#define vrPin 14        // VR connected to analog pin 14 on ESP32
#define relayPin 17     // Relay control connected to digital pin 17
#define buzzerPin 23    // Buzzer connected to digital pin 23

int vrValue = 0;             // Variable to store VR reading
int relayState = LOW;        // Current state of relay

void setup() {
  // Set the pin modes for the relay and buzzer
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  
  // Initialize serial communication for debugging
  Serial.begin(115200);
}

void loop() {
  // Read the VR value (0 to 1023 on analog pins)
  vrValue = analogRead(vrPin);

  // Print the VR value for debugging
  Serial.print("VR Value: ");
  Serial.println(vrValue);

  // Control the relay state based on the VR value
  if (vrValue > 50 && relayState == LOW) {  // Turn on relay if VR is above threshold
    digitalWrite(relayPin, HIGH);  // Turn on the relay (LED powered on)
    relayState = HIGH;  // Save the relay state
  } 
  else if (vrValue <= 50 && relayState == HIGH) {  // Turn off relay if VR is below threshold
    digitalWrite(relayPin, LOW);  // Turn off the relay (LED powered off)
    relayState = LOW;  // Save the relay state
  }

  // Buzzer alert at max or min VR positions
  if (vrValue < 50 || vrValue > 1000) {  // Thresholds for min and max VR positions
    digitalWrite(buzzerPin, HIGH);  // Activate buzzer
    delay(100);  // Brief alert duration
    digitalWrite(buzzerPin, LOW);   // Deactivate buzzer
  }

  delay(100);  // Small delay for stability
}