Using the analog pin to control a relay?

[digicosmos]

Hi everyone!

In my ESP8266 project, I have used all available GPIO pins. Is it possible to use the analog pin A0 to control a relay? I have read somewhere that this pin supports digitalWrite. Is it possible to do that in MicroPython?

Thank you!

[deshipu]

It doesn't and it's not possible.

[Roberthh]

But you can use it as a slow input, polled by software, like for a switch.

[pythoncoder]

@Roberthh I think you may have misunderstood the original post. @digicosmos wants to re-purpose the pin as a digital output. I believe @deshipu is correct in his comment and that it's a limitation of the hardware rather than of MicroPython.

[Roberthh]

No, I did not misunderstand. My comment was, that if the poster has another digital pin, used as slow input, he/she could swap that with the analog pin. I did that once when I ran out of pins on a ESP8266. I used is for a "operation mode" switch.

[pythoncoder]

Fair point, although a pair of resistors should be used to limit the digital signal to the 0-1V that the ADC can accept.

[digicosmos]

Thank you too you all!