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Arduino 4 Task (MIDI and Basic Audio)

MIDI via Arduino

Physical Set-up. Note the 220 ohm resistor: it is very important a 220 ohm resistor is used, any other value will not work.

/*
MIDI
Language: Wiring/Arduino

Plays MIDI notes from 30 to 90 (F#-0 to F#-5)

*/

char note = 0;    // The MIDI note to be played

void setup()  {
    // Set MIDI baud rate
    Serial.begin(31250);
}

void loop()  {
  // play notes from  30 to 90 (F#-0 to F#-5):
  for (note = 0; note < 127; note ++)  {
    // Note on channel 1 (0x90), some note value (note), middle velocity (0x45):
    noteOn(0x90, note, 0X70);
    delay(10);
    // Note on channel 1 (0x90), some note value (note), silent velocity (0x00):
    noteOn(0x90, note, 0x00);
    delay(100);
  }
}

// Plays a MIDI note.  Doesn't check to see that
// cmd is greater than 127, or that data values are less than 127:

void noteOn(char cmd, char data1, char data2)  {
  Serial.print(cmd, BYTE);
  Serial.print(data1, BYTE);
  Serial.print(data2, BYTE);
}

Another example

/*
MIDI2
Language: Wiring/Arduino

Plays MIDI notes from 30 to 90 (F#-0 to F#-5)

*/

char note = 0;    // The MIDI note to be played
char rnote = 0;  // Random Note

void setup()  {
    // Set MIDI baud rate
    Serial.begin(31250);
}

void loop()  {
  randomSeed(analogRead(0));
  // play notes from  30 to 90 (F#-0 to F#-5):
  for (note = 0; note < 127; note ++)  {
    // Note on channel 1 (0x90), some note value (note), middle velocity (0x45):
    noteOn(0x90, note, 0X70);
    delay(200);
    // Note on channel 1 (0x90), some note value (note), silent velocity (0x00):
    noteOn(0x90, note, 0x00);
    delay(10);
    //
    // Now the random number!
    // return a random number from 50 - 300
    // randNumber = random(50,300);
    rnote = random(0,127);
    noteOn(0x90, rnote, 0X70);
    delay(100);
    noteOn(0x90, rnote, 0X00);
    delay(10);
  }
}

// Plays a MIDI note.  Doesn't check to see that
// cmd is greater than 127, or that data values are less than 127:

void noteOn(char cmd, char data1, char data2)  {
  Serial.print(cmd, BYTE);
  Serial.print(data1, BYTE);
  Serial.print(data2, BYTE);
}

Basic Audio Using a Piezo Disc

Have a look here.

Just in case, here's the latest version of the Arduino to Max Patch

To cover:

This is just a way of communicating via MIDI with another device, through the Arduino...
That
and the other. 

This also has ramifications concerning:

Life, the universe and anything...

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The Projects

The projects and tasks are designed to help you through the various courses and materials that you'll have to deal with, and also to provide an active and practical element to what could otherwise become a rather dry and technical exercise. Tasks are small exercises - you may be asked to complete one or two per week. Projects are larger and carry a higher percentage of the mark. We will undertake two, three, four or more projects and tasks. The final project is usually an individual choice project, and will be worth significantly more than the others in terms of percentages in your portfolio. We will usually try to set aside a time to perform the projects in a public setting.