#define LDR_PIN A0      // Photoresistor connected to analog pin A0
#define LED_PIN 9       // Main LED connected to digital PWM pin 9

void setup() {
  pinMode(LDR_PIN, INPUT);           // Set LDR pin as input
  pinMode(LED_PIN, OUTPUT);          // Set LED pin as output
  Serial.begin(9600);                // Initialize serial monitor for debugging
}

void loop() {
  // Read ambient light level from LDR
  int ldrValue = analogRead(LDR_PIN);                
  int ledBrightness = map(ldrValue, 0, 1023, 255, 0); // Map LDR value to LED brightness

  // Adjust main LED brightness based on ambient light
  analogWrite(LED_PIN, ledBrightness);               

  // Limited debug output to reduce delay in Serial communication
  if (millis() % 1000 == 0) { // Print only every 1 second
    Serial.print("LDR Value: ");
    Serial.print(ldrValue);
    Serial.print(" | LED Brightness: ");
    Serial.println(ledBrightness);
  }

  delay(10);  // Reduced delay for faster response
}