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

const int buttonPin = 5;
const int buttonPin2 = 6;
const int buttonPin3 = 7;
int lampu_1 = 2;
int lampu_2 = 3;
int kipas = 4;
int ledPin = 8;
int oldValue = LOW; // default/idle value for pin 8 is low.
int oldValue2 = LOW;
int oldValue3 = LOW;

void lcd_i2c(String text = "", int kolom = 0, int baris = 0) {
  byte bar[8] = {
    B11111,
    B11111,
    B11111,
    B11111,
    B11111,
    B11111,
    B11111,
  };
  if (text == "") {
    lcd.init();  //jika error pakai lcd.init();
    lcd.backlight();
    lcd.createChar(0, bar);
    lcd.setCursor(0, 0);
    lcd.print("Loading..");
    for (int i = 0; i < 16; i++) {
      lcd.setCursor(i, 1);
      lcd.write(byte(0));
      delay(100);
    }
    delay(50);
    lcd.clear();
  } else {
    lcd.setCursor(kolom, baris);
    lcd.print(text + "                ");
  }
}

void lampu_1_on() {
  //Aktif low, dibalik jadi High jika terbalik
  digitalWrite(lampu_1, LOW);
}
void lampu_1_off() {
  digitalWrite(lampu_1, HIGH);
}

void lampu_2_on() {
  //Aktif low, dibalik jadi High jika terbalik
  digitalWrite(lampu_2, LOW);
}
void lampu_2_off() {
  digitalWrite(lampu_2, HIGH);
}

void kipas_on() {
  //Aktif low, dibalik jadi High jika terbalik
  digitalWrite(kipas, LOW);
}
void kipas_off() {
  digitalWrite(kipas, HIGH);
}

void setup() 
{
  Serial.begin(115200);
  Serial.println("Press the button.");
  lcd_i2c();
  // Initialize the pin for reading the button.
  pinMode(buttonPin, INPUT);
  pinMode(lampu_1, OUTPUT);
  lampu_1_off();
  pinMode(lampu_2, OUTPUT);
  lampu_2_off();
  pinMode(kipas, OUTPUT);
  kipas_off();
   pinMode(ledPin, OUTPUT); 
}

void loop() 
{
  // Read the value of pin 8.
  int newValue = digitalRead(buttonPin);
  int newValue2 = digitalRead(buttonPin2);
  int newValue3 = digitalRead(buttonPin3);

  // Check if the value was changed,
  // by comparing it with the previous value.
  if(newValue != oldValue)
  {
    if(newValue == HIGH)
    {
      Serial.println("relay hidup.");
      lampu_1_on();
        digitalWrite(ledPin, HIGH); 
      lcd.setCursor(0,0);
      lcd.print("L1:ONN");
    }
    else
    {
      Serial.println("relay mati.");
      lampu_1_off();
        digitalWrite(ledPin, LOW);  
      lcd.setCursor(0,0);
      lcd.print("L1:OFF");
    }
    // Remember the value for the next time.
    oldValue = newValue;
  }
  
  if(newValue2 != oldValue2)
  {
    if(newValue2 == HIGH)
    {
      Serial.println("relay2 hidup.");
      lampu_2_on();
      lcd.setCursor(0,1);
      lcd.print("L2:ONN");
    }
    else
    {
      Serial.println("relay2 mati.");
      lampu_2_off();
      lcd.setCursor(0,1);
      lcd.print("L2:OFF");
    }
    // Remember the value for the next time.
    oldValue2 = newValue2;
  }

   if(newValue3 != oldValue3)
  {
    if(newValue3 == HIGH)
    {
      Serial.println("kipas hidup.");
      kipas_on();
      lcd.setCursor(9,0);
      lcd.print("K:ONN");
    }
    else
    {
      Serial.println("kipas mati.");
      kipas_off();
      lcd.setCursor(9,0);
      lcd.print("K:OFF");
    }
    // Remember the value for the next time.
    oldValue3 = newValue3;
  }

  // Slow down the sketch.
  // Also for debouncing the button.
  delay(100);
}