#include <LiquidCrystal.h> //Load Liquid Crystal Library
LiquidCrystal LCD(11,10,9,2,3,4,5);  //Create Liquid Crystal Object called LCD

#define trigPin 13 //Sensor Echo pin connected to Arduino pin 13
#define echoPin 12 //Sensor Trip pin connected to Arduino pin 12

//Simple program just for testing the HC-SR04 Ultrasonic Sensor with LCD dispaly 
//URL:

void setup() 
{  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  LCD.begin(16,2); //Tell Arduino to start your 16 column 2 row LCD
  LCD.setCursor(0,0);  //Set LCD cursor to upper left corner, column 0, row 0
  LCD.print("Target Distance:");  //Print Message on First Row
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;

  LCD.setCursor(0,1);  //Set cursor to first column of second row
  LCD.print("                "); //Print blanks to clear the row
  LCD.setCursor(0,1);   //Set Cursor again to first column of second row
  LCD.print(distance); //Print measured distance
  LCD.print(" cm");  //Print your units.
  delay(250); //pause to let things settle
}