#include <LiquidCrystal.h>

#define trig 18
#define echo 19

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
float t=0,d=0;

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16,2);
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  t = pulseIn(echo, HIGH);
  d = t * 0.0340 / 2;
  d = t * 0.01330 / 2;
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(d);
  lcd.print(" cm");
  delay(1000); 
}