So I wasted half a day on a ESP32 project I’m tinkering with because I moved from a Node32S to a Heltec WiFi unit. They’re both ESP32-WROOM chips but I think the Heltec’s built-in OLED must have been competing with the pins I was trying to use.
But on the Node32S version? Works great, which is maddening, because it’s not documented anywhere that I can find.
When dealing with a chip board or even an Arduino that has a shield, how do you go about determining which pins are free for use? I mean I can look at the datasheet, and it shows pin 18 as a GPIO. That means I should be able to use it… but no.