ESP8266: NodeMCU Pin mappings

I had some problems with this when I first used a NodeMCU board. It’s simple enough to figure out, but it still can give you a momentary urge to yank out hair!

Thanks for making this easy to see and understand!


The objective of this post is to explain how to use the ESP8266 library defined constants that have the correct mapping between NodeMCU and ESP8266 pins.

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