Again, One of the channel who is explaining the things but for beginners it is hard to grasp whatever he did as he did not showed the connections.

Hey, guy with swiss accent. Your channel is very inspiring. Thanks for sharing your ideas!

I'm watching this in 2021 and its still valid. I must say Andreas that you sound more secure and energetic in your newer videos, so keep them coming!

Hey, guy with swiss accent, I've got an italian one.... I find very useful your teaching. Actually, I was used to plan experiments with Labview and NI instrumentation, I decided to leave both for open software and cheap devices, not only for economical concern. Thanxs for the wide presentations

For a few hours I have been struggling to get 2 screens working independently, not anymore!! Simple but effective, much simpler than what I was trying to do! Thanks :)

Just come back to this video today for a refresher, My God, how very different you sound today........... oh my, how you have grown in such a short period of time, quiet astonishing!! Pat on the back required :-)

This episode was simple and easy to understand, even for a electronic novices like me. My main goal as a RC enthusiast is to better understand how I can utilize the I2C protocol on the flex port of my cc3d flight controller. You did a great job at explaining in detail!!!

Thanks for the quick video. I am doing a project with an OLED, Temp sensor, and ADXL345 sensor and was wondering about how to build the bus, so your example did give me some ideas.

I love the way you talk. It made it a lot better to understand. I subscribed.

thanks, helpful video even 8 years later

Nice job explaining the theory behind I2C without getting caught up in code

Great video. Good for esp8266. There is also a board with ads1015 to extend the pins available on esp8266 using I2C. Good topic for video too :)

Very helpful, many thanks for putting the time into this!

How can i say thank u....🙏🙏 THANKS from the heart💚 Your experience and way of explaining....nut shell like me too understand... ( thank u internet & many unknown people across the world helps me to learn ) Thank U sir..

Hello Andreas, I am completely new to these type of displays and sensors but I must say that your videos are the best I have found to help me learn. I want my first project to have 2 or 3 0.96 OLed displays, each showing a different sensor output, like temp and humidity on one, time and date on the next, and on the third maybe a spectrum analyzer. Watching your videos has given me the confidence to try. I do have one question though. On this video you talk about making an IC2Bus, what is a IC2 Bus and how did you make them, that part of the video went by a little too fast for me.Thank you from a fan.

Great info thank you. I am making a retrofitable shot timer for a multi group espresso machine. Each group has a counter display triggered by sensing the valvle solenoid current. the display of the group counts in seconds and stops when the group is released. Its the in thing to know how many seconds you require to deliver a shot ie 25-30ml should be around 20-25 sec this is affected by the grind and the coffee freshness. Anyway with all displays on one bus its much easier for me to add displays depending on how many groups the machine has so your video has helped me no end thank you

Andreas, das ist eine tolle Info, danke!

Super Channel, vielen Dank für die tollen Tutorials!

Das Video war wunderbar! I was intersted in connecting multiple devices to a single Arduino and came across your video. Very informative. Thank you a lot. By the way, how many devices (practically) can run a single Arduino nano?

very clear and thorough . i like how you did the bus. i think the fastest i have pushed a UNO and Nano was 400hz in I2C . for most things its 1 line of code . i was driving 2 dual Adafruit stepper motor control boards and a OLED on 1 buss .

Thanking the gods for guys like you helping me out with my project (y)

I love abbreviations that are no shorter than what they're meant to stand in for.

First of all, love your channel, really eye opening and you do go into so much details. I'm wondering how to connect a single Arduino Mega to one I2c Bus to conect to multiple sensors (eg room temperature sensor, water temperature sensor, humidity sensor, automation of pumps in real time and storage of data as well as writing the sketch for them. Thanks in advance

Thanks for sharing and putting a very informative presentation. I truly learned something. - Cheers -

so many great videos, thank you for your time and afford.

Nice and simple explanation !!!

Much appreciated AND educational. - Bill

Hello I appreciate your content, I am building a weather station with rtc clock, humidity sensor and lcd , tree of them use I2c but sometimes when I reflush the program or turn off and on the esp8266 , the i2c does not work. May you help me with this issue ? thanks

Have you ever considered becoming a teacher? ☑ 'Put you to sleep' cadence ☑ Tell - Don't show ☑ Use abstract/boring diagrams ☑ uninteresting graphics to linger way too long You hit all the checkboxes - Bravo!

