#define BLYNK_TEMPLATE_ID "TMPL3a1SHSwgQ" 
#define BLYNK_TEMPLATE_NAME "fire wall system" 
#define BLYNK_AUTH_TOKEN "Z1_rGBnPC5km44wEGPKmkKaggEOa51eV"
#include <Wire.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include "ThingSpeak.h"
#include "pitches.h"
#define DHTTYPE DHT22
#define DHTPIN 16
#define BUZZER_PIN 17 
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(DHTPIN, DHTTYPE);
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST"; 
char pass[] = "";

void setup() {
  Serial.begin(115200);
  pinMode(17, OUTPUT);
  digitalWrite(17,LOW);
  lcd.init();
  lcd.backlight();
  lcd.print("Temp:");
  Serial.println("Hello, ESP32!");
  dht.begin(); 
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  delay(2000);
  float humidity = dht.readHumidity();
  float temp = dht.readTemperature(); 
  if (isnan(humidity) || isnan(temp)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  Serial.print("Humidity: "); 
  Serial.print(humidity);
  Serial.print("%  Temp: ");
  Serial.print(temp);
  Serial.println(" C");
  Blynk.virtualWrite(V0, temp);
  Blynk.virtualWrite(V1, humidity);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");
  if (temp > 65) {
    digitalWrite(BUZZER_PIN, HIGH); 
    lcd.clear(); 
    lcd.setCursor(0, 0); 
    lcd.print("Temp: ");
    lcd.print(temp);
    lcd.print(" C");
    lcd.setCursor(0, 1); 
    lcd.print("Alert: Overheat!"); 
    delay(5000); 
    digitalWrite(BUZZER_PIN, LOW); 
  } else {
    digitalWrite(BUZZER_PIN, LOW); 
  }
  Blynk.run();
}