#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);
const int trigpin=8;
const int echo_pin=9;
long duration,distance;
void setup() {
  // put your setup code here, to run once:
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  pinMode(8,OUTPUT);
  pinMode(9, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(8,HIGH);
  delayMicroseconds(20);
  digitalWrite(8,LOW);
  delayMicroseconds(20);
  duration=pulseIn(echo_pin,HIGH);
  distance=0.034*duration/2;
  lcd.setCursor(0,1);
  lcd.print(distance);
  lcd.print("cm");
  delay(100);
}