Hi,

I made some tests on the ADC using a NodeMCU 0.9.5 build 20150318.
My code just reads the value on the pin every 500ms.

Using a Arduino program :

• pin A0 at GND --> analogRead(A0) = 700
• pin A0 at 3.3V --> analogRead(A0) = 909

I am surprised to have the value 700 when voltage on pin A0 is GND. Should be near 0.

I made the same test with a LUA program using ESPlorer.
The result is the following :

• pin A0 at GND --> adc.read(0) = 4
• pin A0 at 3.3V --> adc.read(0) = 1023

These last results sound good.

Does anyone have the same problem ?

Need something special to use the ADC pin ?

Thanks.