//#define debugKeys

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




// read the buttons
int read_LCD_buttons()
{
  adc_key_in = analogRead(0);      // read the value from the sensor

#ifdef debugKeys
  lcd.setCursor(7, 1);           // move cursor to second line "1" and 7 spaces over
  sprintf(str, "%-4d", adc_key_in);
  lcd.print(str);    
#endif

  // 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 V1.1 us this threshold
  if (adc_key_in < 50)   return btnRIGHT;
  if (adc_key_in < 250)  return btnUP;
  if (adc_key_in < 450)  return btnDOWN;
  if (adc_key_in < 650)  return btnLEFT;
  if (adc_key_in < 850)  return btnSELECT;

  // For V1.0 comment the other threshold and use the one below:
  /*
   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...
}




    
    
    
    
    
    
    
#if 0
  lcd.setCursor(0, 1);           // move to the begining of the second line
  switch (lcd_key)               // depending on which button was pushed, we perform an action
  {
    case btnRIGHT:
      {
        lcd.print("RIGHT ");
        break;
      }
    case btnLEFT:
      {
        lcd.print("LEFT   ");
        break;
      }
    case btnUP:
      {
        lcd.print("UP    ");
        break;
      }
    case btnDOWN:
      {
        lcd.print("DOWN  ");
        break;
      }
    case btnSELECT:
      {
        lcd.print("SELECT");
        break;
      }
    case btnNONE:
      {
        lcd.print("NONE  ");
        break;
      }
  }
  sprintf(str, "%5d", millis() / 1000);
  lcd.setCursor(11, 1);  //
  lcd.print(str);        // display seconds elapsed since power-up
#endif