#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define TRIG_PIN 9
#define ECHO_PIN 10
float distance_cm;
void setup(){
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(4, 0);
  lcd.print("Distance");
}
void loop(){
  ultrasonicMeasure();
  lcd.setCursor(4, 1);
  lcd.print(distance_cm);
  lcd.print("Cm");
  delay(500);
}
float ultrasonicMeasure(){
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  float duration_us = pulseIn(ECHO_PIN, HIGH);
  distance_cm = 0.01712 * duration_us;
  return distance_cm;
}