#include <LiquidCrystal.h>
#define PIN_TRIG 11
#define PIN_ECHO 10
#define PIN_LED 1
#define PIN_BUZZER 2

LiquidCrystal  lcd(12, 11, 10, 9, 8, 7);

void setup() {
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(PIN_LED, OUTPUT);
  pinMode(PIN_BUZZER, INPUT);

  digitalWrite(PIN_BUZZER, LOW);
}

void loop() {
//membaca sensor ultrasonik
digitalWrite(PIN_TRIG, HIGH);
delayMicroseconds(10);
digitalWrite(PIN_TRIG, LOW);
int duration = pulseIn(PIN_ECHO, HIGH);
int jarak = duration/ 58;

//menampilkan di layar
lcd. begin(16, 2);
lcd. print("Jarak : ");
lcd. print(jarak);
lcd. print(" cm");

//menentukan delay kedipan

if(jarak <= 100){
  berkedip3();
} else if (jarak <=200){
  berkedip2();
} else {
  berkedip1();
}
delay(100);
}

void berkedip1() {
  digitalWrite(PIN_LED, HIGH);
  tone(PIN_BUZZER, 8000);
  delay(2894);
  digitalWrite(PIN_LED, LOW);
  noTone(PIN_BUZZER);
  delay(2894);
}

void berkedip2() {
  digitalWrite(PIN_LED, HIGH);
  tone(PIN_BUZZER, 8000);
  delay(600);
  digitalWrite(PIN_LED, LOW);
  noTone(PIN_BUZZER);
  delay(600);
}

void berkedip3() {
  digitalWrite(PIN_LED, HIGH);
  tone(PIN_BUZZER, 8000);
  delay(300);
  digitalWrite(PIN_LED, LOW);
  noTone(PIN_BUZZER);
  delay(300);
}