//define variables
#define trigerPin 12
#define echoPin 13
#define ledPin 2
double duration, distance;
#include <DHT.h>;

//Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino

//Variables
float hum;  //Stores humidity value
float temp; //Stores temperature value

void setup() 
{
  //setup for Sensor
  Serial.begin(9600);
  dht.begin();
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);

  //setup for LED
  pinMode(ledPin, OUTPUT);
}

void loop() {
  //looping sensor (Create sound wave)
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigerPin, LOW);
  delayMicroseconds(2);

  //get duration
  duration = pulseIn(echoPin,HIGH);

   delay(1000);
    //Read data and store it to variables hum and temp
    hum = dht.readHumidity();
    temp= dht.readTemperature();
    //Print temp and humidity values to serial monitor
    Serial.print("Humidity: ");
    Serial.print(hum);
    Serial.print(" %, Temp: ");
    Serial.print(temp);
    Serial.println(" Celsius");
    

  //calculate distance
  distance = (duration/2) * 0.0343;
  //consider maximum width of the door = 300 cm and temp should be below 35
  if(distance<300 && temp > 35)
  {
    digitalWrite(ledPin, HIGH);    
    Serial.println("In Range and AC/fan is ON");
  }
  else if(distance<300 && temp < 35)
  {
    digitalWrite(ledPin, LOW);    
    Serial.println("In Range and AC/fan is OFF");
  }
  else{
    digitalWrite(ledPin, LOW);
    Serial.println("Not in Range");
  }
  
}