/*
 * Photoresistor Light Sensor with Arduino
 * This code reads light levels from a photoresistor (LDR)
 * and displays the values on the Serial Monitor
 */

// Pin definitions
const int PHOTORESISTOR_PIN = A0;  // Analog pin for photoresistor
const int LED_PIN = 13;             // Built-in LED pin

// Variables
int lightValue = 0;                 // Variable to store the light reading
int threshold = 500;                // Threshold value for LED control

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Set LED pin as output
  pinMode(LED_PIN, OUTPUT);
  
  Serial.println("Photoresistor Light Sensor Initialized");
  Serial.println("Light Level | Status");
  Serial.println("-------------------------");
}

void loop() {
  // Read the photoresistor value (0-1023)
  lightValue = analogRead(PHOTORESISTOR_PIN);
  
  // Print light level to Serial Monitor
  Serial.print("Light: ");
  Serial.print(lightValue);
  Serial.print(" | ");
  
  // Determine light condition
  if (lightValue < 300) {
    Serial.println("DARK");
    digitalWrite(LED_PIN, HIGH);  // Turn LED ON in dark
  } else if (lightValue < 700) {
    Serial.println("DIM");
    digitalWrite(LED_PIN, HIGH);  // Turn LED ON in dim light
  } else {
    Serial.println("BRIGHT");
    digitalWrite(LED_PIN, LOW);   // Turn LED OFF in bright light
  }
  
  // Wait before next reading
  delay(500);
}