int const trigPin = 11;
int const echoPin = 9;
int const buzzPin = 10;
void setup()
{
pinMode(trigPin, OUTPUT); 
pinMode(echoPin, INPUT); 
pinMode(buzzPin, OUTPUT); 
}

void loop()
{

int duration, distance;

digitalWrite(trigPin, HIGH);
delay(1);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (duration/2) / 29.1;

if (distance <= 100 && distance >=60 ) {

digitalWrite(buzzPin, HIGH);
delay(100);
digitalWrite(buzzPin, LOW);
delay(50);

} 

if(distance <=59 && distance >=30){

  digitalWrite(buzzPin, HIGH); 
delay(50);
digitalWrite(buzzPin, LOW);
delay(5);
}
 



}