#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
int tPin = 6;
int ePin = 5;
LiquidCrystal_I2C lcd(0x27,16,2);
long distance, duration;

void setup()
{
  lcd.init();
  lcd.backlight();
  pinMode(tPin, OUTPUT);
  pinMode(ePin, INPUT);
  Serial.begin(9600);
}

void loop()
{
  lcd.setCursor(0,0);
  lcd.print("distance = ");
  lcd.print(distance);

  digitalWrite(tPin, LOW);
  delayMicroseconds(2);
  digitalWrite(tPin, HIGH);
  delayMicroseconds(10);
  duration = pulseIn(ePin, HIGH);
  distance = (duration/2)/29.1;

  if(distance < 15)
  {
    Serial.println("too close");
    lcd.setCursor(0,1);
    lcd.print("too close");
  }
  else if(distance > 15 && distance < 50)
  {
    Serial.println("safe distance");
    lcd.setCursor(0,1);
    lcd.print("safe distance");
  }
  else if(distance > 50)
  {
    Serial.println("long distance");
    lcd.setCursor(0,1);
    lcd.print("long distance");
  }
  Serial.print("distance: ");
  Serial.println(distance);

  delay(500);
  lcd.clear();
}