Thank you. That is what I was looking for.

Doctor Goggle hahah Nice! very informative ! I learn more in 7 mins with your explanations then I did with Dr Goggle.

Great video and all the other videos as well. Instead of making a home made hub, can we use TCA9548A multiplexer which I read can be useful even in an address conflict situation? I am using 4 x sensors all with different addresses.

Is it possible to connect multiple TSL2591 to one arduino? they have the same address, but it can't be changed right?

Hi, A very helpful video, thank you! I am trying to use two accelerometers MPU6050 with an Arduino nano that only has one port for SCL and SDA, but I am confused because in some forums say that is needed to add pull-ups resistors with each SCL and SDA, is that right? Because how you doing it you don't need the resistors and looks easier! Thank you!

Hi Andreas, I do not know how many, but I have watched A LOT of your video's. CHEERS for the good work you do!!! always well presented!!! I have a question. Can one add libraries, initialise peripherals (LIKE LCD) or restart a device from code without resetting the arduino? Lets say my LCD lost sync because of momentary power loss, how can I get this going again with code?

excellent explanation!!! and great video

I have a question and i hope i can find an answer basically we directly connect all the scl and sda pins in the same connection? like the wires are connected together of the Oleds and the they are connected directly to arduino scl and sda?

I'm working on a 4wd robot car using Arduino Mega. I am trying to synchronize the speed of all 4 wheels of the robot. I intend to read the motor speed from each motor using an AS5600 hall sensor. That means 4 hall sensors in all. I also realised the arduino mega has only one sda and scl pins so this tutorial is helpful. Can you also help me with more tips and advise on how to go about it? Thanks

i love this video. never expect this would work against being homesick.

I have a project where Im interfacing with at least 12 arduinos 1 being the Master .I think I have to use pull ups for power or a main power hub for all the arduinos . I like the part in the video about finding the names of each and having to write the code for each one ,,,trust me its just as bad as Im explaining it I already have a head ache lol. thanks for the video

I2C is good, but using with laser sensor there is a short limit on cable lenght. How can we extend it? I wonder using RS485 open colector hardware, if it possible or not?

Hey Andreas, I just remembered 5 years later you had a video just like this, I'm planning to have an ESP32 master with ATTINY85 slaves, which each will take an analog input from a soil moisture capacitive sensor, I'm planning to do an array of these bundles for some plant pots and monitor each of them, and have the information sent through the same bus. Is it possible to assign an address to all slaves and access them in the order I prefer? And what would be a good method to buffer the I2C bus in case my cables are getting too long? Would really appreciate a reply from you, and thank you for all the content you upload, it's really interesting

thanks so much - you've gpot me on the right track!

great video how would i connect one current sensor to measure the variables from different devices e.g power supply,solar panels etc

Thanks. Scanner is really helpful too. : )

Excellent sir

Great video! Can I use 16 Oled displays with this technique?

Hi, thanks for your sharing, it helps a lot. I’m trying to connect to two identical sensors in one arduino board and print it out the same time (max30102). And i’m having trouble with how to print both value in serial printer separately. How do i write them on the code? Thanks.

love your videos! thank you

Hi Andreas. Thanks for a great video - Do you have any information video how to use MultiMaster on I2C? Maybe some code examples?

Thank you so much for this informative video. I am planning on putting together the following on I2C Bus: DS3231 (RTC), BMP180, and ESP8266. Do I need to worry about adding or disabling pull-up resistors for this setup? Thanks in advance! Cheers from Maryland, USA.

Hello, thank you for your videos ! I would like to make a big i2c bus (around 50m long and around 100 sensors max) for domotics (the bus will be in the walls so I would like to not have to replace the bus). What is the ideal section of the bus wires ? Do I need one or more bus extender to increase the range/stability ?

I am going to be connecting a gy9255 motion sensor and a BME280 to a 3.3 V PRO MINI. I have added pull up resistors but do I really need to? Thank you for your very helpful videos.

You are life saver!!!

Great Video! One question: I need to use an Arduino with many identical motor shields (It will have more motors than one shield can handle). How do I change the address of the motor shields so they are not identical? Any ideas? Thanks!

