It's a hardware issue; the GPIO29 / ADC3 (VSYS) is dual-use on the Pico W and Pico 2W. You can only read VSYS on ADC3 when GPIO25 is high.
There is prior discussion in the forum, particularly in the MicroPython sub-forum.
There is prior discussion in the forum, particularly in the MicroPython sub-forum.
Statistics: Posted by hippy — Mon Jun 16, 2025 2:33 am