#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <Ultrasonic.h>
// Initialize the LCD display
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (adjust if needed)

// Initialize the DHT sensor
#define DHTPIN 7
#define DHTTYPE DHT22 // Change to DHT22 if using DHT22
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  lcd.init();
  lcd.backlight();
  dht.begin();
}

void loop() {
  // Read ultrasonic distance
  float distance_cm = readUltrasonicDistance();

  // Read temperature from DHT sensor
  float temperature_C = dht.readTemperature();

  // Display results on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(distance_cm);
  lcd.print(" cm");

  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature_C);
  lcd.print(" C");

  delay(10); // Update every second
}

float readUltrasonicDistance() {
  // Generate 10-microsecond pulse to TRIG pin
  digitalWrite(9, HIGH);
  delayMicroseconds(10);
  digitalWrite(9, LOW);

  // Measure duration of pulse from ECHO pin
  long duration_us = pulseIn(8, HIGH);

  // Calculate distance in centimeters
  return 0.017 * duration_us;
}