#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, jarakInch;

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(jarakCm);
  lcd.print("cm");
  delay(10);
  lcd.setCursor(0,1);
  lcd.print("Jarak = ");
  lcd.print(jarakInch);
  lcd.print("Inch");
  delay(10);

  if (jarakCm <=100){
    tone(buzzer, 1300);
    delay(400);
    noTone(8);
    delay(100);
  }


}