#include <LiquidCrystal.h>
LiquidCrystal lcd(21, 19, 18, 5, 4, 2);
const int trigP = 15;
const int echoP = 22;
long duration;
int distance;

void setup()
{
  pinMode(trigP, OUTPUT);
  pinMode(echoP, INPUT);
  lcd.begin(16, 2);
}

void loop()
{
  digitalWrite(trigP, LOW);
  delayMicroseconds(2);
  digitalWrite(trigP, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigP, LOW);
  duration = pulseIn(echoP, HIGH);
  distance = duration * 0.034 / 2;
  lcd.setCursor(0, 0);
  lcd.print("Distance=");
  lcd.print(distance);
  lcd.print("cm");
  delay(1000);
}