Datasheet

So to set the pin #0 LED on and off (which would be pin #3 in Lua) first make it an output:

Turn the LED on with:

And off with:

You can make this a little more automated by running a longer script.

For longer text, pasting can be difficult as the lua interpreter needs a little delay time between characters and also

require CR-LF settings. For that reason you may want to paste each line and then hit return manually.

The Lua documentation for the ESP8266 has GPIO #4 and #5 swapped so if #4/#5 aren't working for you, try

swapping!

Pin Notes PCB/Arduino NodeMCU/Lua

No pullups! 0 3

2 4

3 9

4 1

5 2

9 11

10 12

12 6

13 7

14 5

15 8

16 0

gpio.mode(3, gpio.OUTPUT)

gpio.write(3, gpio.LOW)

gpio.write(3, gpio.HIGH)