#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,4,5,6,7);
const int trig_pin=8;
const int echo_pin=9;
long duration,distance;
void setup()
{
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  pinMode(8, OUTPUT);
  pinMode(9, INPUT);
}
void loop()
{
  digitalWrite(8, HIGH);
  delayMicroseconds(200);
  digitalWrite(8, LOW);
  delayMicroseconds(200);
  duration=pulseIn(9,HIGH);
  distance=duration*.034/2;
  lcd.setCursor(0,1);
  lcd.print(distance);
  lcd.print("cm");
  delay(1000);
}