// YWROBOT
// Compatible with the Arduino IDE 1.0
// Library version:1.1
#include <LiquidCrystal_I2C.h>
#define PIN_TRIG 3
#define PIN_ECHO 2

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

float cm;
float mm;
float inches;

void setup()
{
	Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  lcd.init();	// initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.print("  --> Distance <--  ");
	delay(3000);
	lcd.clear();
}

void loop()
{
	// Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

// Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH);
  cm = (duration / 58.475);
	mm = (duration / 58.475 * 10);
	inches = (duration / 148.475);
  /*
	Serial.print("Inches ");
	Serial.print(inches, 2);
	Serial.print("\t");
  Serial.print("cm ");
	Serial.println(cm, 2);
	*/
	lcd.setCursor(0,0);
	lcd.print("mm");
	lcd.setCursor(8,0);
	lcd.print("cm");
	lcd.setCursor(15,0);
	lcd.print("inch");
	lcd.setCursor(0,1);
	lcd.print(mm, 1);
	lcd.setCursor(8,1);
	lcd.print(cm, 1);
	lcd.setCursor(15,1);
	lcd.print(inches, 1);
	delay(2000);
	lcd.clear();
}