Arduino timer interrupt 82668/4/2023 That GPIO is called ADC0 and it is usually marked on the silkscreen as A0. The ESP8266 only supports analog reading in one GPIO. GPIO4 and GPIO5 are the most safe to use GPIOs if you want to operate relays. You can read this article that investigates the state and behavior of each GPIO on boot. The following GPIOs output a HIGH signal on boot:Īdditionally, the other GPIOs, except GPIO5 and GPIO4, can output a low-voltage signal at boot, which can be problematic if these are connected to transistors or relays. This may be problematic if you have relays or other peripherals connected to those GPIOs. There are certain pins that output a 3.3V signal when the ESP8266 boots.
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