Midi Drum Sequencer
My analogue style MIDI step sequencer.
![](data:image/svg+xml;charset=utf-8,<svg height="683" width="1024" xmlns="http://www.w3.org/2000/svg" version="1.1"/>)
It has 48 switches to control 6 drums over 8 beats, a tempo control, LED indicator and start/stop switch all connected to an Arduino Nano.
As the nano has 22 I/O pins, I used a keyboard matrix to connect the 48 toggle switches to 14 pins. This post at the bald engineer was invaluable.
The diodes ares 1N4148, the box was from the The Works. The source code and more circuit details are on github