These modules enable the reading of midi signals over a HardwareSerial or SoftwareSerial on an Arduino.

For barebones usage, you can simply read signals and attach callbacks to MIDI_NOTE_ON and MIDI_NOTE_OFF.

For stronger usage, you can build entire songs or songbanks, which have their own callbacks for failure or completion. E.g. someone plays a MIDI keyboard, hooked up to your Arduino, and if they play a given song all the way through with no wrong notes, the completion callback which you designate for that song becomes triggered.

###Barebones listener example (see also the examples dir):

#include <Arduino.h>
#include <SoftwareSerial.h>
#include "midi-listener.h"

/* callback for MidiListener */
void noteOn( unsigned char note, unsigned char volume );
/* callback for MidiListener */
void noteOff( unsigned char note );

SoftwareSerial mySerial(10,11);
MidiListener midiListener(mySerial, noteOn, noteOff);

/* Arduino-required function */
void setup()
{
  Serial.begin(9600);
  mySerial.begin(MIDI_BAUDRATE);
}

/* Arduino-required function */
void loop()
{
  midiListener.poll();
}

/* Callback when MIDI_NOTE_ON occurs */
void noteOn( unsigned char note, unsigned char volume ) { 
  Serial.print("note on ");
  Serial.println((int) note);
}

/* Callback when MIDI_NOTE_OFF occurs */
void noteOff( unsigned char note ) {
  Serial.print("note off ");
  Serial.println((int) note);
}