#include <LiquidCrystal.h>
LiquidCrystal lcd(22, 21, 13, 12, 14, 27);
const int trgpin = 5;
const int echopin = 18;

#define SOUND_SPEED 0.034
long duration;
float distance;
void setup()
{
    lcd.begin(16, 2);
    pinMode(trgpin, OUTPUT);
    pinMode(echopin, INPUT);
}

void loop()
{
    digitalWrite(trgpin, LOW);
    delayMicroseconds(2);
    digitalWrite(trgpin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trgpin, LOW);

    duration = pulseIn(echopin, HIGH);

    distance = duration * SOUND_SPEED / 2;

    lcd.setCursor(0, 0);
    lcd.print("Distance in CM: ");
    lcd.setCursor(1, 1);
    lcd.print(distance);
}