#include <LiquidCrystal.h>
#include <DHT.h>

// LCD pins: RS, E, D4, D5, D6, D7
LiquidCrystal lcd(9, 10, 11, 12, 13, A0);

// DHT sensor setup
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

// Ultrasonic sensor setup
#define TRIG_PIN 3
#define ECHO_PIN 4

// LEDs and buzzer
#define GREEN_LED 5
#define YELLOW_LED 6
#define RED_LED 7
#define BUZZER_PIN 8

void setup() {
  // Initialize sensors and LCD
  dht.begin();
  lcd.begin(16, 2);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  lcd.print("Interactive Display");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read DHT sensor data
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Read distance from ultrasonic sensor
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Convert to cm

  // Display data on LCD
  lcd.setCursor(0, 0);
  lcd.print("T: " + String(temp) + "C H: " + String(humidity) + "%");
  lcd.setCursor(0, 1);
  lcd.print("Dist: " + String(distance) + "cm");

  // LED and buzzer logic
  if (temp > 35 || temp < 15 || distance < 10 || distance > 100) {
    // Critical condition: turn on red LED and buzzer
    digitalWrite(RED_LED, HIGH);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(BUZZER_PIN, HIGH);
  } else if (temp >= 25 && temp <= 35) {
    // Normal condition: turn on green LED
    digitalWrite(RED_LED, LOW);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(BUZZER_PIN, LOW);
  } else {
    // Moderate condition: turn on yellow LED
    digitalWrite(RED_LED, LOW);
    digitalWrite(YELLOW_LED, HIGH);
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(1000); // Delay for readability
}