Again, great information in this video. Are you able to share the setch for this project as I have all the components and would like to build it. Also thanks for the link to the I2C Scanner. Very handy.

Hi andreas! Thanks for sharing all your knowledge. I'm working in a project with three i2c devices connected to the arduino. For now i'm working with only 2, an oled display just like the ones you used here, and a MPU6050 accelerometer module. The problem is that I'm using a library to deal with the display (OLED_I2C.h), and other libraries to deal with the accelerometer (I2Cdev.h and MPU6050.h) wich depend on Wire.h. I think the use of the bus by these libraries are in conflict because they work separately but not together. What do you suggest?

Hi! I am new to arduino, and I have a project that need to connect multi Tof10120 sensor in one UNO and I am quite confused right now. May I know where to start or would u kindly give me some advice? Thanks!

Great video. Quick question, do you need to add pull up (or pull down) resistors for SCL and SDA?

hello from Portugal. i just watched your video to ltry to learn something more about i2c. the main reason is to make some i2c devices work on flight controller i2c bus. i have some detected in betaflight and some detected in inav. i know devices are working, but not correctly deteted and i dont understand, why? i bet is fw related issue

how do i connect max30100 & adxl345 both with arduino to get the data from both sensor. please help me.

New to Arduino and this was great! Can I ask what you were using for pressure and temperature display?

I hope you will reply :) , I use 5 arduinos displays 5 sensor values on single i2c display it is situated 12 foot from arduinos , but at the display i want to tap data coming to display and serial print on arduino connected for tapping data it display address is 0x27 is it possible?

Hi great videos Just a question. Is it possible to connect 2 or more 16x2 lcd display and give them different messages

Like all of your videos, also this one is very educational. Thanks for uploading!! But how do you approach the problem if you want to transfer 128 bytes from a slave node to a master (e.g. Arduino or Teensy)? Do you know of any link that might help me with a code fragment?

thanks for such an awsome video. i wish to know if i need data from two sensors simultaneously, how would it be possible. i need this data then transferred to excel

Hello, I am new in Arduino and I was wandering if using I2C Bus I can connect together 15pcs DHL22 sensors, 10pcs MQ2 sensors, 5pcs flame sensors,......and I will stop here. Basically I am trying to create an automation for a new house. I would like to monitor temperature, humidity, gases, fire detection, blind open/close, dimmable light, some proximity sensors to detect if doors are open or closed. Is this possible as DIY or I am dreaming to big?

Hello, I wanted to connect arduino micro (Master) to arduino nano(slave) and LCD I2C (Slave), both need SDA and SCl, is it possible to do it? Been searching around for quite a while now. Pls let me know thank you

Could you throw some light on the "home-made" I2C device you created using male headers. How does it act as a I2C device? Thanks.

I connected two oled display with same model....ssd1306....I tried to display two different things in each. But the i2c scanner shows only 0x3c address....I connected all the wires in same port for both displays.....help

theres some website i went to that has all the latest devices listed with how to's on how to connect them Wi-Fi ect......

Beautiful Video, very interesting. I wanted to ask if it was possible to manage 32 relays over WiFi with more MCP23017. Thank you very much for the attention.

Thanks for your video. Now I am wondering if I have 2 same sensors and want to connect to just one Arduino board, How can I change the address of those sensors. Can you make another video about how to do it?

Does any one know how to identify and change address on the same modules such as VL53L0Xs? The problem with using I2C on the same type of module is that all of the same modules has the same address, which Arduino thinks it is reading only one device. I don't know how to change the addresses from hardware to different address in software. For example: VL53L0X has address of 52. If I connect six VL53L0Xs on I2C, the Arduino UNO recongnizes as one VL53L0X, instead of six. Therefore, I need to change all VL53L0X as V1 = 01, V2 = 02, V3 = 03, V4 = 04, V5 = 05, V6 = 06. I can try to use onboard pins to designate them as pin2 = SCL, pin3 = SCA, pin4 = SCL, pin5 = SCA, etc...; but this method leaves me with short on pins for other modules. I also try PCA9685 PWM, but it still read the same address. UPDATE: This link solves my problem: forum.pololu.com/t/multiple-vl53l0x-code-and-wiring-with-distance-reading/12609

Great information. I want to use 9 Laser measuring sensors ( VL53L0X sensor ) in 1 Arduino mega controller. I need to see the results and read them at the same time. how possible?

