// Include the required libraries
#include <LiquidCrystal_I2C.h>

// Define the pins for the LED, light sensor, and motion sensor
const int LED_PIN = 13;
const int SENSOR_PIN = A0;
const int MOTION_PIN = 2;

// Define the threshold values for the light sensor and motion sensor
const int LIGHT_THRESHOLD = 500;
const int MOTION_THRESHOLD = 1000; // in milliseconds

// Define the break interval in minutes
const int BREAK_INTERVAL = 30;

// Initialize the LCD screen
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // Set the LED pin and motion sensor pin as an output
  pinMode(LED_PIN, OUTPUT);
  pinMode(MOTION_PIN, INPUT);

  // Initialize the LCD screen
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
 
 }

void loop() {
  // Read the value from the light sensor and motion sensor
  int lightValue = analogRead(SENSOR_PIN);
  bool motionDetected = detectMotion(MOTION_PIN, MOTION_THRESHOLD);

  // If the light value is below a threshold and motion is detected for threshold time, turn on LED and display break message
  if (lightValue < LIGHT_THRESHOLD && motionDetected) {
    // Wait for the break interval to be reached
    delay(BREAK_INTERVAL * 60 * 1000);

    // Turn on the LED and display a message on the LCD screen
    digitalWrite(LED_PIN, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Take a break now!");
    delay(60 * 1000);
  }
  else if (motionDetected) {
    // Display a message on the LCD screen if motion is detected
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Motion Detected!");
  }
  else {
    // Turn off the LED and clear the LCD screen
    digitalWrite(LED_PIN, LOW);
    lcd.clear();
  }
}

bool detectMotion(int pin, int threshold) {
  unsigned long startTime = millis();
  bool motionDetected = false;
  
  while (millis() - startTime < threshold) {
    if (digitalRead(pin) == HIGH) {
      motionDetected = true;
      break;
    }
  }
  
  return motionDetected;
}