I have always hated the antenna flag timing systems but couldn't wait for the core system. So with a little help from the google I came up with the Hot Slot Racing
The site lists the wiring diagram for game port, serial port, or parallel port and the software is fine for my use. All told I spent about $40.00 (couldn't find cheap laser pointers handy)
2 laser pointers $15.99 ea
2 Infrared Phototransistors (radioshack pn# 276-145) $1.59 ea
1 25 pin male crimp-style d-sub connector $1.89
1 2 ft section of 4" PVC $3.98
1 ethernet cable (had an extra)
The reason the laser pointer were so expensive is I bought the larger variety that run on AAA instead of watch batteries. Otherwise I could have cut my cost in half
All told assembly took about 45 minutes. The latency project web site had a really good how to on this that is still available on the web somewhere. He did a much more advanced laser alignment than I did. I basically eyeballed it and then used shims to adjust. Seeing as how it was just kind of a quick implementation I only set it for 2 lanes. Given more time and more attention to detail a more elegant solution allowing more lanes would be possible. All in all though well worth the time and money.
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