Category Archives: Projects

Music Box Thingy: a rotary sequencer v1.0


This post is about a fourth semester project that our group did. The project was featured in Roskilde 2010 Festival. I was responsible for electronics part of the product.

Everything started form an idea…

Decision was made to create something that would make it easier for people to “break the ice”. There were several iterations of the product till Music Box was born. We decided on creating a rotary sequencer. There were two versions that were used for real-world testing.

Implementation… v1.0

First test was done in a club called Culture Box.  This is where the first iteration of the Music Box v1.0 was used. It has a really simple design. Activation of the steps is done by some push-buttons with levers. Levers move and push a button when a can is inserted into a hole.

There are 32 holes in total (four instruments with 8 steps in each). This means that input from 32 buttons had to be gathered. We decided on using multiplexers this way expanding possible input count on Arduino.

There were four of these boards because each has 8 inputs that are sent through 1 channel (in normal words it is 8:1 mux).

For indicating which step the sequencer was on we used LED’s that went from the inside of the circle to the outer most hole.

LED’s are controlled by Arduino via serial-in-parallel-out shift register.


Now some photos from the Culture Box…

And this is me deeply thinking about how well it works 🙂


Do not forget to watch in High Quality...

Exam presentation video

Stress testing Music Box

Inserting LED’s

Pitch for RedBull

More photos can be found on my facebook page:

To be continued…

This is first part of the Music Box description. Second part (Roskilde Version) is coming soon.