Smart Glasses V1

1// Define pins for ultrasonic and buzzer
2int const trigPin = 10;
3int  const echoPin = 9;
4int const buzzPin = 2;
5void setup()
6{
7pinMode(trigPin,  OUTPUT); // trig pin will have pulses output
8pinMode(echoPin, INPUT); // echo  pin should be input to get pulse width
9pinMode(buzzPin, OUTPUT); // buzz pin  is output to control buzzering
10}
11void loop()
12{
13// Duration will be the  input pulse width and distance will be the distance to the obstacle in centimeters
14int  duration, distance;
15// Output pulse with 1ms width on trigPin
16digitalWrite(trigPin,  HIGH);
17delay(1);
18digitalWrite(trigPin, LOW);
19// Measure the pulse input  in echo pin
20duration = pulseIn(echoPin, HIGH);
21// Distance is half the duration  devided by 29.1 (from datasheet)
22distance = (duration/2) / 29.1;
23// if distance  less than 0.5 meter and more than 0 (0 or less means over range)
24if (distance  <= 50 && distance >= 0) {
25// Buzz
26digitalWrite(buzzPin, HIGH);
27} else {
28//  Don't buzz
29digitalWrite(buzzPin, LOW);
30}
31// Waiting 60 ms won't hurt any  one
32delay(60);
33}  
34