ESP8266 Community Forum

- Sun Nov 15, 2015 3:33 pm #34105 9 and 10 are connected to the flash storage chip and should probably not be used.

i believe that 16 is used for the sleep mode and should also be avoided.

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- Sun Nov 15, 2015 3:37 pm #34106 ok thanks, GPIO 9 and 10 don't seem to be defined in the source even, GPIO-16 maps to D0

https://github.com/esp8266/Arduino/blob ... uino.h#L37