Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!ncar!ames!pacbell!sactoh0!tree!mirandor
From: mirandor@tree.uucp (W. Le Roy Davis (1-23-90))
Newsgroups: sci.electronics
Subject: Circut needed
Summary: three event detector
Keywords: inexpensive
Message-ID: <1990Mar19.154615.22362@tree.uucp>
Date: 19 Mar 90 15:46:15 GMT
Reply-To: mirandor@.PacBell.COM (W. Le Roy Davis (1-23-90))
Organization: TREE BBS (916)332-4930 Sacramento, CA
Lines: 20

I am looking for the circut for a very inexpensive three event detector.
I work with the Boy Scouts, and they have this "pine box derby" involving small
(8" long) cars on tracks.  They run three at a time.  I need an easy to main-
tain circut that detects the cars crossing the finish line and determines 1st,
2nd, and 3rd place.  I would like to keep the circutry down to 74xx type chips.
I have had several friends suggest timed circuts, but that is getting too
complex.

E-mail responses would be appreciated as I don't regularly read this column.

                                                              Thanks,
                                                              Le Roy Davis

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