// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>


/************************************************************
/
/Please note that this TinkerCAD sketch provides a reduced down
/version of the Adafruit_RGBLCDShield library. This library
/does not support buttons functionality nor does it support
/backlight colour changing.
/
/We have added buttons functionality to the sketch which can
/be accessed in the same manner as the Adafruit_RGBLCDShield
/library, but instead of calling lcd.readButtons(), you 
/can directly call readButtons() for the same effect.
/
/As for the backlight colour, we have added an RGB LED which
/can be used instead of the coloured lcd background.
/This can be accessed in the same manner as the
/Adafruit_RGBLCDShield library, but instead of calling
/lcd.setBacklight(uint8_t status), you can directly call
/setBacklight(uint8_t status) for the same effect.
/
************************************************************/

// DONT CHANGE ANYTHING BETWEEN HERE AND THE LINE
// SAYING "END OF LBORO CODE"

#define BUTTON_UP 0x08     //!< Up button
#define BUTTON_DOWN 0x04   //!< Down button
#define BUTTON_LEFT 0x10   //!< Left button
#define BUTTON_RIGHT 0x02  //!< Right button
#define BUTTON_SELECT 0x01 //!< Select button

#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 pins for LCD Backlight and RGB for LED light
#define LCD_Backlight 10
#define Red 6
#define Green 5
#define Blue 3

//Set pins for LCD
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

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



//Reads pressed buttons and return a single int with bits 
//representing pressed buttons (1 for pressed, 0 for not pressed)
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;
    }    
  }
}

// END OF LBORO CODE


void setup() {
  //Setup serial port
  Serial.begin(9600);
  //Initialise LCD screen
  lcd.begin(16, 2);
  
  // DON'T REMOVE THESE LINES
  //Set Backlight pin to OUTPUT
  pinMode(LCD_Backlight, OUTPUT);
  //Set LCD Backlight to high
  digitalWrite(LCD_Backlight, HIGH);
  //Clear lcd
  lcd.clear();
  //Set LED RGB pins to OUTPUT
  pinMode(Red, OUTPUT);
  pinMode(Green, OUTPUT);
  pinMode(Blue, OUTPUT);  

  // Put your code here.
  // ...
}

void loop() {
  // This is example code.  You should delete
  // all of this and replace it with your ideas.
  
  //Set LCD crusor at the beging of the first line
  lcd.setCursor(0, 0);
  lcd.print("Button pressed:");
  
  //Set LCD crusor at the beging of the second line
  lcd.setCursor(0, 1);
  
  //Print which button is pressed and
  //activate the corresponding LED RGB light
  byte pressedButton = readButtons();
  
  //Check if RIGHT button is pressed
  if(pressedButton & BUTTON_RIGHT){
    lcd.print("      Right     ");
    setBacklight(RED);
  }
  //Check if UP button is pressed
  if(pressedButton & BUTTON_UP){
    lcd.print("       Up       ");
    setBacklight(GREEN);
  }
  //Check if DOWN button is pressed
  if(pressedButton & BUTTON_DOWN){
    lcd.print("      Down      ");
    setBacklight(BLUE);
  }
  //Check if LEFT button is pressed
  if(pressedButton & BUTTON_LEFT){
    lcd.print("      Left      ");
    setBacklight(YELLOW);
  }
  //Check if SELECT button is pressed
  if(pressedButton & BUTTON_SELECT){
    lcd.print("     Select     ");
    setBacklight(PURPLE);
  }
  //If no buttons are pressed clear line
  if(!pressedButton){
    lcd.print("                ");
    setBacklight(WHITE);
  }
}