int potPin = A0;
int potVal;
float mapVal;
int dt = 250;
void setup() {
  // put your setup code here, to run once:
  pinMode(potPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  potVal = analogRead(potPin);
  mapVal = (5./1023.) * potVal;
  //  mapVal = map(potVal, 0, 1023, 0, 5); 
  Serial.println(mapVal);
  delay(dt);
}