/* How to use the DHT-22 sensor with Arduino uno.
   Is a temperature and humidity sensor! 
   See it in original form: 
   https://create.arduino.cc/projecthub/mafzal/temperature-monitoring-with-dht22-arduino-15b013
*/
#include <stdio.h>
//LCD I2C library:
#include <LiquidCrystal_I2C.h>
//DHT22 sensor library:
#include <DHT.h>;

//LCD I2C address 0x27, 20 column and 4 rows!
LiquidCrystal_I2C lcd(0x27, 16, 2);

//Constants:
#define DHTPIN 2          //what pin we're connected to
#define DHTTYPE DHT22     //DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //Initialize DHT sensor for normal 16mhz Arduino

//Variables:
int chk;
float H; //Humidity value
float T; //Temperature value
int buzzer = 12;

void setup(){
  //Initialize LCD, DHT22 sensor and buzzer:
  lcd.init(); lcd.backlight();
  //Serial Communication is starting with 9600 of baudrate speed
  Serial.begin(115200);
  dht.begin();
  pinMode(13, OUTPUT); pinMode(buzzer, OUTPUT);
  //Print some text in Serial Monitor
  Serial.println("DHT22 sensor with Arduino Uno R3!");
  pinMode(9, OUTPUT); pinMode(10, OUTPUT); pinMode(11, OUTPUT);
}

void loop(){
  delay(2000);
  //Read data and store it to variables hum and temp
  H = dht.readHumidity();
  T = dht.readTemperature();
  
  //Print temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(H);
  Serial.println(" %; ");
  Serial.print("Temperature: ");
  Serial.print(T);
  Serial.println(" Celsius.\n");
  

  if(T >= 26.00 && T < 30 ){
   digitalWrite(9, HIGH);
   digitalWrite(10, LOW);
   digitalWrite(11, LOW);
   
   lcd.println("   warm!    ");
   lcd.setCursor(0, 1);
   lcd.println(T );
   lcd.setCursor(0, 0);
   lcd.println(H);
   digitalWrite(buzzer, 1); tone(buzzer, 900, 100);
   delay(400);
   digitalWrite(buzzer, 0); tone(buzzer, 900, 100);
   delay(400);
   digitalWrite(buzzer, 1); tone(buzzer, 900, 100);
   delay(400);
   digitalWrite(buzzer, 0); tone(buzzer, 900, 100);
   delay(400);
  }
   if(T <26 && T >10 )
   {
  
   digitalWrite(9, LOW);
   digitalWrite(10, LOW);
   digitalWrite(11, HIGH);
   
   lcd.println(" normal ");
   lcd.setCursor(0, 1);
   lcd.println(T);
   lcd.setCursor(0, 0);
   lcd.println(H);
   
   digitalWrite(buzzer, 0);
  }
  
  
  
 
  if( T >= 35.00){
   digitalWrite(9, LOW);
   digitalWrite(10, HIGH);
   digitalWrite(11, LOW);
   
   lcd.println("high");
   lcd.setCursor(0, 1);
   lcd.println(T);
   lcd.setCursor(0, 0);
   lcd.println(H);
   digitalWrite(buzzer, 1); tone(buzzer, 400, 400);
   delay(400);
   digitalWrite(buzzer, 0); tone(buzzer, 400, 400);
   delay(400);
  }
  if(T <= 10){
   digitalWrite(9, LOW);
   digitalWrite(10, HIGH);
   digitalWrite(11, LOW);
   
   lcd.println("cool ");
   lcd.setCursor(0, 1);
   lcd.println(T);
   lcd.setCursor(0, 0);
   lcd.println(H);
   digitalWrite(buzzer, 1); tone(buzzer, 400, 400);
   delay(400);
   digitalWrite(buzzer, 0); tone(buzzer, 400, 400);
   delay(400);
  }
}