Social Distance Detector

1const int trigPin = 9; //pin for sensor, trig pin transmits signal to  object in front of it
2const int echoPin = 10; //pin for sensor, echo pin receives  the signal the object reflects and therefore the distance is measured
3const int  ledPin = 13; //led pin on arduino
4const int buzzPin = 2; //buzzer pin on arduino
5long  duration; //distance variable
6int distance;
7void setup()
8{
9Serial.begin(9600);  
10pinMode(trigPin, OUTPUT); 
11pinMode(echoPin, INPUT);
12pinMode(ledPin, OUTPUT);  
13pinMode(buzzPin, OUTPUT);
14}
15void loop() {
16digitalWrite(trigPin, LOW);
17delayMicroseconds(2);
18digitalWrite(trigPin,  HIGH); //trigpin's output pulse
19delayMicroseconds(1000);
20digitalWrite(trigPin,  LOW);
21duration = pulseIn(echoPin, HIGH); //calibrate echo pin's pulse input
22distance=  duration*0.034/2; // distanceCm is half the duration multiplied by 0.034
23Serial.println("Distance:  "); //print to serial monitor
24Serial.println(distance); //print distance in  Cm to the serial monitor
25delay(500); //so you don't get overloaded by serial  monitor outputs
26
27
28if (distance <= 150 && distance >= 0) { //if distance  from sensor to object is less than 150cm and more than 0
29
30digitalWrite(ledPin,  HIGH); //light led
31digitalWrite(buzzPin, HIGH); //buzz
32tone(2, 500, 120);  //so we can hear a sound from the buzzer that isn't inaudible
33//buzz and light  LED
34} else {
35//dont buzz or light LED
36digitalWrite(ledPin, LOW); //don't  light led
37digitalWrite(buzzPin, LOW); //don't buzz
38}
39}