Blink external LED using ESP8266 NodeMCU – IOT – Building Reliability
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ESP8266 - Control an External LED Over Internet - Hackster.io
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Complete Pinout reference guide for Nodemcu DIY Development board
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nodemcu - Does the Node MCU v3 (LoLin) not have a builtin led? - Arduino Stack Exchange
ESP8266 Node MCU board specifications and pins descriptions. Frequently asked questions related to WI-FI board esp8266 node MCU
Tweaking4All.com - Getting started with the ESP8266 as an Arduino replacement
