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


#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);


#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_LINES 2


#define BUZZERPIN  4
int buzzer = 4;
float temp;
float humi;


LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


void setup()
{
  Serial.begin(115200);
  Serial.println("HELLO ,CPE122!!");
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  Serial.println("HELLO ,CPE122!!");
  pinMode(buzzer, OUTPUT);
}


void loop()
{
  float temp = dht.readTemperature();
  float humi = dht.readHumidity();


  if (temp >= 35)
  {


    lcd.setCursor(0, 0);
    lcd.print("Temp=" +String(temp)+ " C ");
    lcd.setCursor(0, 1);
    lcd.print("humi=" +String(humi)+ " C ");


    buzzer_on();
  }
  else {


    lcd.setCursor(0, 0);
    lcd.print("Temp=" +String(temp));
    lcd.setCursor(0, 1);
    lcd.print("humi=" +String(humi));


  }


  delay(1);
}


void buzzer_on()


{ unsigned char i, j;


  { for (i = 0; i < 80; i++)


    { digitalWrite(buzzer, HIGH);


      delay(1);


      digitalWrite(buzzer, LOW);


      delay(1);


    }


    for (i = 0; i < 100; i++)


    {


      digitalWrite(buzzer, HIGH);


      digitalWrite(buzzer, LOW);


      delay(2);


    }


  }


}