Onboard LEDs? NodeMCU's got two! – Low voltage. Mostly harmless...
Blink external LED using ESP8266 NodeMCU – IOT – Building Reliability
LED status light of nodemcu esp8266 · Issue #2313 · esphome/issues · GitHub
ESP8266 : Make an LED blink from the Arduino IDE - Hackster.io
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NodeMCU Tutorial Series Part I: Arduino IDE and Blinking an LED — Maker Portal
NodeMCU Tutorial Series Part I: Arduino IDE and Blinking an LED — Maker Portal
LED status light of nodemcu esp8266 · Issue #2313 · esphome/issues · GitHub
