NodeMCU Pinout Reference | Microcontroller Tutorials
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![esp8266_gpio_pin_allocations [ESP8266 Support WIKI]](https://www.esp8266.com/wiki/lib/exe/fetch.php?media=pin_functions.png "esp8266_gpio_pin_allocations [ESP8266 Support WIKI]")
esp8266_gpio_pin_allocations [ESP8266 Support WIKI]
Controlling Arduino GPIO pins from Webbrowser | Random Codes - Elementz Tech Blog
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Using NODEMCU - ESP8266 Wifi board with Arduino IDE for IoT
