Onboard LEDs? NodeMCU's got two! – Low voltage. Mostly harmless...
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LED Blinking using ESP8266 - NodeMCU
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NodeMCU ESP8266 Pinout, Specifications, Features & Datasheet
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NodeMCU Basic Project-Blink a LED - Instructables
NodeMCU Basic Project-Blink a LED - Instructables
Simple Led Control With Blynk and NodeMCU Esp8266 12E : 8 Steps - Instructables
