#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,4,5,6,7);
const int tp=8;
const int ep=9;
int dur,dist;
void setup(){
  lcd.begin(16,2);
  lcd.setCursor(0,0);
  pinMode(8, OUTPUT);
  pinMode(9, INPUT);

}

void loop(){
  digitalWrite(8, HIGH);
  delayMicroseconds(20);
  digitalWrite(8, LOW);
  delayMicroseconds(20);
  dur=pulseIn(ep,HIGH);
  dist=(dur*0.034)/2;
  lcd.setCursor(0,1);
  Serial.println(dist);
  Serial.println("cm");
  delay(100);

}