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I think I use all usable GPIO pins. GPIO 0 is strapping pin. GPIO 34 & 35 are input only. I need to remove GPIO 2 temporary during firmware upload but it
ESP8266 pinout reference and how to use GPIO pins
nodemcu v2 pinmapping are outputting to the wrong pins · Issue #584 · esp8266/Arduino · GitHub
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ESP8266 Pinout Reference - Last Minute Engineers
ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
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NodeMCU Pinout and ESP-12E Pinout | Pin Description, Peripherals
GPIO pins of ESP8266 and How to use efficiently -IoTbyHVM
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ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
ESP32 Pinout Reference - Last Minute Engineers
ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
