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Re: ESP8266-01 : Connect a button on GPIO2

PostPosted: Mon Jun 08, 2020 8:13 am
by btidey
Is there a pull up resistor on the GPIO?

If not then when you release the button then the GPIO is essentially just floating and could be any value.

Either put a pull up e.g. 10K from GPIO to 3.3V or change the pinMode to INPUT_PULLUP. The latter will use an internal pull up of around 36K which is OK providing the leads to the button are reasonably short.