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Onboard LEDs? NodeMCU's got two! – Low voltage. Mostly harmless...
NodeMcu (ESP8266) Tutorial A-02: Blinking internal LED - YouTube
ESP8266 IoT Based RGB LED Strip Controller | Circuits4you.com
nodemcu - Does the Node MCU v3 (LoLin) not have a builtin led? - Arduino Stack Exchange
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IoT Based LED Control using Google Firebase & ESP8266
