ESP8266 Community Forum

- Mon Feb 07, 2022 9:03 am #93583 Since 8266's analog port can only measure up to +1V, how do I protect the pin from excess voltage beyond +1V? I don't know of a 1V Zener!
Will the port be damaged if a 3.3V is applied? Or does it read 1023 all the time after it passes the +1V maximum?
Thanks.

- Thu Feb 17, 2022 6:03 am #93676 Hi, I think you may get your answers from this battery voltage measurement with ESP8266 tutorial. Basically, you need to make a voltage divider circuit.
https://www.engineersgarage.com/nodemcu ... e-monitor/