Hey guys, try and figure this one out with me. I’m integrating the ESP32-C3 Xiao board into a design I have for temperature controlled storage box - essentially I have a bunch of mains relays operating a refrigeration compressor, ceramic fan heat, dehumidifier, based on temperature and humidity sen…

Something’s little odd there. Check your grounds :wink: Rather than rely on an AI response, I have just powered my XIAO ESP32 C3 with 5V on the VUSB (Pin14) and GND (Pin13), and as expected the 3V3 (Pin12) shows 3.3V and the GPIO has varying voltages never exceeding 3.3V. I have various GPIO conne…

4.9V on the 3V3 Output

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cgwaltney March 18, 2026, 11:05am 16