#define LED_PIN 8
#define BUZZER_PIN 6
#define RELAY_PIN 10
#define POT_PIN A0

float voltage = 0;       // measured voltage
float threshold = 5.0;   // threshold voltage

void setup() {
  Serial.begin(9600);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
}

void loop() {
  int sensorValue = analogRead(POT_PIN);  // 0-1023
  voltage = sensorValue * (5.0 / 800.0); // map to 0-5V

  Serial.print("Voltage: ");
  Serial.println(voltage);

  if(voltage > threshold){
    digitalWrite(LED_PIN, HIGH);       // LED ON
    digitalWrite(BUZZER_PIN, HIGH);    // Buzzer ON
    digitalWrite(RELAY_PIN, HIGH);     // Relay ON
  } else {
    digitalWrite(LED_PIN, LOW);        // LED OFF
    digitalWrite(BUZZER_PIN, LOW);     // Buzzer OFF
    digitalWrite(RELAY_PIN, LOW);      // Relay OFF
  }

  delay(200); // 200ms loop delay
}