#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 
                                  // for a 16 chars and 2 line display
int time = 0;
int distance = 0;
int echo =11;  //pin number 11;  capture returned signal
int trigger = 12;  //pin number 12; send signal


void setup()
{
  pinMode(echo, INPUT);
  pinMode(trigger, OUTPUT);
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();  //background light ON
  Serial.begin(9600); //starts send and receive signal
  lcd.begin(16, 2);//begin LCD for a 16 chars and 2 line display
  lcd.setCursor(0,0);  //set cursor initially
  lcd.print("Hello, Peter");
  delay(2000);
}

void loop()
{
  lcd.clear(); // initialize the lcd;  clear the LCD screen 
  digitalWrite(trigger , LOW);//reset
  digitalWrite(trigger , HIGH);//set
  //pulseIn() to get the time taken by sound wave to reflect back after hitting the object
  time = pulseIn(echo,HIGH);
  distance = 0.0172*time;//formulae to covert the signal to distance measured
  lcd.setCursor(5,0);  //5 is column pixel value
  lcd.print(distance);
  lcd.print("cm");
  delay(1000);
}
//OUTPUT- Click on sensor and change distance value to see output on LCD screen