int readPin = A5;
float calcVal;

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:
calcVal = (5.0/1023.0) * (analogRead(readPin));
Serial.println(calcVal);
delay(500);
}