ESP8266 Community Forum

Posted: **Tue Oct 03, 2017 2:41 am**

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.

Posted: **Sat Oct 07, 2017 7:30 am**

I found a solution!
This is also working for ESP8266-01

Code: Select all

ADC_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");
}

Posted: **Sat Oct 07, 2017 9:05 am**

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

Posted: **Sun Oct 08, 2017 1:33 pm**

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

Aha!

Thanks!

ESP8266 Community Forum

ESP8266-01 - voltage meter using GPIO0

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