//http://colandino.nl
#include "Wire.h"
#include "LiquidCrystal_I2C.h"
#include "NewPing.h"

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#define ECHO_PIN 11 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define TRIGGER_PIN 12 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define MAX_DISTANCE 500 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup()
{
   lcd.init();                      // initialize the lcd 
 lcd.begin (20,4); //  our LCD is a 20x4, change for your LCD if needed

// LCD Backlight ON
// lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.backlight();

lcd.home (); // go home on LCD
lcd.print("Range Finder HC-SR04"); 
}

void loop()
{
 unsigned int uS = sonar.ping(); // Send ping, get ping time in microseconds (uS).
 unsigned int cm = sonar.convert_cm(uS); // Convert into centimeters

 lcd.setCursor (0,1); // go to start of 1st line
 lcd.print("http://colandino.nl");
 lcd.setCursor (0,2); // go to start of 2nd line
 lcd.print("Huidige afstand:");
 lcd.setCursor (0,3); // go to start of 4th line
 lcd.print("Ping: ");
 lcd.print(cm);
 lcd.print(" cm ");

 delay(250);
}