littleBits EasyJam w/Scale Selector

gistfile1.ino

const int noteSelector = A0;
const int oscillator = 5;

const int scaleSelector = A1;
const int barGraph = 9;

int scaleA[] = {0, 2, 4, 5, 7, 9, 11, 12, 12 + 2, 12 + 4, 12 + 5, 12 + 7, 12 + 9, 12 + 11, 12 + 12};
int scaleB[] = {0, 2, 3, 5, 7, 8, 10, 12, 12 + 2, 12 + 3, 12 + 5, 12 + 7, 12 + 8, 12 + 10, 12 + 12};
int scaleC[] = {0, 2, 5, 7, 9, 12, 12 + 2, 12 + 5, 12 + 7, 12 + 9, 12 + 12};
int scaleD[] = {0, 3, 5, 6, 7, 10, 12, 12 + 3, 12 + 5, 12 + 6, 12 + 7, 12 + 10, 12 + 12};
int scaleE[] = {0, 1, 4, 5, 7, 8, 10, 12, 12 + 1, 12 + 4, 12 + 5, 12 + 7, 12 + 8, 12 + 10, 12 + 12};
int* scales[5];
int* scale;

unsigned int lengths[5];

int pitch;
int scaleIndex;
int scaleSize;
int scaleReading;
int scaleNumber;
int graphValue;
int noteReading;

void setup() {
  scales[0] = scaleA;
  scales[1] = scaleB;
  scales[2] = scaleC;
  scales[3] = scaleD;
  scales[4] = scaleE; 
  
  lengths[0] = (sizeof(scaleA) / sizeof(int)) - 1;
  lengths[1] = (sizeof(scaleB) / sizeof(int)) - 1;
  lengths[2] = (sizeof(scaleC) / sizeof(int)) - 1;
  lengths[3] = (sizeof(scaleD) / sizeof(int)) - 1;
  lengths[4] = (sizeof(scaleE) / sizeof(int)) - 1;

  pinMode(oscillator, OUTPUT);
  pinMode(barGraph, OUTPUT);
  
  Serial.begin(9600); 
}

void loop() {
  scaleReading = analogRead(scaleSelector);
  scaleNumber = map(scaleReading, 7, 1016, 0, 4);
  scale = scales[scaleNumber];
  scaleSize = lengths[scaleNumber];
  
  noteReading = analogRead(noteSelector);
  scaleIndex =  map(noteReading, 7, 1016, 0, scaleSize);

  graphValue = (scaleNumber + 1) * 50;
  analogWrite(barGraph, graphValue);
  
  pitch = (scale[scaleIndex] * 4) + 12;
  analogWrite(oscillator, pitch);

  delay(1);
}