A0 pin number can be changed in the variants #4778
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The current version of
../generic/common.hdoes not allow to specify a different pin number A0 in the boards variants. This change will not affect the existing boards, but will allow to change A0 without duplicating the../generic/common.hcode.It is needed here #3916
and may help here https://github.com/esp8266/Arduino/blob/master/variants/wifio/pins_arduino.h