/*
  File Name Test_DFR_LCD_Keypad.ino

  Utilisation du shield "DFR LCD Keypad.
  Affiche le code et le nom de la touche enfoncée.
  sur le sérial Moniteur

  Status :  OK
*/

#include <LiquidCrystal.h>

//Set up pins for the LCD display
const int RS = 8;
const int EN = 9;
const int d4 = 4;
const int d5 = 5;
const int d6 = 6;
const int d7 = 7;
const int pin_BL = 10; // arduino pin wired to LCD backlight circuit

// Initialize LCD
LiquidCrystal lcd( RS,  EN,  d4,  d5,  d6,  d7);

// define some values used by the panel and buttons
int lcd_key = 0;
int adc_key_in = 0;
#define btnNONE  0
#define btnUP  1
#define btnDOWN  2
#define btnLEFT  3
#define btnRIGHT 4
#define btnSELECT 5

// read the buttons
int read_LCD_buttons()
{
  adc_key_in = analogRead(0); // read the value from the sensor
  // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
  // we add approx 50 to those values and check to see if we are close
  if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
  // For Version DFR LCD Keypad
  if (adc_key_in < 50)  return btnRIGHT;
  if (adc_key_in < 195) return btnUP;
  if (adc_key_in < 380) return btnDOWN;
  if (adc_key_in < 555) return btnLEFT;
  if (adc_key_in < 790) return btnSELECT;
  return btnNONE; // when all others fail, return this...
}

void setup() {
  Serial.begin(115200);
  // affichage Serial Moniteur
  Serial.println("Test_LCD_Keypad_shield_1");
  Serial.println("Version 1.0");
  Serial.println("\nPush the buttons");

  // affichage LCD 1602
  lcd.begin(16, 2); // start the library  // mesage d'acceuil
  lcd.setCursor(0, 0);
  lcd.print("Test_LCD_Keypad_shield_1");
  lcd.setCursor(3, 1);
  lcd.print("Version 1.0");
  delay(2000);
  lcd.clear();
  lcd.print("Push the buttons"); // print a simple message
}

void loop() {
  lcd.setCursor(11, 1);  // move cursor to second line "1" and 9 spaces over  lcd.print(millis() / 1000);    // display seconds elapsed since power-up
  lcd.setCursor(0, 1);  // move to the begining of the second line
  lcd_key = read_LCD_buttons(); // read the buttons

  switch (lcd_key)  // depending on which button was pushed, we perform an   // affiche le nom du bouton enfoncé
  {
    case btnRIGHT:
      {
        lcd.print(btnRIGHT);
        lcd.print(" RIGHT ");
        break;
      }
    case btnLEFT:
      {
        lcd.print(btnLEFT);
        lcd.print(" LEFT ");
        break;
      }
    case btnUP:
      {
        lcd.print(btnUP);
        lcd.print(" UP     ");
        break;
      }
    case btnDOWN:
      {
        lcd.print(btnDOWN);
        lcd.print(" DOWN   ");
        break;
      }
    case btnSELECT:
      {
        lcd.print(btnSELECT);
        lcd.print(" SELECT ");
        break;
      }
    case btnNONE:
      {
        lcd.print(btnNONE);
        lcd.print(" NONE  ");
        break;
      }
  }
}