Testing Tool for Board written.

main/libraries/MIDI/examples/MIDI_Callbacks/MIDI_Callbacks.ino

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+#include <MIDI.h>
+
+MIDI_CREATE_DEFAULT_INSTANCE();
+
+// -----------------------------------------------------------------------------
+
+// This function will be automatically called when a NoteOn is received.
+// It must be a void-returning function with the correct parameters,
+// see documentation here:
+// http://arduinomidilib.fortyseveneffects.com/a00022.html
+
+void handleNoteOn(byte channel, byte pitch, byte velocity)
+{
+    // Do whatever you want when a note is pressed.
+
+    // Try to keep your callbacks short (no delays ect)
+    // otherwise it would slow down the loop() and have a bad impact
+    // on real-time performance.
+}
+
+void handleNoteOff(byte channel, byte pitch, byte velocity)
+{
+    // Do something when the note is released.
+    // Note that NoteOn messages with 0 velocity are interpreted as NoteOffs.
+}
+
+// -----------------------------------------------------------------------------
+
+void setup()
+{
+    // Connect the handleNoteOn function to the library,
+    // so it is called upon reception of a NoteOn.
+    MIDI.setHandleNoteOn(handleNoteOn);  // Put only the name of the function
+
+    // Do the same for NoteOffs
+    MIDI.setHandleNoteOff(handleNoteOff);
+
+    // Initiate MIDI communications, listen to all channels
+    MIDI.begin(MIDI_CHANNEL_OMNI);
+}
+
+void loop()
+{
+    // Call MIDI.read the fastest you can for real-time performance.
+    MIDI.read();
+
+    // There is no need to check if there are messages incoming
+    // if they are bound to a Callback function.
+    // The attached method will be called automatically
+    // when the corresponding message has been received.
+}