The voltage on analog pin is set with potentiometer. The values range from 0 - 1024, which is 10 bit resolution (for UNO)
To read analog values, we use analogRead(pin)
A0*(Vcc/1023.)
Vcc is 5V when the analog device is connected to 5V supply
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
// read the value of analog pin A0
// value ranges from 0 - 1024
// these values are changed by changing the knob of potentiometer
Serial.println(analogRead(A0));
}