int readPin=A4;
int V2=0;
int delayTime=500;

void setup() {
  // put your setup code here, to run once:
pinMode(readPin, INPUT);
Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

V2=analogRead(readPin);
Serial.print(V2);
delay(delayTime); 
}