#define BLYNK_TEMPLATE_ID "TMPL3ZbBUgbYh"
#define BLYNK_TEMPLATE_NAME "Gas Leakage1"
#define BLYNK_AUTH_TOKEN "LfoucvbvmUhUVBrGQAi-nHSonLAXtH4f"
#include <WiFi.h>
 
#include<BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>
#define mq 34
#define buzzer 25
#define gled 26
#define rled 27
#define rb 33
const int th=2000;
LiquidCrystal_I2C lcd(0x27,16,2);
bool isMuted= false;
char auth[]=BLYNK_AUTH_TOKEN;
char ssid[]="Wokwi-GUEST";
char pass[]="";
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(mq, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(gled, OUTPUT);
  pinMode(rled, OUTPUT);
  pinMode(rb, INPUT_PULLUP);
  Blynk.begin(auth,ssid,pass);

  lcd.init();
  lcd.backlight();
  lcd.print("Gas Sensor");
  lcd.setCursor(0,1);
  lcd.print("Loading..");
  delay(2000);
  lcd.clear();
  digitalWrite(buzzer,LOW);
  digitalWrite(rled,LOW);
  digitalWrite(gled,HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:
  Blynk.run();

  int sv=analogRead(mq);
  if(sv>=th){

     
    if(!isMuted){
    digitalWrite(buzzer, HIGH); }
    digitalWrite(rled,HIGH);
    digitalWrite(gled,LOW);
    lcd.setCursor(0,0);
    lcd.print("!!! Danger !!!");
    lcd.setCursor(0,1);
    lcd.print("Gas Val:");
    lcd.print(sv);
    Blynk.logEvent("gas_alert","Warning: Gas Leakage Detected!");
     
  }
  else{
    isMuted=false;
    digitalWrite(buzzer,LOW);
    digitalWrite(rled,LOW);
    digitalWrite(gled,HIGH);
    lcd.setCursor(0,0);
    lcd.print("!!! Safe !!!");
    lcd.setCursor(0,1);
    lcd.print("Gas Val:");
    lcd.print(sv);
     
  }
  if(digitalRead(rb)==LOW && sv>=th){
    digitalWrite(buzzer,LOW);
    isMuted=true;
    lcd.setCursor(0,1);
    lcd.print("Gas Val:");
    lcd.print(sv);
    lcd.print("Muted");
    delay(1000);
    lcd.clear();

  }
  Serial.println(sv);
  delay(1000); // this speeds up the simulation
}