#include <LiquidCrystal.h>
#define BUTTON_UP 0x08     
#define BUTTON_DOWN 0x04   
#define BUTTON_LEFT 0x10   
#define BUTTON_RIGHT 0x02  
#define BUTTON_SELECT 0x01 

#define BL_OFF   0
#define RED      1
#define GREEN    2
#define YELLOW   3
#define BLUE     4
#define PURPLE   5
#define TEAL     6
#define WHITE    7

#define LCD_Backlight 10
#define Red 6
#define Green 5
#define Blue 3

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

uint8_t readButtons();
void setBacklight(uint8_t status);

uint8_t readButtons() { 
  uint8_t reply = 0x00;
  float select_voltage = analogRead(0) * (5.0 / 1023.0);
  float up_voltage = analogRead(2) * (5.0 / 1023.0);
  float down_voltage = analogRead(3) * (5.0 / 1023.0);
  float right_voltage = analogRead(4) * (5.0 / 1023.0);
  float left_voltage = analogRead(1) * (5.0 / 1023.0);

  if(right_voltage == 0) reply |= (1UL << 1);//BUTTON_RIGHT
  if(up_voltage == 0) reply |= (1UL << 3);//BUTTON_UP
  if(down_voltage == 0) reply |= (1UL << 2);//BUTTON_DOWN
  if(left_voltage == 0) reply |= (1UL << 4);//BUTTON_LEFT
  if(select_voltage == 0) reply |= (1UL << 0);//BUTTON_SELECT
  return reply;
}

// Function to set the backlight (RGB LED here)
void setBacklight(uint8_t status) {
  //Set LED RGB light by providing rgb values (0-255)
  switch(status){
    case BL_OFF:
    {
      analogWrite(Red, 0);
      analogWrite(Green, 0);
      analogWrite(Blue, 0);
      break;
    }
    case WHITE:
    {
      analogWrite(Red, 255);
      analogWrite(Green, 255);
      analogWrite(Blue, 255);
      break;
    }
    case RED:
    {
      analogWrite(Red, 255);
      analogWrite(Green, 0);
      analogWrite(Blue, 0);
      break;
    }
    case GREEN:
    {
      analogWrite(Red, 0);
      analogWrite(Green, 255);
      analogWrite(Blue, 0);
      break;
    }
    case BLUE:
    {
      analogWrite(Red, 0);
      analogWrite(Green, 0);
      analogWrite(Blue, 255);
      break;
    }
    case YELLOW:
    {
      analogWrite(Red, 255);
      analogWrite(Green, 255);
      analogWrite(Blue, 0);
      break;
    }
    case PURPLE:
    {
      analogWrite(Red, 128);
      analogWrite(Green, 0);
      analogWrite(Blue, 128);
      break;
    }
    case TEAL:
    {
      analogWrite(Red, 0);
      analogWrite(Green, 128);
      analogWrite(Blue, 128);
      break;
    }    
  }
}
void setup() {
  
  Serial.begin(9600);
  
  lcd.begin(16, 2);
  
 
  pinMode(LCD_Backlight, OUTPUT);

  digitalWrite(LCD_Backlight, HIGH);

  lcd.clear();
  
  pinMode(Red, OUTPUT);
  pinMode(Green, OUTPUT);
  pinMode(Blue, OUTPUT);  

}
void loop() {
  lcd.setCursor(0, 0);
  lcd.print("Basilan buton:");
 
  lcd.setCursor(0, 1);
   
     byte pressedButton = readButtons();
  
  if(pressedButton & BUTTON_RIGHT){
    lcd.print("      Sag     ");
    setBacklight(RED);
  }
    if(pressedButton & BUTTON_UP){
    lcd.print("       Yukari       ");
    setBacklight(GREEN);
  }
  
  if(pressedButton & BUTTON_DOWN){
    lcd.print("      Asagi      ");
    setBacklight(BLUE);
  }
    if(pressedButton & BUTTON_LEFT){
    lcd.print("      sol      ");
    setBacklight(YELLOW);
  }
    if(pressedButton & BUTTON_SELECT){
    lcd.print("     Seciniz     ");
    setBacklight(PURPLE);
  }
    if(!pressedButton){
    lcd.print("                ");
    setBacklight(WHITE);
  }
}