const int DELAY = 500;
enum T_Note {
  C4,
  D,
  E,
  F,
  G,
  A,
  B,
  C5,
  PAUSE,
};

const byte KEY = A0;
const byte MODE = 6;
const byte SOUNDER = 7;const int DELAY = 500;
enum T_Note {
  C4,
  D,
  E,
  F,
  G,
  A,
  B,
  C5,
  PAUSE,
};

const byte KEY = A0;
const byte MODE = 6;
const byte SOUNDER = 7;
const byte LED_REC;
const byte LED_PLAY;
const byte LCD_D4 = 10;
const byte LCD_D5 = 11;
const byte LCD_D6 = 12;
const byte LCD_D7 = 13;
const byte LCD_E = 9;
const byte LCD_RS = 8;

const int notes[] = {262, 294, 330, 349, 392, 440, 494, 523, 0};
const int NUM_OF_NOTES = PAUSE; //PAUSE is the last enum value of Note
const float noteRanges[NUM_OF_NOTES][2] = {

                                            {0.100, 0.459},
                                            {0.460, 0.842},
                                            {0.843, 1.218},
                                            {1.219, 1.599},
                                            {1.600, 1.910},
                                            {1.911, 2.139},
                                            {2.140, 2.377},
                                            {2.378, 3.000}
                                          };
float convToV(int in)
{
  return in * (5.0/1023);
}

int notePressed(float note)
{
  for(size_t i = 0; i < NUM_OF_NOTES; i++)
  {
    if(note >= noteRanges[i][0] && note <= noteRanges[i][1])
    {
      return i;
    }
  }
  return PAUSE;
}

void setup()
{
  Serial.begin(9600);
  pinMode(KEY, INPUT);
}



void loop()
{
  float in = convToV(analogRead(KEY));//input voltage
  Serial.print(in);
  switch(notePressed(in))
  {
    case C4:
     Serial.println(" C4 ");
      break;

    case D:
      Serial.println("  D ");
      break;

    case E:
      Serial.println("  E ");
      break;

    case F:
      Serial.println("  F ");
      break;

    case G:
      Serial.println("  G ");
      break;

    case A:
      Serial.println("  A ");
      break;

    case B:
      Serial.println("  B ");
      break;

    case C5:
      Serial.println("  C5 ");
      break;

    case PAUSE:
      Serial.println("  PPause ");
  }

  delay(DELAY);
}