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A project log for DrumKid: aleatoric drum machine

A lo-fi digital drum machine which uses randomness to create unpredictable beats. Runs on Arduino, with audio provided by the Mozzi library.

Matt BradshawMatt Bradshaw 09/30/2019 at 13:430 Comments

Here is a selection of photos showing the inside of the current version of DrumKid.

This is what DrumKid looks like after soldering but before assembly
This is view after removing DrumKid's rear panel - note the Arduino/ATmega328 breakout pins to allow users to modify the instrument. Also note the unpopulated spaces for capacitors - these were included in the PCB layout in case they were needed for decoupling, but only one smaller capacitor (C4) ended up being necessary - these spare footprints will be eliminated from the next PCB
The front laser-cut panel covers the soldered leads of the components. You can also see evidence of the modification I had to make due on this prototype due to an error in the schematic (this will be fixed in the next version)
The battery box is mounted using two countersunk machine screws, which are secured on the other side with dome nut
And here's how it's all assembled

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