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Topic starter
2020-09-27 10:46 am
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.
2020-09-27 10:55 am
@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.
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Topic starter
2020-09-27 11:36 am
@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.
2020-09-28 1:56 pm
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.
2020-09-29 11:08 pm
Logic level converter bi directional should work .
2020-09-30 12:11 pm
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.
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.
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Bill
"Never trust a computer you can’t throw out a window." — Steve Wozniak
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