int analogPin = A0;
float V2;
int dt = 500;
int AnalogVal;

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

void loop() {
  // put your main code here, to run repeatedly:
AnalogVal = analogRead(analogPin);
V2 = (5.*AnalogVal) / 1023.;
Serial.println(V2);
delay (dt);
}