#include <LiquidCrystal_I2C.h>
 //Importing libraries
#include <NewPing.h>

LiquidCrystal_I2C lcd(0x3F,16,2); //Creating object

#define ECHO_PIN 13 //Defining pins
#define TRIG_PIN 12
#define MAX_DIST 400

int contrast = 100; //Defining contrast

NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DIST); //Defining newping object (The HC-SR04)

void setup() { //Setup
  lcd.begin(); //Change this to the size of your LCD, my happens to be 16x2
  lcd.clear(); //Clear screen
  pinMode(2, OUTPUT); //Setting contrast pin 2 to an output
  analogWrite(2, contrast); //Setting contrast
}

void loop() {
  unsigned int uS1 = sonar.ping_in(); //Ping in inches
  unsigned int uS2 = sonar.ping_cm(); // Ping in cm
  lcd.clear(); //Clearing screen
  lcd.setCursor(2,0); //Setting cursor
  lcd.print("Distance: "); //Printing text
  lcd.print(uS2);
  lcd.print("cm");
  lcd.setCursor(2,1);
  lcd.print("Distance: ");
  lcd.print(uS1);
  lcd.print("in");
  lcd.setCursor(1,0);
  delay(500); //Change this to the update time you want, I just used 500 ms
}