int echo = 7;
int trig = 6;
int buzzer =3;
int distance;
int duration;
void setup() {

pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
pinMode(buzzer, OUTPUT);
Serial.begin(9600);
}
void loop() {
digitalWrite(trig,0);
delay(2);
digitalWrite(trig,1);
delayMicroseconds(10);
digitalWrite(trig,0);
duration = pulseIn(echo,1);
distance = duration*0.034/2;
Serial.print("Distance in Cm:");
Serial.println(distance);
if ( distance<=100 ) {
tone(buzzer,1000);
Serial.println("OBJECT IS DETECTED");
delay(3000);

}
else{
noTone(buzzer);
Serial.println("OBJECT IS NOT DETECTED");
delay(50);
}
}