#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8 , 7);

//Variables for "HC-SR04"
int echo = 2;
int trig = 3;
int piezo = 13;

long duration = 0;
int cm = 0;
int inch = 0;

void setup() {
  Serial.begin(9600);

  pinMode(trig , OUTPUT);
  pinMode(echo , INPUT);
  pinMode(piezo, OUTPUT);

  tone(13,100,100);

  lcd.begin(16,2);
}

void loop() {
  digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  digitalWrite(trig, LOW);
  digitalWrite(piezo, HIGH);
  tone(13,100,100);

  duration = pulseIn(echo,HIGH);
  cm = duration*0.034/2;
  inch = duration*0.0133/2;

  Serial.print("CM: ");
  Serial.println(cm);
  Serial.print("Inch: ");
  Serial.println(inch);

  lcd.setCursor(0, 0);
  lcd.print("Value  CM ");
  lcd.setCursor(11, 0);
  lcd.println(float(cm));

  lcd.setCursor(0, 1);
  lcd.print("Value Inch");
  lcd.setCursor(11, 1);
  lcd.println(float(inch));

  delay(1000);
}