#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);


const int trig = 9;  
const int echo = 10; 


long duration;
float distance;

void setup() {
   
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
 
  
  lcd.begin(16, 2);  
  lcd.print("Distance:");  
}

void loop() {
  
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  distance = (duration * 0.03421) / 2;
  lcd.setCursor(0, 1);  
  lcd.print("                ");  
  lcd.setCursor(0, 1);  
  lcd.print(distance);   
  lcd.print(" cm");
  delay(500);
}