#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 4, d5 = 5, d6= 6, d7 = 4;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
#define trig 3
#define echo 2
int distance;
int time1;
void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  Serial.begin(9600);
  lcd.begin(16, 2);
}
void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(5);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  time1 = pulseIn(echo, HIGH);
  distance = time1 * 0.0343/2;
  Serial.println(distance);
  delay(5);
}