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

#define DHTPIN 8
#define DHTTYPE DHT22
#define BUZZER_PIN 7

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{
    Serial.begin(9600);
    Serial.println("Temperature Monitoring System");
    lcd.begin(16, 2);
    lcd.backlight();
    dht.begin();
    
    pinMode(BUZZER_PIN, OUTPUT);
    digitalWrite(BUZZER_PIN, LOW);
}

void loop() {
    float t = dht.readTemperature();
    float h = dht.readHumidity();
    delay(1000);
    
    //Displays on LCD
    lcd.setCursor(0,0);
    lcd.print("Temp="); lcd.print(t); lcd.println("C");
    lcd.setCursor(0,1);
    lcd.print("Humidity="); lcd.print(h); lcd.println("%");
    
    //Control condition: If temperature > 30°C, turn on buzzer
    if (t > 30) {
        digitalWrite(BUZZER_PIN, HIGH);
        lcd.setCursor(14,0);
        lcd.print("!!");  // Visual alert
    } else {
        digitalWrite(BUZZER_PIN, LOW);
        lcd.setCursor(14,0);
        lcd.print("  ");  // Clear alert
    }
    
    //Display on serial monitor screen
    Serial.print("Temp= ");
    Serial.print(t); Serial.println(" C");
    Serial.print("Humidity= ");
    Serial.print(h); Serial.println(" %");
    
    if (t > 30) {
        Serial.println("ALERT: High Temperature!");
    }
}