Hi! It seems that official ESP32 Arduino framework consists of broken I2C support. AFAIK GitHub - stickbreaker/arduino-esp32: Arduino core for the ESP32 fork has updated files for fixing ESP32 arduino I2C problems. Sorry for repeating my question from the previous topic: Is it somehow possible to…

http://docs.platformio.org/en/latest/platforms/espressif32.html#using-arduino-framework-with-staging-version