Amazon.com: SNCT D1 Mini ESP8266 ESP-12 ESP-12F 4M Bytes CH340G CH340 V2 USB WeMos D1 Mini Compatible WiFi Development Board NodeMCU Lua IOT Board 3.3V with Pins (Pack of 5) : Electronics
esp8266_gpio_pin_allocations [ESP8266 Support WIKI]
ESP8266 Pinout Reference - Last Minute Engineers
NodeMCU ESP8266: Details and Pinout : 11 Steps - Instructables
ESP8266 NodeMCU pinout for Arduino IDE - Mechatronics Blog
ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
NodeMCU - Wikipedia
Using NODEMCU - ESP8266 Wifi board with Arduino IDE for IoT
Amazon.com: ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module for WeMos Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (5pcs) : Electronics