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From Velosynth

Velosynth is an open-source bicycle interaction computer. It uses a variety of sensors to detect the Motion of a bicycle and then interprets this data into Audio and Visual communication. This feedback loop helps to increase awareness of the cyclist within the transportation environment — much to the same way one can both hear and see a vehicle approaching. Velosynth is designed for user modification and released under a Creative Commons non-commercial share-alike license. The project was initiated and is presently maintained by EFFALO.

Contents 1 Interfaces 2 Subsystems 3 Assembly 4 Patching 5 Resources

Interfaces

Velosynth communicates through a variety of Interfaces:

1. Audio — Sound generated from a synthesizer (output)
2. Visual — Diffused light from an LED (output)
3. Motion —Speed and acceleration (input)
4. Tactile — Physical switches and knobs (input)

Subsystems

Velosynth is composed of a number of complimentary subsytems:

1. Enclosure — the physical enclosure that holds the hardware components in place and attaches to the bicycle frame.
2. Software — the code that processes sensory input and emits audio/visual output (on github).

Assembly

Step-by-step building guides:

• Bill of Materials — A list of all the necessary parts and where to get them (thanks, thingiverse!)
• Getting started — a list of things to gather before you start
• Assembly - Jeenode — building and preparing the jeenode microcontroller
• Assembly - Enclosure — chassis and rigging subsystem, what contains all the parts
• Assembly - Module — preparation of a 170pin tiny breadboard module
• Assembly - Vactrol — assembly of a vactrol (LED + photoresistor) patch cable
• Assembly - Speedometer — sensor cable with hall effect sensor
• Assembly - Amplifier Module — LM386-based audio amplifier
• Assembly - Oscillator Module — schmitt-trigger based oscillator module
• Assembly - Controller Module — AD5206-based, six channel digital potentiometer

Patching

• Basic patch — single oscillator frequency and amplitude control

Resources

1. http://velosynth.com — information portal
2. http://velosynth.tumblr.com — design process documentation
3. http://vimeo.com/velosynth — video documentation
4. http://twitter.com/velosynth — announcements and status