ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
Arduino-er: Blink NodeMCU on-board LED using Arduino IDE with ESP8266 core for Arduino, and more examples
NodeMcu (ESP8266) Tutorial A-02: Blinking internal LED - YouTube
Basic ESP8266 NodeMCU tutorial: Breadboard, Pinout and Dimmable LED with Pulse-Width Modulation (PWM) - Mechatronics Blog
nodemcu - Does the Node MCU v3 (LoLin) not have a builtin led? - Arduino Stack Exchange
ESP8266 NodeMCU PWM with Arduino IDE - Dim LED (Analog Output) | Random Nerd Tutorials
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