ESP8266 Community Forum

I assume he is referring to the Wemos D1 (Uno size) board.

Unfortunately these boards (like nodemcu) use different pin names.

So most likely he wants to change mode of D8 [pinMode(D8, OUTPUT);] and not gpio8 [pinMode(8, OUTPUT);] ... provided the correct board is selected in general.

Hello, I was getting the same wdt reset error while trying to use pinMode with digitalWrite() function.
I solved it by figuring out how the Wemos Pin mapping works.
Actually, you need to refer the pin in 'Dx' notation.
e.g

or


Also, make sure to select "Wemos D1 R1" in Tools > Boards so that Dx constants will match
the labels.