#define ldr A0      // Define the pin for the Light Dependent Resistor (LDR)
#define led 7       // Define the pin for the LED
#define buzzer 9    // Define the pin for the passive buzzer

void setup() {
  pinMode(ldr, INPUT);   // Set the LDR pin as input
  pinMode(led, OUTPUT);  // Set the LED pin as output
  pinMode(buzzer, OUTPUT); // Set the buzzer pin as output
  Serial.begin(9600);    // Start the serial communication at 9600 baud
}

void loop() {
  int valor = analogRead(ldr); // Read the value from the LDR
  int luz = map(valor, 0, 1023, 100, 0); // Map the value to a percentage (0-100%)
  Serial.print("Illumination at: ");
  Serial.print(luz);
  Serial.println("%");

  // If light level exceeds 100 lux, trigger alarm
  if (valor < 923) { // Check if the analog value corresponds to more than 100 lux
    digitalWrite(led, HIGH);   // Turn on the LED
    tone(buzzer, 1000);        // Generate a 1000 Hz tone on the buzzer
  } else {
    digitalWrite(led, LOW);    // Turn off the LED
    noTone(buzzer);            // Stop the tone on the buzzer
  }

  delay(1000); // Delay for 1 second before the next reading
}