int trig=7;
int echo=8;
int buzzer=9;
int TimeMicro=0;
int distance;
int x;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  pinMode(buzzer,9);
  

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trig,LOW);
  delay(2);
  digitalWrite(trig,HIGH);
  delay(10);
  digitalWrite(trig,LOW);
   TimeMicro = pulseIn(echo,HIGH);
   distance=TimeMicro* 0.034 /2;
 Serial.println(distance);
   delay(2000);
   x=distance;
   if(x>30){
    digitalWrite(buzzer, HIGH);
   }
   else{
    digitalWrite(buzzer, LOW);
   }
   

}