#include "DHT.h";
#include <Servo.h>
Servo myservo; 
#define DHTPIN 13    
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE); 
float t,h;
int pos = 0,trig=8,echo=7, fan=12,dist,light=6;
long time;

void servo(){
   for (pos = 0; pos <= 180; pos += 1) { 
    myservo.write(pos); 
    delay(15);                       
  }
  for (pos = 180; pos >= 0; pos -= 1) {
    myservo.write(pos);             
    delay(15);                       
  }
}
int distance(){
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  time=pulseIn(echo,HIGH);
  dist=time/58;
  return dist;
}    
float temp(){
  dht.begin();
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  return t;

}
void setup() {
pinMode(light, OUTPUT);
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
pinMode(fan,OUTPUT);
myservo.attach(9); 
}

void loop() {
  // servo();
  dist=distance();
  if(dist<100){
   digitalWrite(light, HIGH);
   delay(200);
   t=temp();
   if(t>22 && h>40){
    digitalWrite(fan, HIGH);
   }
   else if(t>22 && h<40){
    digitalWrite(fan, HIGH);
   }
   else if(t<22 && h>40){
    digitalWrite(fan, LOW);
   }
   else if(t<22 && h<40){
    digitalWrite(fan, LOW);
   }
  }else {
   digitalWrite(light,LOW);
   digitalWrite(fan ,LOW);
  }
  }