Ultrasonic Sensor with LCD Display Using 433MHz

//load libraries
#include <VirtualWire.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>

//Define variables 

#define I2C_ADDR          0x3F       //Define I2C Address where the PCF8574A is
#define BACKLIGHT_PIN      3
#define En_pin             2
#define Rw_pin             1
#define Rs_pin             0
#define D4_pin             4
#define D5_pin             5
#define D6_pin             6
#define D7_pin             7

//Initialise the LCD
LiquidCrystal_I2C      lcd(I2C_ADDR, En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

int i;    //and integer used to count

void setup()
{
    //Define the LCD as 16 column by 2 rows 
    lcd.begin (16,2);
    
    //Switch on the backlight
    lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
    lcd.setBacklight(HIGH);
    
    //Define the receiver pin and rate
    vw_set_rx_pin(12);       //Sets pin D12 as the RX Pin
    vw_setup(2000);	     // Bits per sec
    vw_rx_start();           // Start the receiver PLL running
}

void loop()
{
   uint8_t buf[VW_MAX_MESSAGE_LEN];
   uint8_t buflen = VW_MAX_MESSAGE_LEN;
   
   if( vw_get_message(buf, &buflen) )
      {
        lcd.setCursor(0, 0);
        lcd.print("distance is:");    
        lcd.setCursor(3,1);  
        
       for (i = 0; i < buflen; i++)
         { 
           lcd.write(buf[i]); 
                    
         }
        
           lcd.print((char)223);
           

      }
 
}