Arduino Step Sequencer

Hardware MIDI sequencer adapted from the Adafruit Mini UNTZtrument project. The case is 3D printed and based around a Seeeduino Lite. There are only 16 buttons so the controls are a bit creative using the shift button.

Features

• Sequence MIDI devices
• Change tempo with Rate Knob
• Change time division with Knob 2
• Sync with USB for start/stop and tempo
• Send Play over MIDI for external devices
• Variable Sequence Length
• Change octaves
• Accidentals using Shift Button
• Performance Mode
• Gate length on Knob 3
• Add switch for internal/USB/external sync
• Sync tempo from MIDI

(Desired)

• Sequence multiple devices simultaneously
• Store at least the last sequence
• Tap Tempo
• Remove Last Step
• Edit Step
• Swing on Knob 4

Button Layout

+------------+
|(t)(l)(g)(S)| <-- Knobs
+------------+
|[p][r][T][s]| <-- Buttons
|[d][u][b][n]|
|[1][2][3][4]|
|[5][6][7][8]|
+------------+

Legend

t - Rate

l - Time Division

g - Gate

S - Swing

k - Undefined knob

p - Play/Pause Sequence

r - Record

T - Rest (Tap Tempo)

s - (Shift)

d - Octave down (Toggle sync mode)

u - Octave up

b - Prev Page (Reduce Sequence)

n - Next Page (Extend Sequence)

1-8 - Steps/Keys (MIDI Channel?)

Workflow

Record Sequence:

[ Press Record ] -> [ Press Key Button to Add Step] -> [ Press Record to Stop ]

Sequence buttons light up to show sequence progress.

Play Sequence:

[ Press Play ] -> [ Sequence Plays ] -> [ Press Play ] -> [ Sequence Stops ]

Each step lights as it plays. Play light stays on while sequence is playing.

Performance Mode

[ No Sequence Playing ] -> [ Press Key ] -> [ Transmit Note ]