Ultrasonic Measuring Tape

1/*
2This code should output the distance from the
3ultrasonic sensor  to the nearsest object
4
5press crtl + shift + m to open the serial moniter
6
7https://bit.ly/2KxSD1h
8https://bit.ly/29aWeQi
9*/
10
11//  Define the pins for the ultrasonic sensor
12int const trigPin = 5;
13int const  echoPin = 4;
14int pos = 0;    // variable to store the servo position
15
16void  setup() {
17  pinMode(trigPin, OUTPUT); // trig pin will have pulses output
18  pinMode(echoPin, INPUT); // echo pin should be input to get pulse width
19  Serial.begin(9600);
20}
21
22void  loop() {
23  // Duration will be the input pulse width and distance will be the  distance to the obstacle in centimeters
24  int duration, distance;
25  
26  //  Output pulse with 1ms width on trigPin
27  digitalWrite(trigPin, HIGH);
28  delay(1);
29  digitalWrite(trigPin, LOW);
30  
31  // Measure the pulse input in echo pin
32  duration = pulseIn(echoPin, HIGH);
33  
34  // Distance is half the duration  devided by 29.1 (from datasheet)
35  distance = (duration/2) / 29.1;
36
37  //  Print the distance (CM) into the serial moniter
38  Serial.print(distance);
39  Serial.println(" CM");
40  
41  // Waiting 60 ms won't hurt any one
42  delay(60);
43}