c++ freecodecamp course 10 hours youtube
int analogPin = 3;// potentiometer wiper (middle terminal) connected to analog pin 3
int val = 0; // variable to store the read value
void setup() {
Serial.begin(9600); // setup serial
analogReference(EXTERNAL); // the voltage applied to the AREF pin (0 to 5V only)
// is used as the reference.
}
void loop() {
val = analogRead(analogPin); // read the input pin
Serial.println(val); // debug value
}