Amaurotic shoe accessory

int trigPin = 1 ;
int echoPin = 2 ;
long duration ;
int distanceCm ;
int buzzer = 4 ;
int vibrate = A0 ;

void setup() 
{
  // put your setup code here, to run once:
   pinMode(trigPin,OUTPUT);
   pinMode(echoPin,INPUT);
   pinMode(vibrate,OUTPUT);
}

void loop()
{
  // put your main code here, to run repeatedly:
   digitalWrite(trigPin,LOW);
   delayMicroseconds(2);
     digitalWrite(trigPin,HIGH);
   delayMicroseconds(10);
     digitalWrite(trigPin,LOW);

   duration = pulseIn(echoPin,HIGH);
   distanceCm = duration*0.034/2;
   
   if(distanceCm<=300 && distanceCm>=150)
   {
      tone(buzzer,450);
      delay(500);
      tone(buzzer,0);
       delay(500);
   }

   else if( distanceCm<=150)
   {
      tone(buzzer,450);
      delay(200);
      tone(buzzer,0);
       delay(200);

       digitalWrite(vibrate,HIGH);
       delay(500);
       digitalWrite(vibrate,LOW);
       delay(200);
       
   }
   else
   {
      tone(buzzer,0);
       digitalWrite(vibrate,LOW);
   }
   

       
   
}