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Well, at the time, I didn't know about the Tomy Bit Lap Counter, so I built my own using a laser pointer and a laptop PC. Since then, I've learned of the Tomy unit, but with the PC you get a lot more power and flexability. For instance, because the PC has memory, you can store different car setups, testing sessions, fastest laps, practice results, race results, average lap speed, and so on. The home built unit also covers a lane anywhere from 1 inch to pretty much a mile in width.
As for transponders, they need batteries, which means weight, and there isn't much room in a bit for xtra anything, let alone a transponder. The smallest one's I've seen are about the size of a Bit anyway. I wish it were different as our problems would be solved.
Finally, building my own was fun, I've never done anything like that before.
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