#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigPin = 6;
const int echoPin = 7;
int buzzer =8;

long duration;
int jarakCm, jrakInch;

void setup(){
lcd.begin(12,2);

pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
}

void loop(){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

 duration = pulseIn(echoPin, HIGH)
 'jarakCm'= duration*0.034/2;
 'jarakInch' = duration*0.0133/2;

 lcd.setCursor(0,0);
 lcd.print("jarak: ");
 lcd.print(" cm ");
 delay(10);
 lcd.setCursor(0,1);
 lcd.print("jarak: ");
 lcd.print(jarakInch);
 lcd.print(" inch ");
 delay(10);

if (jarakCm <=5) {

 tone(buzzer,1030);
 delay(400);
 noTone(8);
 delay(100);
}

}