ESP8266 Community Forum

- Fri Oct 20, 2017 7:53 am #71017 pinMode(16, INPUT_PULLUP)

This does not work for pin 16. It is an exception. It does not have a pull up option, it has a pull down.

pinMode(16, INPUT) and use an external pull up resistor.

GPIO16 can be INPUT, OUTPUT, or INPUT_PULLDOWN_16

- Fri Oct 20, 2017 6:21 pm #71039 Please also have a read in our Wiki (see at the top of the screen), for information about the ESP's GPIO's.

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.