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ESP8266 ADC Tutorial | NodeMCU ADC for Analog Input Arduino IDE
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
esp8266_gpio_pin_allocations [ESP8266 Support WIKI]