#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);

const int trigpin=10;
const int echopin = 9;

void setup() {
  // put your setup code here, to run once:
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Welcome!!");
  delay(1000);
  //lcd.clear();
  //lcd.setCursor(0,0);

}

void loop() {
  // put your main code here, to run repeatedly:
   lcd.setCursor(0,2);
   lcd.print("distance: ");
   lcd.print(distance());
}
float distance(){
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);
  long duration = pulseIn(echopin, HIGH);
  float distance = duration * 0.0343 / 2.0; // Use a more precise factor
  
  return distance;

}