#include "DHT.h"

#define DHTPIN 4
#define DHTTYPE DHT22 
DHT dht(DHTPIN, DHTTYPE);

int ledPin = 13;
int pirPin = 2;  
int pirState = LOW;
int val = LOW;

#define TRIG_PIN 8
#define ECHO_PIN 7

void setup() {
  Serial.begin(115200);
  Serial.println(F("DHT22, PIR Motion Sensor, and Ultrasonic Sensor Example!"));

  dht.begin();

  pinMode(ledPin, OUTPUT);
  pinMode(pirPin, INPUT);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  val = digitalRead(pirPin);
  if (val == HIGH) { 
    Serial.println("Motion detected!");
    digitalWrite(ledPin, HIGH);

    if (pirState == HIGH) {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW);

    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
  }
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
  } else {
    Serial.print(F("Humidity: "));
    Serial.print(humidity);
    Serial.print(F("% Temperature: "));
    Serial.print(temperature);
    Serial.println(F("°C"));
  }



  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;

  Serial.print(F("Distance: "));
  Serial.print(distance);
  Serial.println(F(" cm"));

  delay(2000);
}