#include <Wire.h>
#include <LiquidCrystal_I2C.h> // Include the LiquidCrystal library for I2C interface

// Constants
const int motionSensorPin = 34;
const int ledPin = 27;
const unsigned long lightDelay = 5000; // Time in milliseconds (5 seconds)
const unsigned long firstThreshold = 3000; // Time in milliseconds (3 seconds)
const unsigned long secondThreshold = 6000; // Time in milliseconds (6 seconds)
const unsigned long thirdThreshold = 10000; // Time in milliseconds (10 seconds)

// Variables
unsigned long lastMotionTime = 0;
bool isLightOn = false;
int percentage = 0;

// LCD module configuration
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Set the LCD I2C address to 0x27 and number of columns and rows

void setup() {
  pinMode(motionSensorPin, INPUT);
  pinMode(ledPin, OUTPUT);

  // Initialize the LCD module
  Wire.begin();
  lcd.begin(16, 2);
  lcd.print("Motion Sensor");
  lcd.setCursor(0, 1);
  lcd.print("Status: OFF");
}

void loop() {
  // Check for motion
  if (digitalRead(motionSensorPin) == HIGH) {
    lastMotionTime = millis();
    if (!isLightOn) {
      // Turn on the light
      digitalWrite(ledPin, HIGH);
      isLightOn = true;

      // Update LCD display
      lcd.setCursor(0, 1);
      lcd.print("Status: ON ");
    }
  }
  
  // Check if the light should turn off
  if (isLightOn && millis() - lastMotionTime >= lightDelay) {
    // Turn off the light
    digitalWrite(ledPin, LOW);
    isLightOn = false;

    // Update LCD display
    lcd.setCursor(0, 1);
    lcd.print("Status: OFF");
  }

  // Check if motion sensor is blocked
  if (digitalRead(motionSensorPin) == LOW && isLightOn) {
    // Calculate the duration of blocking the sensor
    unsigned long duration = millis() - lastMotionTime;

    // Determine the percentage based on the duration
    if (duration >= thirdThreshold) {
      percentage = 100;
    } else if (duration >= secondThreshold) {
      percentage = 66;
    } else if (duration >= firstThreshold) {
      percentage = 33;
    }

    // Update LCD display
    lcd.setCursor(0, 0);
    lcd.print("Sensor Blocked");
    lcd.setCursor(0, 1);
    lcd.print(percentage);
    lcd.print("% full       ");
  } else if (!isLightOn) {
    // Motion sensor not blocked
    lcd.setCursor(0, 0);
    lcd.print("No Obstruction ");
    lcd.setCursor(0, 1);
    lcd.print("               ");
  }
}