Ultrasonic Measuring Tape

/*
This code should output the distance from the
ultrasonic sensor to the nearsest object

press crtl + shift + m to open the serial moniter

https://bit.ly/2KxSD1h
https://bit.ly/29aWeQi
*/

// Define the pins for the ultrasonic sensor
int const trigPin = 5;
int const echoPin = 4;
int pos = 0;    // variable to store the servo position

void setup() {
  pinMode(trigPin, OUTPUT); // trig pin will have pulses output
  pinMode(echoPin, INPUT); // echo pin should be input to get pulse width
  Serial.begin(9600);
}

void loop() {
  // Duration will be the input pulse width and distance will be the distance to the obstacle in centimeters
  int duration, distance;
  
  // Output pulse with 1ms width on trigPin
  digitalWrite(trigPin, HIGH);
  delay(1);
  digitalWrite(trigPin, LOW);
  
  // Measure the pulse input in echo pin
  duration = pulseIn(echoPin, HIGH);
  
  // Distance is half the duration devided by 29.1 (from datasheet)
  distance = (duration/2) / 29.1;

  // Print the distance (CM) into the serial moniter
  Serial.print(distance);
  Serial.println(" CM");
  
  // Waiting 60 ms won't hurt any one
  delay(60);
}