#include <LiquidCrystal_I2C.h>
#define LCD_BACKLIGHT 10

LiquidCrystal_I2C lcd(0x27, 20, 4);

int buzzerPin = 12;
int ledPin = 13;                // choose the pin for the LED
// int inputPin = 2;               // choose the input pin (for PIR sensor)
// int pirPin[4] = {0, 1, 2, 3};
int pirPinOne = 0;
int pirPinTwo = 1;
int pirPinThree = 2;
int pirPinFour = 3;
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status

void setup() {
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input
  pinMode(pirPinOne, INPUT);
  pinMode(pirPinTwo, INPUT);
  pinMode(pirPinThree, INPUT);
  pinMode(pirPinFour, INPUT);

  // for (int i = 0; i < 4; i++) {
  //   pinMode(pirPin[i], INPUT);     // declare sensor as input
  // }

  lcd.init();
  lcd.begin(16, 2);
  analogWrite(LCD_BACKLIGHT, 10);

  Serial.begin(9600);
}

void loop() {

  val = digitalRead(pirPin[0]);
  val = digitalRead(pirPin[1]);
  val = digitalRead(pirPin[2]);
  val = digitalRead(pirPin[3]);

  // val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    lcd.setCursor(0, 0);
    lcd.print("Terdeteksi!");

    switch (val) {
      case 0: 
        lcd.setCursor(1, 1);
        lcd.print("Lokasi: teras.");
        break;
      case 1: 
        lcd.setCursor(0, 1);
        lcd.print("Lokasi: belakang.");
        break;
      case 2: 
        lcd.setCursor(1, 1);
        lcd.print("Lokasi: garasi");
        break;
      case 3: 
        lcd.setCursor(1, 1);
        lcd.print("Lokasi: jendela.");
        break;
      default:
        lcd.setCursor(1, 1);
        lcd.print("Lokasi: unknown.");
        break;
    }

    turnAlarm(buzzerPin);         // turn on alarm
    for (int i = 0; i < 10; i++) {
      digitalWrite(ledPin, HIGH);  // turn LED ON
      delay(50);
      digitalWrite(ledPin, LOW);
    }

    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    digitalWrite(ledPin, LOW); // turn LED OFF

    if (pirState == HIGH) {
      // we have just turned of
      lcd.clear();
      Serial.println("Motion ended!");
      lcd.print("Aman.");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}

void blinkLed(int pin) {
  for (int i = 0; i < 10; i++) {
    digitalWrite(pin, HIGH);
    delay(200);
    digitalWrite(pin, LOW);
  }
}

void turnAlarm(int pin) {
  tone(pin, 1000, 500);
  delay(200);
  noTone(pin);
}