#include <HCSR04.h>
#include <LiquidCrystal_I2C.h>
const int pinBuzzer=7; 

LiquidCrystal_I2C lcd(0x27,16,2);
HCSR04 hc(5,6);

void setup() {
  lcd.init ();
  lcd.setBacklight(HIGH);
  pinMode(pinBuzzer ,OUTPUT);
}

void loop() {
  lcd.setCursor(0,0);
  lcd.print("Jarak : ");
  if(hc.dist()<=10)
{
   lcd.print(hc.dist());
   lcd.print(" cm");
   delay(1000);
   digitalWrite(pinBuzzer ,HIGH);
   delay(1000);
}
else
{
  lcd.print(hc.dist());
  lcd.print(" cm");
  delay(1000);
  digitalWrite(pinBuzzer,LOW);
  delay(1000);
  digitalWrite(pinBuzzer,LOW);
  lcd.clear();
}

}