How To Use An Ultrasonic Sensor With An Arduino

#include <Ultrasonic.h>

/*
 * Pass as a parameter the trigger and echo pin, respectively,
 * or only the signal pin (for sensors 3 pins), like:
  Ultrasonic ultrasonic(13); */
 ////////////////////////you may need to switch the two numbers below////////////////////////
Ultrasonic ultrasonic(8, 7);

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.print("Distance in CM: ");
  // Pass INC as a parameter to get the distance in inches
  Serial.println(ultrasonic.distanceRead());
  delay(1000);
}