How to run the ultrasonic sensor while the button Blynk V2 is pressed?

[Jien_Yang]

BLYNK_WRITE(V1)
{
  int x = param[0].asInt();
  int y = param[1].asInt();

  // Do something with x and y
  /*  Serial.print("X = ");
    Serial.print(x);
    Serial.print("; Y = ");
    Serial.println(y);*/
  if (y > 220)
    forward();
  else if (y < 35)
    backward();
  else if (x > 220)
    right();
  else if (x < 35)
    left();
  else
    Stop();
}

  int z;
   BLYNK_WRITE(V2)
{
   int z=param.asInt();
  if ( z==1 )
  {
    digitalWrite(m11, HIGH);
    digitalWrite(m12, LOW);
    digitalWrite(m21, HIGH);
    digitalWrite(m22, LOW);    
    delay(2000); //CHANGE THIS ACCORDING TO HOW THE ROBOT TURNS.
  }
   else
   {
    digitalWrite(m11, LOW);
    digitalWrite(m12, LOW);
    digitalWrite(m21, LOW);
    digitalWrite(m22, LOW);
   }
  }

void loop()
{
  Blynk.run();
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;

  if (z)
  {
    if (distance<20)
    {
    digitalWrite(m11, HIGH);
    digitalWrite(m12, LOW);
    digitalWrite(m21, LOW);
    digitalWrite(m22, LOW);
    delay(1000);
    digitalWrite(m11, HIGH);
    digitalWrite(m12, LOW);
    digitalWrite(m21, HIGH);
    digitalWrite(m22, LOW);   
   }
   else
   {
    z;
   }
  }
}

[GunnerTechTools]

Hello… in answer to your titled question… First you read the prerequisite Welcome Topic…

[README] Welcome to Blynk Community!

Hey, welcome to Blynk Community. This is the best place to ask questions, leave feedback and share your ideas. If this is the first time you hear about Blynk, check out our website www.blynk.cc and come back! As the community is big (and growing), let’s agree on some basic rules. Asking for help Before creating a new topic and asking for help, please check if your question was already answered: Use forum search function You may want to check out: Blynk Documentation Blynk Wiki Blynk Exa…

Then go back and edit your first post to properly format your posted code…

Next, read the Help Files for proper ways to code with Blynk (hint, your current void loop() is bad for Blynk)…

Keep your void loop() clean

How to control anything with Blynk app.

How to display ANY sensor data in Blynk app

Then search this forum for keywords like ultrasonic… (hint I have a topic full of examples, including one for ultrasonic)…

https://community.blynk.cc/search?q=ultrasonic%20sensor

And finally, read those articles, try out the examples and have fun learning

[Blynk_Coeur]

Problem with ultrasonic

better use basic function instead of Newping I already used Newping to test it, but I prefere to use that digitalWrite(TRIGGER, LOW); delayMicroseconds(2); digitalWrite(TRIGGER, HIGH); delayMicroseconds(10); digitalWrite(TRIGGER, LOW); duration = pulseIn(ECHO, HIGH); distance = ((duration / 2) / 29.1) * 10;

[GunnerTechTools]

Well, I saw the OP was back in the forum since my post, but did nothing about fixing his post or clicking on any links.

So I formatted the post for him… was either that or delete the topic as warned in the instructions… maybe next time

[Blynk_Coeur]

he is going to sleep until summer.