#include <LiquidCrystal.h>
int trigpin = 12;
int echopin = 11;
int butpin = 8;
int time;
int distance;
int butval;
LiquidCrystal lcd(2,3,4,5,6,7);
void setup() {
  // put your setup code here, to run once:
pinMode(trigpin, OUTPUT);
pinMode(echopin, INPUT);
pinMode(butpin, INPUT);
digitalWrite(butpin, HIGH);
lcd.begin(16,2);
}

void loop() {
  // put your main code here, to run repeatedly:
butval = digitalRead(butpin);
if (butval == 0){
  digitalWrite(trigpin, LOW);
  delayMicroseconds(10);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);
  time = pulseIn(echopin,HIGH);
  distance = time * (765 * 5280 * 12) / (3600 * 1000000);
  lcd.setCursor(0,0);
  lcd.print("distance in inch.");
  lcd.setCursor(0,1);
  lcd.print(distance);
}
}