//code by Chris Ball - chrisballprojects.wordpress.com
//modified by Angel Palomares, works 100%

const int notes=6;          // set up number of notes

boolean notePlaying[notes];  //note states array: keeps track of whether a MIDI note is "on" or "off"

int scale[notes]={0,2,4,5,7,9}; //major scale

int beginNote=0X3C;                                  //starting note value (default middle C)

int threshold=40;                                //value which analogRead() must cross for a midi note to be triggered

boolean midiMode=true;                          //set this to "true" before uploading MIDI firmware (http://hunt.net.nz/users/darran/weblog/52882/Arduino_UNO_MIDI_USB_version_02.html) to 16u2


void setup(){
  if(midiMode){
    pinMode(A0, INPUT_PULLUP);
    pinMode(A1, INPUT_PULLUP);
    pinMode(A2, INPUT_PULLUP);
    pinMode(A3, INPUT_PULLUP);
    pinMode(A4, INPUT_PULLUP);
    pinMode(A5, INPUT_PULLUP);
    Serial.begin(115200);           //midi USB baud rate = 115200
  }else{
    pinMode(A0, INPUT_PULLUP);
    pinMode(A1, INPUT_PULLUP);
    pinMode(A2, INPUT_PULLUP);
    pinMode(A3, INPUT_PULLUP);
    pinMode(A4, INPUT_PULLUP);
    pinMode(A5, INPUT_PULLUP);
    Serial.begin(9600);           //for testing values
  }
}

void loop() { 
  for(int i=0;i<notes;i++){   
    
    if((analogRead(i)>threshold)&&(notePlaying[i]==false)){        //note on & CC messages
      int note=beginNote+scale[i];
      midiMessage(0x90, note, 65);//, 100);                          
      notePlaying[i]=true;                                               
    }
    
    if((analogRead(i)<threshold)&&(notePlaying[i]==true)){        //note off messages
      int note=beginNote+scale[i];
      midiMessage(0x80, note, 65);//, 0);
      notePlaying[i]=false;                                         
    }
  }
}

void midiMessage(int commandByte, int channelByte, int data1Byte)//, int data2Byte) 
{
  if(midiMode){
    Serial.write(commandByte);
    Serial.write(channelByte);
    Serial.write(data1Byte);
   // Serial.write(data2Byte);
  }else{
    if(commandByte==0x90){
      Serial.print("Note On message: note ");
    }else if(commandByte==0x80){
      Serial.print("Note Off message: note ");
    }
    Serial.print(data1Byte);
    Serial.print(", velocity ");
    //Serial.print(analogRead(A0));
//    Serial.println(data2Byte);
  }
}