ESP8266 Community Forum

- Wed Jan 17, 2018 5:47 am #73215 Hi

How accurate is the esp8266 ADC pin ?

I am using the esp8266 on a wemos d1 mini board and have injected a voltage on the adc pin so the voltage
on the esp8266 A0 pin is 1.0 volt or as close I can measure it with my two meters. I have faith it should be close to 1 volt.

However, this seems to give readings of 957-962 on the pin read.

Does anyone know why this is not closer to 1024 ?

Thanks

- Thu Jan 18, 2018 4:01 am #73251 I solved this by updated the board library in Arduino ide to 2.40 . 2.30 was give poor readings.

Thanks