad]

Very good and clear explanations! well done!

[@LaurinusPonpon]

I watched a few videos and this is the BEST explanation for I2C. Thanks

[@HowToMechatronics]

Glad it was helpful!

[@narendravasu6607]

Thank you sir Your explanation very simple and clearly. Very useful to me . onces again thank you sir

[@TheAkyatbahay]

thank you! i finally understand now!

[@victorchan8685]

Appreciate for your excellent video, you speak very clear and explain in detail! You are wonderful! Help a lot!

[@andremendes5116]

Nice explanation... the protocol I2c is very usefull, fast and need... Thank's for your time and information.

[@Patrick-ky7ez]

Amazing video. SOO many hours of reading pdfs with unnecessary tech jargon. You explained it perfectly.

[@lxndrskv]

Thanks man, I appreciate the video. I wonder what kind of issues you could run into if you ran 1024 10 bit devices on the same line. Electromagnetic interference may become a concern.

[@roboticacreativa9851]

Great!, Thank you for the contribution.

[@jackm416]

Great job of explanation ! Good graphics and clear explanation of the timing !

[@HowToMechatronics]

Thank you!

[@marklowe7431]

Perfect explanation. Thank you.

[@skeeveskeeve]

Best video I have seen on the subject.

[@reydus6651]

superb video mate. Explained it very easily.

[@georgekontellis3856]

Great work. Can we also see somewhere the procession of raw data into actual measurements? Do you use the sensor's librarys for that? We want to connect a CO2 sensor, a humidity sensor and two accelerometers. Also a BMP180... Thank you...

[@henearkrip]

Nice Work! Very clear and simple explanation!!

[@nemorotatory]

Thank you so much, It is very helpful