int potPin = A0;
int potVal = 0;
float voltage = 0;
int ledPin = 9; 

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(ledPin, HIGH);
  delay(1500);
  digitalWrite(ledPin, LOW);
  delay(500);
  potVal = analogRead(potPin);
  voltage = potVal * (5.0 / 1023.0);
  Serial.print("Potentiometer Value: ");
  Serial.println(potVal);
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");
  analogWrite(ledPin, map(potVal, 0, 1023, 0, 255));
  delay(5000);
}