ESP8266 Community Forum

- Tue Dec 22, 2015 1:43 pm #36970 Did not seem to find this specific problem using forum search.

I have tried this with arduino ide 1-6-5 and 1-6-7.

Using nodemcu 1.0 and windows 7 64 bit

Using the following sketch instructions

const int buttonPin = 16;
pinMode(buttonPin,INPUT_PULLDOWN);


Gives this error when compiled:

'INPUT_PULLDOWN' was not declared in this scope

Don't understand the compiling error.

- Tue Dec 22, 2015 3:17 pm #36978 There is no INPUT_PULLDOWN define at all.
GPIO16 is an exception and it is the only pin having a pull-down, so the define is named INPUT_PULLDOWN_16.

- Wed Dec 23, 2015 1:52 am #37001 Thanks!

The reference on the 8266 says:

Digital pins 0—15 can be INPUT, OUTPUT, or INPUT_PULLUP. Pin 16 can be INPUT, OUTPUT or INPUT_PULLDOWN. At startup, pins are configured as INPUT.

Doesn't really clarify the INPUT_PULLDOWN_16 construction.

- Wed Dec 23, 2015 9:44 am #37011 The define for INPUT_PULLDOWN_16 is declared in the Arduino.h