#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;
int jarakInch;

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

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
  pinMode(7, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);

}

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("JarakInch: ");
  lcd.print(" inch ");
  delay(10);

  if (jarakCm <=5) {
    tone(buzzer, 1030);
    delay(400);
    noTone(8);
    delay(100);
    digitalWrite(7, HIGH);
    delay(500);
    digitalWrite(7, LOW);
    delay(500);
    digitalWrite(4, HIGH);
    delay(500);
    digitalWrite(4,LOW);
    delay(500);
    digitalWrite(2, HIGH);
    delay(500) ;
    digitalWrite(2, LOW);
    delay(500);

  




  }
}