#include<LiquidCrystal.h>
LiquidCrystal lcd(2,3,4,5,6,7);//create as lcd object.parameter:(I3,enable,d4,d6,d7)

const int trig  =10;
const int echo  =11;
long duration;
int distanceCm,distanceInch;
void setup()
{
  lcd.begin(16,2);//initialize the interface to the LCD screen , and specification the dimension(width and height) of the display
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}
void loop()
{
digitalWrite(trig, HIGH);
delayMicroseconds(2);
digitalWrite(trig, LOW);
delayMicroseconds(10);
digitalWrite(trig, LOW);

duration = pulseIn(echo,HIGH);
distanceCm = duration*0.034/2;
distanceInch = duration*0.0133/2;
lcd.setCursor(0,0);
lcd.print("distance:");
lcd.print(distanceCm);
lcd.print("cm");
delay(10);
lcd.setCursor(0,1);
lcd.print("distance:");
lcd.print("distanceInch");
lcd.print("inch");
delay(10);
}