// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain

// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor

#include "DHT.h"

#define DHTPIN 2 //Digitla pIns connected to DHT Sensor
#define DHTTYPE DHT11 //using  DHT11
DHT dht(DHTPIN, DHTTYPE);//interface with a DHT sensor

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

  dht.begin();
}

void loop(){
  
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();//function communicates with the DHT11 sensor through the pin
  //Reads temp. in celcius(default)
  float t = dht.readTemperature();
  //reads tempeerature as fahrenheit
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  //standard function that checks if the value passed 
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  //The given code snippets demonstrate how to compute the
  // heat index using the DHT library for a DHT sensor. 
  //The heat index is a measure that combines air temperature
  // and relative humidity to determine the perceived temperature 
  //(how hot it feels).

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h); //compute the heat index 
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: ")); //storing the string in Flash Memory
  Serial.print(h);
  Serial.print(F("% Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F Heat Index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
  //println() method ensures cursor moves to next line after printing

   // Wait a few seconds between measurements.
  delay(2000);
}