#include <LiquidCrystal.h>
LiquidCrystal lcd (12,11,4,5,6,7);

const int trig_pin =2;
const int echo_pin =3;

long duration;
float distance;

void setup() {
pinMode(trig_pin, OUTPUT);
pinMode(echo_pin, INPUT);
lcd.begin(16,2);
Serial.begin(9600);
}

void loop() {

Serial.print("\n");

digitalWrite(trig_pin, LOW);
delayMicroseconds(5);
digitalWrite(trig_pin, HIGH);
delayMicroseconds(10);
digitalWrite(trig_pin, LOW);

duration = pulseIn(echo_pin,HIGH);

double distance =(0.0343/2)*duration;//in cm
Serial.print("Distance: ");
Serial.print(distance);
Serial.print("  cm");

lcd.setCursor(0,0);
lcd.print("Distance is:  ");

lcd.setCursor(0,1);
lcd.print(distance);
lcd.print(" cm");

}