I am interested to build a bike but I would also like to have free software/hardware. How can I build a cyclometer with open-source software? Would it be possible to find reflashable hardware or open schematics?
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The most detailed account/details I've come across for building your own bike computer is here on PIClist.
Those pages contain detailed instructions for building a bike computer using a PIC microcontroller linked to a Hall Effect Sensor (it detects the magnet attached to a spoke as the wheel spins). In addition to the build details it also features a detailed discussion of the design process which the creator undertook whilst creating the computer.