RESET button doesn't work, gets stuck pressed

[xylo04]

In the current board layout, the WiFi reset button is connected to the ESP8266 GPIO 16 on one side, and through a 10k ohm resistor to GND on the other. The ESP8266 supports a digital pin mode called INPUT_PULLUP on GPIOs 0-15, and INPUT_PULLDOWN_16 on GPIO 16. The circuit as-is causes GPIO 16 to float and always register LOW after the button is pressed.

[xylo04]

We've pretty much used up the available GPIOs on the ESP8266. Maybe we can still use GPIO 16 but change R5 from a pull-down to a pull-up? Then we can use the INPUT_PULLDOWN_16 mode.

Breadboard testing suggests this will work. Change R5 to be connected to 3v3 instead of GND, put GPIO 16 in INPUT_PULLDOWN_16 mode, then check for when it goes HIGH.