#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include <Adafruit_BMP085.h>

#define DHTPIN 2
#define DHTTYPE DHT22  
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);
float Trange_Min = 20, Trange_Max = 30;
float Hrange_Min = 40, Hrange_Max = 60;

Adafruit_BMP085 bmp; 

void setup() {
  dht.begin();
  bmp.begin(); 

  lcd.init(); 
  lcd.backlight();
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  float p = bmp.readPressure();
    
  lcd.setCursor(0, 0);
  lcd.print("TEMPERATURE:");
  lcd.print(t);
  lcd.setCursor(0, 1);
  lcd.print("HUMIDITY:");
  lcd.print(h);
  lcd.setCursor(0, 2);
  lcd.print("PRESSURE:");
  lcd.print(p);

  if (t < Trange_Min || t > Trange_Max || h < Hrange_Min || h > Hrange_Max) {
    tone(3, 700);
  } else {
    noTone(3);
  }
  
  if (t < Trange_Min || t > Trange_Max) {
    digitalWrite(4, HIGH);
  } else {
    digitalWrite(4, LOW);
  }

  if (h < Hrange_Min || h > Hrange_Max) {
    digitalWrite(5, HIGH);
  } else {
    digitalWrite(5, LOW);
  }
}