#include <openGLCD.h>

int vuMeterBar[] = {8, 15, 22, 29, 36, 43, 50, 57, 64, 71, 78, 85, 92, 99, 106, 113, 120};
float dBAudio;
float newZero = 512;
int dbPerBar = 3;
float currADC;

void setup()
{
  GLCD.Init();

  GLCD.SelectFont(Wendy3x5);

  //GLCD.DrawLine(0, 11, 128, 11);
  //GLCD.DrawLine(7, 12, 7, 30);
  //GLCD.DrawLine(0, 31, 128, 31);
}

void loop()
{
  GLCD.GotoXY(2, 13);
  GLCD.print("L");
  GLCD.GotoXY(2, 27);
  GLCD.print("R");

  getPPMsample();

  for (int bar = 0; bar < 17; bar++)
  {
    if (abs(dBAudio) >= (bar * dbPerBar) + 0.1)
    {
      GLCD.FillRect(vuMeterBar[bar], 14, 6, 3);   // left
      //GLCD.FillRect(vuMeterBar[bar], 28, 6, 3); // right
    }
  }

  for (int i = 1; i <= 17; i ++)
  {
    if (currADC >= 60 * i)
    {
      GLCD.FillRect(vuMeterBar[i - 1], 28, 6, 3); // right
    }
  }

  GLCD.GotoXY(2, 45);
  GLCD.print(dBAudio);
  GLCD.GotoXY(2, 52);
  GLCD.print(currADC);

  delay(100);
  GLCD.ClearScreen();
}


void getPPMsample()
{
  float maxAudio = 0;
  float rawAudio;
  for (int sample = 0; sample < 48; sample++)
  {
    rawAudio = analogRead(A1);
    if (rawAudio > maxAudio)
      maxAudio = rawAudio;
  }
  currADC = maxAudio;
  dBAudio = 20 * log10 (abs(maxAudio - newZero) / newZero);
}