made midi channel a #defined const

control_change/control_change.pde

@@ -47,6 +47,7 @@
 #define THRESHOLD 5   // Hysterisis threshold
 #define CONTROLLER 11 // Choose a Controller ID - 
                       // http://www.somascape.org/midi/tech/spec.html#ctrlnums
+#define CHANNEL 1     // MIDI Channel
 
 SparkSoftLCD lcd = SparkSoftLCD(LCD_PIN); // Serial LCD
 unsigned long intervalTimer;  // mark interval time
@@ -63,7 +64,7 @@ void setup() {
   lcd.print("Waiting...");
 
   // MIDI Setup
-  MIDI.begin(1);
+  MIDI.begin(CHANNEL);
 
   // Other I/O Setup
   pinMode(BUTTON_PIN, INPUT);
@@ -93,9 +94,9 @@ void loop() {
       lcd.print(value);
 
       // Send the MIDI Control Change Message
-      MIDI.sendControlChange(CONTROLLER, value, 1);
+      MIDI.sendControlChange(CONTROLLER, value, CHANNEL);
 
-      // OR - Send the MIDI pitch bend message on channel 1
+      // OR - Send the MIDI pitch bend message
       // define value above as: unsigned int value
       // value = pot * 16;  // Map to pitch bend value 0-16383
       // MIDI.sendPitchBend(pitch, 1);

play_notes/play_notes.pde

@@ -41,6 +41,7 @@
 #define BUTTON_PIN 2  // Pushbutton
 #define LCD_PIN 4     // Serial LCD RX line
 #define POT_PIN A0    // Potentiometer wiper
+#define CHANNEL 1     // MIDI Channel
 
 SparkSoftLCD lcd = SparkSoftLCD(LCD_PIN); // Serial LCD
 bool btnPressed;      // is button depressed?
@@ -59,7 +60,7 @@ void setup() {
   lcd.print("Waiting...");
 
   // MIDI Setup
-  MIDI.begin(1);
+  MIDI.begin(CHANNEL);
 
   // Other I/O Setup
   pinMode(BUTTON_PIN, INPUT);
@@ -102,7 +103,7 @@ void loop() {
     lcd.print(note);
     // Play the MIDI note.  Consider expanding this by adding another
     // potentiometer for attack / release velocity.
-    MIDI.sendNoteOn(note, 64, 1);
+    MIDI.sendNoteOn(note, 64, CHANNEL);
     notePlayed = true;
   }
 
@@ -117,7 +118,7 @@ void loop() {
     lcd.print("Note Off: ");
     lcd.print(note);
     // Send the Note Off message to stop playing the note. 
-    MIDI.sendNoteOff(note, 0, 1);
+    MIDI.sendNoteOff(note, 0, CHANNEL);
     notePlayed = false;
   }
 }

read_notes/read_notes.pde

@@ -38,6 +38,7 @@
 #include <MIDI.h> // download from http://sourceforge.net/projects/arduinomidilib
 
 #define LCD_PIN 4     // Serial LCD RX line
+#define CHANNEL 1     // MIDI Channel
 
 SparkSoftLCD lcd = SparkSoftLCD(LCD_PIN);
 
@@ -50,11 +51,11 @@ void setup() {
   lcd.print("Waiting...");
 
   // MIDI Setup
-  MIDI.begin(1);
+  MIDI.begin(CHANNEL);
 }
 
 void loop() {
-  if (MIDI.read()) {
+  if (MIDI.read(CHANNEL)) {   // Channel arg is optional
     switch(MIDI.getType()) {
       case NoteOn:
         {
@@ -83,6 +84,11 @@ void loop() {
           break;
         }
     }
+
+    // We need this so that the MIDI OUT will parrot the data on MIDI IN
+    // without errors.  See the comment about this in the Control Change
+    // demo code.
+    MIDI.send(InvalidType, 0, 0, 0);
   }
 
 }