This page is dedicated to all of the leaders of Scouting organizations who contribute their time and effort so that boys and girls can have the opportunity to learn and grow while having fun.
This page and its associated pages were created so that we, the designers of this timer, could share our design with others. It is our hope that our efforts will help you to foster good sportsmanship in children, through friendly and fair competition. While it is true that many methods exist to fairly judge simple racing events, we believe that a timer with automatic start and finish detection provides a certain level objectivity and accuracy not found in other methods.
The plans presented here are intended for the typical electronics hobbyist. It is assumed that the reader is familiar with the basic priciples of electronics, has some experience with simple soldering techniques, and is able to read and interpret a schematic diagram of a moderately complex electronic circuit.
Although the race timer circuit described in these documents has been tested under a variety of conditions, it is impossible to predict and test under all possible circumstances to which the circuit may be subjected. Furthermore, many performance aspects are directly linked to the physical layout of the components and the method of connection and enclosure. Therefore these plans are provided as-is, without any type of warranty whatsoever, including warranties of personal safety or fitness for any particular application. You assume all risks and liabilities incurred from the construction, use, attempted use, or inability to use the circuit described in these documents.
In other words... You built it, not us!
This hypertext document, together with the related hypertext and image documents describing the construction and use of an electronic race timing device, are the property of their Author, Kristin Hammond. The Author reserves all rights with regard to these documents, and grants to You certain permissions as described below.
The Author hereby grants You permission to make and distribute copies of these documents under the following conditions:
The Author hereby grants You permission to produce and distribute Derivative Works based on these documents under the following conditions:
The race timer circuit described here was originally designed, tested, and developed in 1997 by a group of Electrical Engineering students working on a volunteer basis in their free time. The goal was to build a stand-alone race timer for a local Cub Scout Pack to use in its annual Pinewood Derby. The timer worked so well that the design team decided to share the circuit design with other groups. The plans for a two-lane timer were first published on the World Wide Web in 1998. Since that time, the designers have received requests for three-, four-, and six-lane timer circuit designs. In 2001, the schematic diagrams and supporting documents were updated to reflect some minor design changes and to make the schematics more readable.
The following individuals and groups have been instrumental in the
development and maintenance of this race timer design.
Copyright © 2001 Kristin Hammond
Send comments and requests for technical assistance to PineTimer@aol.com
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