#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define LCD_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2
#define buzz 18
#define echoPin 2               // CHANGE PIN NUMBER HERE IF YOU WANT TO USE A DIFFERENT PIN
#define trigPin 4               // CHANGE PIN NUMBER HERE IF YOU WANT TO USE A DIFFERENT PIN
int duration, distance;

LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);

void setup(){
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzz, OUTPUT);
  lcd.begin(16,2);
  lcd.init();
  lcd.backlight();
  

}
void loop(){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance = duration / 58.2;
  

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(100);
  lcd.setCursor(5,0);
  lcd.print("Distance");
  lcd.setCursor(5,1);
  lcd.print("   ");
  lcd.setCursor(5,1);
  lcd.print(distance);
  lcd.setCursor(9,1);
  lcd.print("cm");
  if(distance<5)
  {
  
  tone(buzz,1000);
  }
  else
  {
  
  tone(buzz,0);
  }
}