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.

[@mark879]

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

[@vijaykumar-hc6jz]

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

[@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 .

[@kamuizero]

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

[@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

[@RamswaroopSorencool]

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

[@elonmuskmtmt886]

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

[@HowToMechatronics]

Thank you!

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

[@AliHSyed]

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

[@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.

[@PhDFernandoCoach]

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

[@morgard211]

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

[@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.

[@fleshTH]

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

[@danielrufenacht3722]

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

[@omaralharran]

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

[@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

[@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!

[@maxpolaris99]

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

[@ronimine]

Very clear and instructive. Well done. Thank you !

[@stevetobias4890]

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

[@MkmeOrg]

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

[@minanovkiril]

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

[@mitkopetrovik259]

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

[@ExtantFrodo2]

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

[@chasenjohnson797]

Great description of I2C. Thanks:)

[@naboulsikhalid7763]

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

[@alexpelagaggi]

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

[@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

[@templocal]

You explain things very accurately! Thank you!

[@aubreydebliquy8051]

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

[@mrcamperon]

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

[@clearwavepro100]

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

[@iiDougieii]

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

[@HowToMechatronics]

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!

[@devarajan2291]

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

[@IRgEEK]

Great and informative video! Thanks so much!

[@HowToMechatronics]

I hope you enjoyed this video and learned something new! If you'd like to support me making more content like this, please consider supporting me on Patreon: www.patreon.com/howtomechatronics

[@Scudmaster11]

I know you can get composite video out of it or something

[@druggles1]

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

[@pietrotosoratti799]

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

[@pacokun1]

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

[@chinhcd]

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

[@LaurinusPonpon]

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

[@HowToMechatronics]

Glad it was helpful!

[@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!

[@lan5053]

So easy to understand. Thank you!

[@spbains1966]

Excellent tutorial bringing out the details very clearly

[@EmciGad]

Very good and clear explanations! well done!

[@harshatechvideos1859]

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

[@henearkrip]

Nice Work! Very clear and simple explanation!!

[@glikar1]

Thanks, very good in depth tutorial!

[@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!

[@miguelluisrodrigues3704]

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

[@thtr9647]

Omg, this is so good animation. Appreciate !

[@PiCoVienna]

Excellent, easy to understand, very precise!

[@Patrick-ky7ez]

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

[@victorchan8685]

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

[@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).

[@excite236]

saved me so much time working gy-80 thanks man

[@igorradevski9147]

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

[@reydus6651]

superb video mate. Explained it very easily.

[@arvydasstankevicius5277]

So well explained!!! Thanks. Subscribed.

[@andremendes5116]

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

[@ramazans8114]

Thanks, really very clear explanation and very effective.

[@andrebernardmennicken4685]

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

[@user-yw5yr4mk2c]

Good explanation of the protocols' packet. thanks

[@mikelemon5109]

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

[@simplynilsw]

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

[@erichertsens]

thanks, appreciated from the Dominican Republic

[@skeeveskeeve]

Best video I have seen on the subject.

This is an amazing tutorial. Thank you very much.

[@thomasalexander1563]

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

[@abdelrhmansafwat6191]

Thank you very much buddy for your great illustrations :)

[@youseebruce5426]

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

[@jackm416]

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

[@HowToMechatronics]

Thank you!

[@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.

[@iconofsin1043]

Very well explained, thank you very much!

[@expectropetronus]

Simple and lucid explanation... Thank you

[@poojithaborra1650]

Clear explanations... Tnx

[@junaidasim1021]

Accurate and up to the mark explanation thank you so much

[@collenfisher3635]

Brilliant, and exceptional narration.

[@astudyspace7272]

Thank you very much for this detailed explanation. You made this topic easy to absorb. 🐣

[@Syria..]

amazingggggg you did save me after reading datasheet for days

[@rahazandifar5596]

Thanks for this concise refresher video

[@narendravasu6607]

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

[@alterguy4327]

This channel never gets old

[@leuc2475]

Thank you. It's simple to comprehend

[@alentech6091]

Amazingly well explained!

[@erniea5843]

this video is still providing value after all these years!

[@HowToMechatronics]

Happy to hear it!

[@jokopribadi6462]

easier to understand in this video. Thanks

[@ksawery6568]

Great tutorial, thank you!

[@SathishKumarbalu]

Nice ! Now i got a clear idea what is I2C.

[@Gereon_]

Very good explanation! Thank you very much.

[@clirimmurati6183]

AHH such explanations, love it

[@mohamedabdalla-es6ll]

Thank you very much for the clear explanation.

[@KunalGautam]

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

[@warsini5386]

Wayagkulot

[@Taran72]

great Tutorial! thanks!!

[@narekisaghulyan]

amazing tutorial, thank you!!!