minor update: in case anyone stumbles across this, on the arduino-esp side, perhaps this could help in recovering the bus after something goes wrong... i expect a similar solution exists on the idf side where one could call the lower level reset if things hang up. i haven't dug into the i2c librarie...

Can you clarify that the I2C apps you are trying to run are hosted within the ESP32 Arduino framework as opposed to the ESP-IDF framework? If so, then we probably want to move this thread to the Arduino sub-forum. It has been my understanding that the I2C driver implementation for the ESP32 Arduino...

Do you have a $10 logic analyzer in your possession? I have found these to be invaluable when tracking down I2C puzzles and whole heartedly recommend one. With one of those, you can look at the SDA and CLK lines and unambiguously see what is actually happening. Yes, I have a bitscope micro and usin...

I've been trying to use the I2C for a number of digital sensors. They're generally 3.3V-5V capable, and for the 5V ones, I have a mosfet-based bi-directional level shifter. Just testing the port using the arduino i2c scanner example and have it compiled+flashed via the Arduino IDE using the latest A...