ArduinoSoundSynthesizer

Designed for the Arduino UNO.

All button pins are active LOW.

Options:

• PIN : Output pin (default: 2)
• PIN_RECORD : Record button pin (default: 11)
• PIN_SUB : Subtract button pin (default: 12)
• PIN_ADD : Add button pin (default: 13)
• PINS : Keyboard button pins (default: 3 - 10)

Additional Options:

• frequencies : Stores the absolute Hertz frequencies of the notes. Values higher than 2000 Hz may not play accurately.
• frequencyMultiplier : Multiplies the frequencies by this value in Hz.
• frequencyOffset : Offset the frequencies by this value in Hz.
• dutyCycle : Ratio of output being high to output being low.
• interval : Minimum amount of time between playing notes.
  • Minimum is about 0.01 for higher notes to play correctly.
  • General formula for whether a note would play correctly: 2 * frequency / interval < clockSpeed

Build Instructions:

1. Connect PIN to speaker output.
2. Connect PINS to each keyboard key.
3. Connect PIN 11 - 13 to extra buttons at the top.

Operating Instructions:

• PIN_RECORD (11) is the toggle button to record songs.
• Press both PIN_ADD (13) and PIN_SUB (12) at the same time to play songs. (default plays 8 notes in order)
• EEPROM saving is automatic when you let go record.
• Hold both PIN_SUB (12) and PIN_RECORD (11) at the same time for three seconds to clear the EEPROM.

Serial Commands:

• Basic Commands:
  • play : Plays current song in memory
  • playrec : Alias for play
  • stop : Stops playing any song
  • stoprec : Alias for stop
• Toggle Commands:
  • printoff : Stops printing every note played to serial
  • printon : Begins printing every note played to serial
  • romoff : Stops automatic saving to rom
  • romon : Begins automatic saving to rom
• EEPROM Commands:
  • saverom : Saves song in memory to the EEPROM
  • printrom : Prints the contents of the EEPROM to serial
  • clear : Clears the contents of the EEPROM
  • clearrom : Alias for clear
• Recording Commands:
  • beginrec : Begins recording to memory
  • rec : Alias for beginrec
  • record : Alias for beginrec
  • endrec : Stops recording to memory