ESP8266 Community Forum

- Tue Oct 03, 2017 2:41 am #70567 Update:

After I started this thread, I searched the internet a little further. My problem seems to be that the GPIO on ESP8266 does not actually have analog input. I need to use the ADC pin, and this is not present on the ESP8266-01 I was playing with.
I'll try using a "bigger" (07..12) version, where the ADC pin is exposed.

Thanks

Lars Bo Wassini

- Sat Oct 07, 2017 7:30 am #70666 I found a solution!
This is also working for ESP8266-01

Code: Select allADC_MODE(ADC_VCC);      // voltage sensor
int vcc;

void setup() {
...
}

void loop() {
   vcc = ESP.getVcc();

    double dvcc = (float)vcc / 1000;
    Serial.println("Voltage: " + String(dvcc,3) + "V");
}


Thanks

Lars Bo Wassini

- Sat Oct 07, 2017 9:05 am #70673 not quite, the voltage is value/1024 according to sdk documentation.

- Sun Oct 08, 2017 1:33 pm #70719

not quite, the voltage is value/1024 according to sdk documentation.

Aha! Thanks!

Thanks

Lars Bo Wassini