First working version :

- pots
 - keyboard
 - octave selction

res/tools/hairless-midiserial/ardumidi/examples/ardumidi_test/ardumidi_test.pde

@@ -0,0 +1,80 @@
+/*
+  This file is public domain. Use it as you like.
+*/
+
+#include <ardumidi.h>
+
+int ledPin = 13;
+int note_on = 0;
+
+void setup()
+{
+  Serial.begin(115200);
+  pinMode(ledPin, OUTPUT);
+}
+
+void loop()
+{
+  
+  if (!note_on)
+  {
+	// play a Cminor chord on channel 0, at maximum volume (127)
+    midi_note_on(0, MIDI_C, 127);
+    midi_note_on(0, MIDI_E + MIDI_FLAT + MIDI_OCTAVE, 127);
+    midi_note_on(0, MIDI_G + MIDI_OCTAVE, 127);
+
+	// The MIDI_* macros were created to make your life easier, but you
+	// don't have to use them. You may enter numbers instead if you know
+	// what you're doing.
+
+    note_on = 1;
+    digitalWrite(ledPin, HIGH);
+  }
+
+  else
+  {
+	// stop the Cminor chord
+    midi_note_off(0, MIDI_C, 127);
+    midi_note_off(0, MIDI_E + MIDI_FLAT + MIDI_OCTAVE, 127);
+    midi_note_off(0, MIDI_G + MIDI_OCTAVE, 127);
+
+    note_on = 0;
+    digitalWrite(ledPin, LOW);
+  }
+  
+  delay(500);
+}
+
+// Available commands:
+//
+// Start/stop playing a certain note:
+//   midi_note_on(byte channel, byte key, byte velocity);
+//   midi_note_off(byte channel, byte key, byte velocity);
+//
+// Change pressure of specific keys:
+//   midi_key_pressure(byte channel, byte key, byte value);
+//
+// Change controller value (used for knobs, etc):
+//   midi_controller_change(byte channel, byte controller, byte value);
+//
+// Change "program" (change the instrument):
+//   midi_program_change(byte channel, byte program);
+//
+// Change key pressure of entire channels:
+//   midi_channel_pressure(byte channel, byte value);
+//
+// Change pitch-bend wheel:
+//   midi_pitch_bend(byte channel, int value);
+//
+// Send a comment:
+//   midi_comment(char* str);
+//
+// Send a series of bytes (to be interpreted by another program):
+//   midi_printbytes(char* bytes, int len);
+//
+// Parameters:
+//   channel             an integer from 0 to 15
+//   pitch-bend value    an integer from 0 to 16383
+//   all other values    an integer from 0 to 127
+//
+

res/tools/hairless-midiserial/ardumidi/examples/ardumidi_test_all_instruments/ardumidi_test_all_instruments.pde

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+/*
+  This file is public domain. Use it as you like.
+*/
+
+#include <ardumidi.h>
+
+int ledPin = 13;
+int note_on = 0;
+int voice = 0;
+
+void setup()
+{
+  Serial.begin(115200);
+  pinMode(ledPin, OUTPUT);
+}
+
+void loop()
+{
+  
+  if (!note_on)
+  {
+	// play a Cminor chord on channel 0, at maximum volume (127)
+    midi_note_on(0, MIDI_C, 127);
+    midi_note_on(0, MIDI_E + MIDI_FLAT + MIDI_OCTAVE, 127);
+    midi_note_on(0, MIDI_G + MIDI_OCTAVE, 127);
+
+	// The MIDI_* macros were created to make your life easier, but you
+	// don't have to use them. You may enter numbers instead if you know
+	// what you're doing.
+
+    note_on = 1;
+    digitalWrite(ledPin, HIGH);
+  }
+
+  else
+  {
+	// stop the Cminor chord
+    midi_note_off(0, MIDI_C, 127);
+    midi_note_off(0, MIDI_E + MIDI_FLAT + MIDI_OCTAVE, 127);
+    midi_note_off(0, MIDI_G + MIDI_OCTAVE, 127);
+
+    // go to next instrument
+    voice++;
+    if (voice > 255) voice = 0;
+    midi_program_change(0, voice);
+
+    note_on = 0;
+    digitalWrite(ledPin, LOW);
+  }
+  
+  delay(500);
+}
+
+// Available commands:
+//
+// Start/stop playing a certain note:
+//   midi_note_on(byte channel, byte key, byte velocity);
+//   midi_note_off(byte channel, byte key, byte velocity);
+//
+// Change pressure of specific keys:
+//   midi_key_pressure(byte channel, byte key, byte value);
+//
+// Change controller value (used for knobs, etc):
+//   midi_controller_change(byte channel, byte controller, byte value);
+//
+// Change "program" (change the instrument):
+//   midi_program_change(byte channel, byte program);
+//
+// Change key pressure of entire channels:
+//   midi_channel_pressure(byte channel, byte value);
+//
+// Change pitch-bend wheel:
+//   midi_pitch_bend(byte channel, int value);
+//
+// Send a comment:
+//   midi_comment(char* str);
+//
+// Send a series of bytes (to be interpreted by another program):
+//   midi_printbytes(char* bytes, int len);
+//
+// Parameters:
+//   channel             an integer from 0 to 15
+//   pitch-bend value    an integer from 0 to 16383
+//   all other values    an integer from 0 to 127
+//
+

res/tools/hairless-midiserial/ardumidi/examples/from_alsa_to_arduino/from_alsa_to_arduino.pde

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+/*
+  This file is public domain. Use it as you like.
+  
+  This is an example program to showcase reading  with 
+  Arduino the MIDI output from an ALSA sequencer. This simply
+  toggles the Arduino LED whenever a MIDI "note on" or "note off"
+  event takes place.
+*/
+
+#include <ardumidi.h>
+
+void setup()
+{
+  Serial.begin(115200);
+  pinMode(ledPin, OUTPUT);
+}
+
+int counter = 0;
+
+void loop()
+{
+	while (midi_message_available() > 0) {
+
+		MidiMessage m = read_midi_message();
+
+		if (m.command == MIDI_NOTE_ON) {
+			/* 
+			If you want to find out which key was pressed, check
+			the value of m.param1
+			*/
+			digitalWrite(ledPin, HIGH);
+	    } 
+
+		else if (m.command == MIDI_NOTE_OFF) {
+			digitalWrite(ledPin, LOW);
+		}
+
+	}
+}