Hallo! Does the I2C bus need independent power supply? I don't think that a single Arduino Uno's power will be sufficient for multiple devices.

Thank you Sir.

Hi Andreas,I'm in the process of building a heat exchanger that requires 45 SHT31 sensirion sensors to measure temperature and humidity accurately. The sensors have i2c and voltage output capabilities. I prefer to use i2c, but would I be able to connect this many sensors? Also, I'll need the wires to run from within the tubes to the outside of the heat exchanger to the controller i.e. arduino, rasberry pi etc. The maximum length of cable is 900mm. Would this distance be of concern i.e. noise, interference etc? I'm not worried about cost, but would like to purchase equipment that would definitely work for my project. I would appreciate your thoughts. Regards,Viktor

excellent work. awesoma

how do you know what device just by hex key?

I might miss it..but do u have the wiring connection please

I really appreciate it your video

Sir, i need to interface three DAC modules with arduino that will produce sine waves at 120 degree phase shift with variable frequency. . I m bit confused with it.. can u help me kindly? ::")

Hi, I tried to use your i2c Scan, but not compiling. Error is: Arduino:1.8.7 (Mac OS X), Tarjeta:"NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Enabled, 4M (3M SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 115200" /Users/manuelcastillo/Documents/Arduino/i2c_scan/i2c_scan.ino: In function 'void I2Cscan()': i2c_scan:171:7: error: 'TWBR' was not declared in this scope TWBR = (F_CPU/(speed[s]*1000) - 16)/2; ^ exit status 1 'TWBR' was not declared in this scope I use a ESP8266 Lolin v3. I need use 3 devices with i2c. Help me, please.

Andreas it was intuitive . gave me a lot of insite and I am on the gateway to build the robotic suit for my grand child ,, as he has walking issues. Uncle google has many sketches for IMU 6500 but all of them give errors and are erratic. In my project there are 6 steppers for ankle knee and thigh and one for the back swing left right front back as he is not stable. will be using imu for his stability and will manage his walking . It is a difficult project and will need your generous input for using the i 2 c as there are too many things to take care of 3 imu units 8 steppers and walking route en turn around sitting standing etc etc. I am hoping for a generous Charity of knowledge Please

Sir I am a big fan of your blog. Presently I'm working on a project called gesture glove. In this project i want to integrate 5 MPU-6050 Sensors. The problem is I could connect only 2 MPU's, as MPU-6050 has only 0x68 and 0x69 addresses. Could you please tell me how to connect 5 MPU's to one arduino nano using i2c bus process.

Wegen deinem starken Akzent habe ich schon fast gedacht dass du deutsch sprichst

couldn't you have done this project without a I2C Bus? Newbie at arduino and electronics in general, discovered I2C and I have a lot of interesting Idea that I don't know how to execute

i need to monitor 100 DS18B20 temperature sensors using a central arduino. is it possible..? if yes, please help me out.

I tried connecting 2 I2C devices (which are same), but in the scan it shows only one address. So is it normal?

thanks for the tutorial from chania crete....

awesome man

Back again

@andreas Spiess, Please show me, how many LCD i2c can connect with Arduino Mega2560. I want connect with 14 lcd I2C, how to promotion. Thanks

woah what happened, it sounded like the speed of your voice and excited had been slowed down, look forward to normality soon

Hello! We are working on a project using two mpu6050, temperature sensor, and a pulse sensor. How to put these all together into one Arduino Nano? Please help us. Hoping for your answer. Can we talk thru e-mail? :)

Hi, I saw you have built your own i2c sensor with 3 ultrasonic sensors. But you did some programming on atiny, soldering and so on. Just wondering, if there are already build "converters/adapters" or something like this for regular sensors like "Soil Humidity Sensor" (lets say this goo.gl/RS92Fx). Thanks!

Thanks for teh Video, I wouldlike to connect 3 3-D accelerometers MPU6050 to one arduin using I2C Bus how can I do it

Maestro!!

can I use 2 INA219 on 1 I2C Bus using ESP32?