Are the RPI and ESP32 sharing the same ground? Have you done a loopback test on the RPi to insure the RPi can send receive serial? Thank you a lot, it was indeed because RPI and ESP32 didn't sharing the same ground. I am a beginner in microcontroller, and I am not really used to the ground propriet...

Hello everyone, I am trying to use the Serial2 for UART communication with a Raspberry3. But I can't communicate anything, once I connect a wire to pin 16, Serial2.available() is trigger and send me noise. Even when the wire is not even connected to anything, or I just need to touch with my finger t...