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Bemix is a music system which plays user selected music in the bathrooms of Slugfest. Residents can control the music from a web interface and from touch switches located in the bathrooms.


Bemix version 3.0 (current version) has five touch switches embedded in the wall of the bathroom, arranged in a + configuration. The user may start and stop the music, increase and decrease the volume, and navigate through a playlist using the touch switches. Using a web interface, one may assemble playlists as well as view and control the state of the speakers in each bathroom.

Bemix 3.0 hardware and software is made to be easily modified, expanded, and adapted to other projects. The 4E Network was developed as part of Bemix but is applicable to any project requiring a connection to a computer or another project. The bemix software can handle input from any user interface with only a small amount of work.





If you are interested in contributing, please contact the bemix developers mailing list (bemixdev).


Version 1

Bemix version 1.0 was created in Spring 2005. It was designed to play music in the Bemis bathroom through speakers located above the drop ceiling. Users would select music through Glirnath, a web interface.

Later, a touch switch was added to provide on/off control from the bathroom. The touch-switch was hidden in a towel rack in the Bemis bathroom. When someone touched the towel rack and the faucet at the same time, the op-amp senses the change in voltage, compares it to a referece voltage, and amplifies it. This signal is sent to a flip flop which toggles power to the speakers.

The success of Bemix led slugs to plan its expansion into other bathrooms. But, the v1.0 hardware and software had much room for technical improvement. The touch switch was finiky and there was no way to override the touch switch from the computer.

Version 2

Bemix version 2.0 was planned but not implemented (by the time the cable trays were up, version 3 was nearly completed). It would have simply built on v1.0, expanding it to the three central bathrooms and making it more robust.

Version 3

Version 3.0 is a complete redesign of version 2. It will be PIC based and will communicate with the computer over the 4E Network. This will allow a virtually unlimited number of commands to be exchanged between the bathrooms and server. The user interface in the bathroom consists of five touch switches in a + configuration.

Cable Trays

All low voltage wiring Bemix must be run in a cable trays, because messy wires start fires. Our cable trays are from Reuse and currently being installed.

See Also