#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define TRIG_PIN 23 
#define ECHO_PIN 19
float duration_us, distance_cm;
void setup() {
  lcd.init();               
  lcd.backlight();          
  pinMode(TRIG_PIN, OUTPUT); 
  pinMode(ECHO_PIN, INPUT);  
}
void loop() {
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration_us = pulseIn(ECHO_PIN, HIGH);
  distance_cm = 0.017 * duration_us;
  lcd.clear();
  lcd.setCursor(0, 0); 
  lcd.print("Distance: ");
  lcd.print(distance_cm);
  delay(500);
}