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NNTP-Posting-Date: Sun, 24 Nov 2002 04:12:10 -0600
From: Barry Lennox
Subject: Re: Detecting moment when a fast moving object passes over a line
Date: Sun, 24 Nov 2002 23:13:01 +1300
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On Sat, 23 Nov 2002 14:42:29 -0500, "Richard Sim"
>Hi, I'm working on a project currently that's for automatic lap scoring in
>radio controlled car races, where the cars may be travelling in excess of
>40-50 MPH at the point where they cross over the start/finish line, and
>several cars may pass over the line within close proximity of eachother.
>The cars will have "transponders" in them, which detect when they cross over
>the start/finish line, and send a signal to a reciever/decoder that's
>connected to a PC.
>I'm having trouble finding a way to implement the start/finish line
>reliably; the biggest problems are that the transponder may be anything up
>to 15cm (6")
Maybe an electrostatic field? Could you use an insulated cable like
car ignition cable above the track carrying several Kv from a suitable
low-energy source. A "patch antenna" on the roof of each car could
feed a simple detector.
Or could you tolerate a probe sticking up 12-18 inches of each car? It
could contact an bare overhead cable carrying perhaps 1-2 Kv again
from a low-energy source.
Or would the whole thing be too much for the health and safety
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