#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define LCD_ADDRESS 0x27 
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);
const int trigPin = 2;
const int echoPin = 3;
void setup() {
  Wire.begin();
  lcd.init();
  lcd.backlight();
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);  
  Serial.begin(9600);
}
void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin, HIGH);
  int distance = duration * 0.034 / 2;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Mesafe: ");
  lcd.print(distance);
  lcd.print(" cm");
  Serial.print("Mesafe: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(1000); 
if (Serial..available()<50){a=SErial/Read();Serial.println(a);}
}