#include <SPI.h>
#include <ShiftOutX.h>
#include <ShiftPinNo.h>

/*
 * LED driver
 * Use 4 595 SR with ShiftOutX
 * on pin 8, 11, 12
 * plus one 33rd LED driven by
 * Arduino pin 13.
 *
 * */

shiftOutX shiftRegisters(8, 11, 12, MSBFIRST, 4);

void setLed(int led, boolean state){
  if(led>0 && led<33){
    if(state){
      shiftRegisters.pinOn(led);
    }else{
      shiftRegisters.pinOff(led);
    }
  }
  if(led==33){
    digitalWrite(13, state);
  }
}

/*
 * Default Sound reactive Pattern
 *
 * */

// 2 level array to store pixels of each level
int srd_levels[][5] = {{ 1,  0,  0,  0,  0}
                    , { 2,  0,  0,  0,  0}
                    , { 3,  6, 14,  0,  0}
                    , { 4,  7, 15,  0,  0}
                    , { 5,  8, 10, 16, 21}
                    , { 9, 11, 17, 22,  0}
                    , {12, 18, 23, 28,  0}
                    , {13, 19, 24, 29,  0}
                    , {20, 25, 30,  0,  0}
                    , {26, 31,  0,  0,  0}
                    , {27, 32,  0,  0,  0}
                    , {33,  0,  0,  0,  0}};

void loopSoundReactDiagonal()
{
  // read input fro pin 0
  int sound = analogRead(0);

  // read the potentiometer value
  // be sure to have a value between 0 and 2
  float p = analogRead(5)/1024.0F*2;

  // by multiplying sound by p
  // the potentiometer can adjust the level
  // of sensibility
  sound = sound * p;


  int i = 0;
  int j = 1;

  // let's scan the 12 levels of sensibility
  while(i<=11)
  {
    int cnt=0;
    // is the sound value higher than the
    // current level (i) sensibility
    boolean isok = sound>256/31*j;

    // scan the current level pixels and
    // set them on or off
    while(cnt<=4){
      setLed(srd_levels[i][cnt], isOk)
      cnt++;
    }
    i++;
    j++;
  }

  // small delay
  delay(10);
}

/*
 * Arduino functions
 *
 * */

void setup(){
  pinMode( 8, OUTPUT); // SR latch
  pinMode(11, OUTPUT); // SR data
  pinMode(12, OUTPUT); // SR clock
  pinMode(13, OUTPUT); // pixel #33
}

void loop(){
  loopSoundReactDiagonal() ;
}