How I2C Communication Works and How To Use It with Arduino

[@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.

[@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...

[@vijaykumar-hc6jz]

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

[@simplynilsw]

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

[@BatsAwesomeIn2030]

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!

[@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 .

[@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.

[@elonmuskmtmt886]

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

[@HowToMechatronics]

Thank you!

[@mark879]

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

[@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. :)

[@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

[@LaurinusPonpon]

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

[@HowToMechatronics]

Glad it was helpful!

[@sorenium]

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

[@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

[@Patrick-ky7ez]

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

[@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.

[@maxpolaris99]

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

[@kamuizero]

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

[@AliHSyed]

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

[@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!

[@alexpelagaggi]

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

[@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.

[@erniea5843]

this video is still providing value after all these years!

[@HowToMechatronics]

Happy to hear it!

[@aubreydebliquy8051]

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

[@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!

[@alterguy4327]

This channel never gets old

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

[@ngkhai5935]

There is an error at the circuit diagram. Instead of 5V you're connected to a GND. However, thank you so much, I learnt a lot from your wonderful video. Merry Christmas

[@mohanmanoharan1387]

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

[@omaralharran]

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

[@cmulder007]

In the breadboard diagram at 5:56 both the + and - are connected to ground on the Arduino

[@danielrufenacht3722]

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

[@ipadize]

i know its an old video and you probably already know that but you can shorten the Serial.print commands to one like this: Serial.print(String("X0= ") + (X0) + ("X1= ") + (X1)); then when the numbers are bigger or shorter it will automatically fit them together

[@chinhcd]

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

[@alextrujillo8861]

In the circuit diagram at 6:00, I notice GND is connected to the red and blue rail. Is this accurate or am I missing something? I thought I2C was active low? Was this a mistake in the wiring diagram?

[@BigyanChap]

I2C Communication -- Demystified! Thumbs up.

[@danielmarques7279]

Great video, really appreciate it! But I really think that explaining every line of the code would've been great!

[@erichertsens]

thanks, appreciated from the Dominican Republic

[@dorianmccarthy7602]

Intro RIP headphones users. But great info :)

[@matthewmorrison2071]

yep I almost died I swear

[@JohnnyFaber]

Same.

[@skeeveskeeve]

Best video I have seen on the subject.

[@SathishKumarbalu]

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

[@schlo9358]

Thanks for your example with the wire libary

[@MrJeppeholt]

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

[@naboulsikhalid7763]

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

[@excite236]

saved me so much time working gy-80 thanks man

[@tarunrjain9748]

Macha, I am a big fan of your channel. Macha I think u did a mistake .......in the tinkercad sample which u have shown in the video .....both the power supply are connected to ground.......Shouldn't the VCC one connect to 5v power supply? btw lots of luv from India ❣

[@mitkopetrovik259]

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

[@philippedrolet4853]

May I take a screenshot of the diagram at 3:30 for my undergraduate research paper if I cite its origin?

[@Syria..]

amazingggggg you did save me after reading datasheet for days

[@EmciGad]

Very good and clear explanations! well done!

[@icarossavvides2641]

There are a lot of Tubes about I2C but none of them make note of the fact that I2C is an abbreviation of Inter IC Communication, it was invented by Philips to help reduce the amount of communication tracking between IC's on a PCB, consequently it is a reliable communication system when used over short distances in a controlled environment, a PCB, but it was never intended to be sent overlong pieces of wiring (>200mm?). If you use this to connect to devices over long lengths of wire, especially if there are noisy items around like motors etc, be prepared for random communication problems.

[@adamsvette]

It's incredible that you can communicate with so many different devices using only 2 wires. also, the 2 SAME wires.

[@ExtantFrodo2]

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

[@ElectroMentor]

Utterly informative video much appreciation 👍

[@morgard211]

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

[@fleshTH]

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

[@stevetobias4890]

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

[@miguelluisrodrigues3704]

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

[@soniyachandran629]

Thank you for that simplified explanation :)

[@HowToMechatronics]

Glad it was helpful!

[@jackm416]

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

[@HowToMechatronics]

Thank you!

[@laurentmenten4644]

At 5:47, I noticed a small mistake in the wiring, both the VCC and GND on the breadboard are connected to a GND pin on the Arduino ... Anyway, great explanation ;)

[@templocal]

You explain things very accurately! Thank you!

[@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).

[@reydus6651]

superb video mate. Explained it very easily.

[@drcl7429]

Excellent. I thought i2c was going to be complicated

[@henearkrip]

Nice Work! Very clear and simple explanation!!

[@adolforosado]

Very clear and concise. Thank you. Seems books are written so you don't understand the stuff and you're made to pay more for tuition.

[@MkmeOrg]

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

[@riccardoz2953]

at the end u need 4 wires, ground, power, SCL and data. bewatre of voltages, couse recent sensors and some different arduino version need 3.7 and not 5v as powersupply. nice video|

[@степаалександров-с5р]

your English is perfect!

[@ЮжныйКот-м2э]

Что то мне мерещится русский акцент у автора.

[@BBRR442]

best tutorial on youtube thanks

[@HowToMechatronics]

Thanks!

[@Gereon_]

Very good explanation! Thank you very much.

[@nikoslykouresis2275]

Man I don't know if it's the weed, but your explanation made me understand most of this very clearly

[@collenfisher3635]

Brilliant, and exceptional narration.

[@pietrotosoratti799]

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

[@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!

[@jesseliverless9811]

At 6:00, you show both black and red coming from GND pins. Shouldn't the red come from 5V, and black at GND?

[@ArtedaSerenidadeEstoica]

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

[@Engineer9736]

9:11 You have a bug in your code. You check if Wire.available() is equal to or less than 2. This would also result in true if Wire.available() returns 1. Then you read 2 bytes in any case. In the case 1 byte was received, you are reading one other random unknown byte.

[@expectropetronus]

Simple and lucid explanation... Thank you

[@xealit]

6:05 the power and ground wires (red and black) are both connected to ground on the mega?

[@victorchan8685]

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

[@J-K-AG]

Great tutorial mate. Just wondering is there any tutorial on how to change address on unique slave devices.

[@J-K-AG]

No problem. Thanks for the video anyway really helpful.

[@astudyspace7272]

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

[@TheSateef]

thanks, can you tell me in the program you test for Wire.available=2?

[@spbains1966]

Excellent tutorial bringing out the details very clearly

[@lan5053]

So easy to understand. Thank you!

[@BlagojceKolicoski]

You have both VCC and GND connected to the GND on the Arduino @ 05:56. Is this a mistake?

[@121yahya]

very nice video, clear explanation and easy to understand

[@PiCoVienna]

Excellent, easy to understand, very precise!

[@chasenjohnson797]

Great description of I2C. Thanks:)

[@leuc2475]

Thank you. It's simple to comprehend

[@youseebruce5426]

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

[@ronimine]

Very clear and instructive. Well done. Thank you !

[@rajsudhirsaran312]

Very clear explanation

[@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

[@jokopribadi6462]

easier to understand in this video. Thanks

[@PhDFernandoCoach]

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

[@narendravasu6607]

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

[@iurifrederico8608]

Nice! Very good explanation! Well done 👍