ESP8266 pinout reference and how to use GPIO pins
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![NodeMCU ESP 12 and the pins configuration [26]. | Download Scientific Diagram](https://www.researchgate.net/publication/356769362/figure/fig3/AS:1098484388233216@1638910495257/NodeMCU-ESP-12-and-the-pins-configuration-26.jpg "NodeMCU ESP 12 and the pins configuration [26]. | Download Scientific Diagram")
NodeMCU ESP 12 and the pins configuration [26]. | Download Scientific Diagram
ESP8266 Pinout Reference: How To Use ESP8266 GPIO Pins
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