I'm attempting to do the same thing. Is the code in the original post all that is needed? I have a NF-A4x20 5V PWM fan. I am not even sure if the esp32 can drive that thing. I already have the temp code and webpage on/off swatch working so I want to stick with the esp32. If the esp32 won't drive it ...

I was just coming here to say that I increased the stack size and it fixed the problem.
Is there a way to "know" what that setting should be? Can I set it for big and somehow see how much is being used?
Thanks for the help!!!
JohnnyG

I am trying to combine two separate ino's on an ESP32 with the Arduino IDE. The first ino uses a temp sensor to display the temperature on the serial monitor. The second uses wifi to create a webpage with an on/off link that will turn a relay on or off. Both ino's work separately but when combined, ...