#include <Wire.h>
 
#include <LiquidCrystal_I2C.h>

#include "DHT.h"


#define DHTPIN 2
#define DHTTYPE DHT22
int on;
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
  Serial.begin(9600);
  Serial.println("DHT22 test!");
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(9, INPUT);
  lcd.begin(0x27, 16, 2);
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(4,0);
  dht.begin();
}

void loop() {

  if(digitalRead(9)==HIGH){
    on=1;
  }
  if(on==1){


  delay(2500);
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if ( isnan(t)) {
    lcd.clear();
    lcd.print("Eroare Senzor");
    return;
  }
  lcd.clear();
  lcd.print("Temperatura: ");
  lcd.setCursor(4,1);
  lcd.print(t);
  lcd.println(" *C ");


  if (t<25 && t>20)
  {
     digitalWrite(4, HIGH);

  }
  else
  {
     digitalWrite(4, LOW);
  }

  if(t<20)
  {
    digitalWrite(3, HIGH);
  }
  else
  {
    digitalWrite(3, LOW);
  }
  if(t>25)
  {
    digitalWrite(5, HIGH);
    tone(7, 1000);
  }
  else
  {
    digitalWrite(5, LOW);
    noTone(7);
  }
  
}


}