Midi code samples for chapter 12

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diff --git a/physical computing code fragments/p310midi-gpl3-library.ino b/physical computing code fragments/p310midi-gpl3-library.ino
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+++ b/physical computing code fragments/p310midi-gpl3-library.ino
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+/* Page 310 Advanced Methods -- Midi 
+
+Pseudocode:
+
+loop:
+    read sensor
+    convert sensor value to a note
+    play MIDI note
+    pause a quarter second
+    stop MIDI note
+end loop
+
+This sample uses the arduino midi library  midi data.
+
+*/
+
+#include <Midi.h>
+void setup() {
+  MIDI.begin(0);            	// input channel is set to 0
+}
+
+void loop() {
+  int value=analogRead(sensor);
+  note = map(value, 1, 750/65, 60, 71); 
+  MIDI.sendNoteOn(note,40,0); 
+  delay(250); // Wait for a bit
+  MIDI.sendNoteOff(note,0,0); 
+}
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diff --git a/physical computing code fragments/p310midi-no-library.ino b/physical computing code fragments/p310midi-no-library.ino
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+++ b/physical computing code fragments/p310midi-no-library.ino
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+/* Page 310 Advanced Methods -- Midi
+
+Pseudocode:
+
+loop:
+    read sensor
+    convert sensor value to a note
+    play MIDI note
+    pause a quarter second
+    stop MIDI note
+end loop
+
+This sample uses print statements to send midi data.
+
+*/
+
+int sensor = 2;
+void setup()
+{
+ // Set MIDI baud rate:
+ Serial.begin(31250);
+}
+
+void loop()
+ int value=analogRead(sensor);
+ int note = map(value, 1, 750/65, 60, 71);
+ Serial.write(0x90); //note on channel 1
+ Serial.write(note);
+ Serial.write(0x45); //velocity.
+ delay(250);
+ Serial.write(0x90); //note on channel 1
+ Serial.write(note);
+ Serial.write(0x00); //velocity=0->OFF.
+}
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