ESP8266 NodeMCU Digital Inputs and Digital Outputs (Arduino IDE) | Random Nerd Tutorials
Amazon.com: NodeMCU ESP8266 Development Board with 0.96 Inch OLED Display, CH340 Driver, ESP-12E WiFi Wireless Module, and Micro USB Works Great for Arduino IDE/Micropython Programming (Pin Header Soldered) : Electronics
ESP8266 Pinout Reference - Last Minute Engineers
Nodemcu ESP8266 Pinout, Features, and specifications