#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
const int pingpin = 14;
void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(3, 0);
  lcd.print("Start Mesure");
  delay(2000);
  lcd.clear();
}
void loop() {
  long dura, inches, cm;
  //-----------Triger----------------
  pinMode(pingpin, OUTPUT);
  digitalWrite(pingpin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingpin, HIGH);
  delayMicroseconds(5);
  digitalWrite(pingpin, LOW);
  //------------Readback-------------
  pinMode(pingpin, INPUT);
  dura = pulseIn(pingpin, HIGH);
  cm = microsecondsToCentimeters(dura);
  lcd.setCursor(3, 0);
  // lcd.autoscroll();
  lcd.print("Distance:");
  lcd.setCursor(5, 1);
  // lcd.noAutoscroll();
  lcd.print(cm);
  lcd.setCursor(9, 1);
  lcd.print("cm");
  Serial.print(cm);
  Serial.println("cm");
  delay(100);
}
long microsecondsToCentimeters(long microseconds) {
  return microseconds / 29 / 2;
}