Thank a lot for you answer @ESP_krzychb i will try your suggestion to see if solves my problem

The situation is as described in the following diagram. In case A the ESP32 is powered using USB from the computer everything works properly but the i change to case B powering the ESP32 using a power supply via VIN pin serial communications between ESP32 and Arduino stops working. There is not any ...

Hi everyone, I have developed my code that runs on an esp32doit-devkit-v1 board and it works correctly if I power it through the UBS connector. However when I power the board using the VIN pin it stops working correctly. The problem that appears is with serial port 2. Does anyone know what may be ha...