#define trigPin 13

#define echoPin 12

#define motor 7

#define buzzer 6

void setup()

{

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(motor, OUTPUT);

pinMode(buzzer,OUTPUT);

}

void loop()

{

long duration, distance;

digitalWrite(trigPin, LOW);

delayMicroseconds(15);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (100/2);

if (distance < 100)   // This is where checking the distance you can change the value

{

digitalWrite(motor,HIGH);  // When the the distance below 100cm

digitalWrite(buzzer,HIGH);

} else

{

digitalWrite(motor,LOW);   // when greater than 100cm

digitalWrite(buzzer,LOW);

} delay(500);

}