// Define the analog pin for the potentiometer
int potPin = A0;

// Define the LED pins
int redPin = 11;
int yellowPin = 10;
int greenPin = 9;

// Voltage reference (in volts) for the Arduino, typically 5V or 3.3V
float voltageReference = 5.0;

void setup() {
  // Begin Serial Communication
  Serial.begin(9600);

  // Set the LED pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  // Read the potentiometer value (0 to 1023)
  int sensorValue = analogRead(potPin);

  // Map the potentiometer value to PWM range (0 to 255) for LED brightness
  int ledBrightness = map(sensorValue, 0, 1023, 0, 255);
  
  // Convert the ADC reading to voltage
  float voltage = sensorValue * (voltageReference / 1023.0);

  // Print the values to the Serial Monitor
  Serial.print("Potentiometer Reading: ");
  Serial.print(sensorValue);
  Serial.print(" -> Voltage: ");
  Serial.print(voltage);
  Serial.print(" V");
  Serial.print(" -> LED Brightness: ");
  Serial.println(ledBrightness);

  // Control the LEDs based on voltage
  if (voltage <= 1.5) {
    digitalWrite(redPin, HIGH);    // Red LED ON
    digitalWrite(yellowPin, LOW); // Yellow LED OFF
    digitalWrite(greenPin, LOW);  // Green LED OFF
  } else if (voltage > 1.5 && voltage <= 4.0) {
    digitalWrite(redPin, LOW);    // Red LED OFF
    digitalWrite(yellowPin, HIGH); // Yellow LED ON
    digitalWrite(greenPin, LOW);  // Green LED OFF
  } else {
    digitalWrite(redPin, LOW);    // Red LED OFF
    digitalWrite(yellowPin, LOW); // Yellow LED OFF
    digitalWrite(greenPin, HIGH); // Green LED ON
  }

  // Wait a bit before the next reading
  delay(500);
}