I have a ESP-8266-01 sitting in a relay-board. The relay is controlled by GPIO0.
The default level of this pin is HIGH, given by the HW design.
With the factory firmware this pin just gets to 5V.
However, when programmed with Arduino's IDE there is a kind of "initialization" and GPIO0 is pulled down.
And this level toggle triggers the relay and makes this board useless for serious usage like controllig
Any idea where to look for a way to disable this?