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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
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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]
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