Yes. I really appreciate your help. Thank you very much. I think the key point that I was missing -- and seems apparent now, but was just not seeing before -- is that if a GPIO pin is not marked as associated with ADC1 or ADC2, eg the pins I was having trouble with: Pin 5 Pin 16 Pin 17 Pin 18 Pin 19...

Sorry for being unclear. When I say "pin" I'm referring to GPIO pins

Thanks very much for your reply. I think I may have misunderstood the pin configuration explanation. I tested what I believe to be all available GPIO pins except strapping, flash, and uart (in my previous wiring some were working as digital inputs, so had not tested as analog inputs): Pin 0: (skip) ...

Greetings! This feels like a trivial question, but I've struggled with it for days and am completely out of ideas. I've got some ESP32 DevkitCs from Amazon (https://smile.amazon.com/gp/product/B0718T232Z) and am testing with the Arduino IDE (set to Board: "ESP32 Dev Module"). When I analogRead GPIO ...