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

#define DHTPIN 2      // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22 (AM2302)

const int trigPin = 4;  // Trigger pin of the HC-SR04
const int echoPin = 3; // Echo pin of the HC-SR04

long duration;  // Variable to store the duration of sound wave travel
int distance;   // Variable to store the calculated distance

DHT dht(DHTPIN, DHTTYPE);

// Initialize the LCD interface pins
LiquidCrystal lcd(12,11,10,9,8,7);

void setup() {
  Serial.begin(9600);
  Serial.println("DHT22 Sensor Test");
  dht.begin();
  
  // Set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
}

void loop() {
delay(2000);
  float temperature = dht.readTemperature();  // Read temperature as Celsius
  float humidity = dht.readHumidity();        // Read humidity

  // Check if any reads failed and exit early (to try again)
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the duration of the echo pulse
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;
  // Print temperature and humidity on Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

// Display temperature and humidity on LCD
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.print(temperature);
lcd.print(" C");
lcd.setCursor(0, 1);
lcd.print("Distance: ");
lcd.print(distance);
lcd.print(" cm");
}