I2C ESP32 Arduino Question - Help Wanted

RE: I2C ESP32 Arduino Question

DroneBot Workshop — Wed, 30 Sep 2020 12:11:34 +0000

Posted by: @madmisha

Keep in mind that the documentation for ESP32 is a little hazy on if it can take 5V logic. Some people say it can and some say you shouldn't.

Yes, it's a common discussion on the ESP32 forum.

Posted by: @duce-robot

Logic level converter bi directional should work .

Agreed! It's the Data line in this situation that is the problem, as the ESP32 is the master in your configuration the clock signal is fine. And the keyword in @duce-robot comment is "bidirectional", as the data needs to travel both ways.

😎

Bill

RE: I2C ESP32 Arduino Question

Duce robot — Tue, 29 Sep 2020 23:08:05 +0000

Logic level converter bi directional should work .

RE: I2C ESP32 Arduino Question

MadMisha — Mon, 28 Sep 2020 13:56:55 +0000

Keep in mind that the documentation for ESP32 is a little hazy on if it can take 5V logic. Some people say it can and some say you shouldn't.

RE: I2C ESP32 Arduino Question

KeithL — Sun, 27 Sep 2020 11:36:44 +0000

@byron - Well that was easy. I just watched the video and it would seem that my setup is fine as it is.

Thanks for pointing me in the right direction.

RE: I2C ESP32 Arduino Question

byron — Sun, 27 Sep 2020 10:55:11 +0000

@keith - there is a dronbot video on this sort of thing where an arduino 5v logic is connected to a rpi 3.3v logic, so similar considerations for your use case. Have a search on the youtube and you will find it.

I2C ESP32 Arduino Question

KeithL — Sun, 27 Sep 2020 10:46:05 +0000

I have an ESP32 connected to an Arduino Pro Mini via I2C. The ESP32 is the master and the Arduino is a slave.

The ESP32 is set up to request information from the Arduino and everything works okay.

My question is: As the ESP32 is 3.3v and the Arduino 5v, should I have a voltage level shifter on one, or both, of the I2C lines?

Although everything works okay at the moment I don't want to be slowly damaging the ESP32 with too much voltage.