Next-Gen Remote Monitoring with Node MCU Technology

#include <WiFi.h>
#include <WiFiClient.h>
#define BLYNK_TEMPLATE_ID "TMPL3HcM9-Wa"
#define BLYNK_DEVICE_NAME "----------------"
#define BLYNK_AUTH_TOKEN "-----------------"
#include <BlynkSimpleEsp32.h>


#define  trig  5
#define  echo  18

#define MQ3 34 
#define BLUE 2 

long duration;
int distance;
int per;


char auth[] = "58qpgrH1IC4nbu794mqmRZYkWMhMG0sT";
char ssid[] = "max";  
char pass[] = "bishal12"; 

BlynkTimer timer;


int sensorValue = 0;
boolean state = false;
int temp=25;
int pres=1016;

void setup()
{
  // Debug console
  pinMode(trig, OUTPUT); 
  pinMode(echo, INPUT);   
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);

 timer.setInterval(1000L, sendSensor);
}

void loop()
{
  Blynk.run();
  timer.run();
}
void sendSensor()
{
  digitalWrite(trig, LOW);   
  delayMicroseconds(2);       
  digitalWrite(trig, HIGH); 
  delayMicroseconds(10);      
  digitalWrite(trig, LOW);   
  duration = pulseIn(echo, HIGH);   
  distance = duration * 0.034 / 2;  
  per=(100*distance/400);

  Serial.print("Distance = ");        
  Serial.println(distance);

  if(distance <= 5)
  {
    Blynk.tweet("My Arduino project is tweeting using @blynk_app and its awesome!\n #arduino #IoT #blynk");
    Blynk.notify("Post has been twitted");
  }
  Blynk.virtualWrite(V0, per);  //Pause for 3 seconds and start measuring distance again
  sensorValue = analogRead(MQ3); 
  Blynk.virtualWrite(V1, sensorValue); 

  Serial.println(sensorValue); 
  
  Blynk.virtualWrite(V2, pres);
  Blynk.virtualWrite(V3, temp);

  if (sensorValue > 500) 
  {
    Blynk.notify("Gas Detected!");
    digitalWrite(BLUE, HIGH);
  }

  else
  {
    digitalWrite(BLUE, LOW); 
  }
}