#include <LiquidCrystal_I2C.h>
#include <Wire.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

const int tempPin = A0;
const int pirPin = 2;
const int trigPin = 3;
const int echoPin = 4;
const int ledTemp = 5;
const int ledMotion = 6;
const int ledDistance = 7;

void setup() {
  pinMode(tempPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledTemp, OUTPUT);
  pinMode(ledMotion, OUTPUT);
  pinMode(ledDistance, OUTPUT);

  Serial.begin(9600);
  lcd.begin();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Smart Home System");
}

void loop() {
  // Temperature Monitoring
  int tempReading = analogRead(tempPin);
  float voltage = tempReading * 5.0;
  voltage /= 1024.0;
  float temperatureC = (voltage - 0.5) * 100;
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.println(" C");

  if (temperatureC > 30) {
    digitalWrite(ledTemp, HIGH);
  } else {
    digitalWrite(ledTemp, LOW);
  }

  // PIR Motion Detection
  int motionDetected = digitalRead(pirPin);
  if (motionDetected == HIGH) {
    digitalWrite(ledMotion, HIGH);
    Serial.println("Motion Detected!");
    delay(5000); // LED stays on for 5 seconds
    digitalWrite(ledMotion, LOW);
    delay(1200); // Inhibit time
  }

  // Distance Measurement with Ultrasonic Sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  float distanceCm = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distanceCm);
  Serial.println(" cm");

  if (distanceCm < 10) {
    digitalWrite(ledDistance, HIGH);
  } else {
    digitalWrite(ledDistance, LOW);
  }

  // Display on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperatureC);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Dist: ");
  lcd.print(distanceCm);
  lcd.print(" cm");

  delay(1000);
}