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Tweaking4All.com - Getting started with the ESP8266 as an Arduino replacement
Onboard LEDs? NodeMCU's got two! – Low voltage. Mostly harmless...
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How to blink a D1 Mini onboard LED (Windows, 7 Steps) – desertbot.io
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ESP32 LED blink tutorial using ESP-IDF FreeRTOS framework. - C2P Labs
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NodeMCU Basic Project-Blink a LED - Instructables
How to Blink a LED with ESP8266 NodeMCU
