ESP8266 pinout reference and how to use GPIO pins
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![Pin diagram of NodeMCU ESP8266.[6] | Download Scientific Diagram](https://www.researchgate.net/publication/347689883/figure/fig3/AS:974724557463565@1609403852391/Pin-diagram-of-NodeMCU-ESP82666.png "Pin diagram of NodeMCU ESP8266.[6] | Download Scientific Diagram")
Pin diagram of NodeMCU ESP8266.[6] | Download Scientific Diagram
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