// Example testing sketch for various DHT humidity/temperature sensors
// Tech at Home
//Automatic Room temperature monitoring system -Temperature base Fan speed control Engineering project
#include "DHT.h"

#define DHTPIN 2     // what pin we're connected to

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)


DHT dht(DHTPIN, DHTTYPE);

int in1=3;
int in2=4;
int en1=5;

void setup() {
  Serial.begin(9600);
  Serial.println("DHTxx test!");

  dht.begin();

pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);

}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);

   // Read temperature as Celsius (the default)
  float t = dht.readTemperature();//citim doar temperatura Celsius
  
  // Check if any reads failed and exit early (to try again).

  if (isnan(t)){
 // if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  
 
  Serial.print ("\n");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
 
 
//Change temperature ranges based on your requirement

  if(t <= 20)//original if(t <= 28)
  {
    digitalWrite(in1, LOW);
    digitalWrite(in2, LOW);
    analogWrite(en1, 0);
    
  }
  else if((t > 20) && (t <= 30))//original else if((t > 28) && (t <= 30))
  {
    digitalWrite(in1, HIGH);
    digitalWrite(in2, LOW);
    analogWrite(en1, 20);//original analogWrite(en1, 100);
  }
 else if(t > 30)//original else if(t > 30)
  {
     digitalWrite(in1, HIGH);
    digitalWrite(in2, LOW);
    analogWrite(en1, 255);
  }
}