Home › Magazines › 2005 › September › Racetrack Timer

Racetrack Timer

for the fast guys

Published in issue 346, September 2005

A model racetrack is a nice toy for boys. Even the ‘big’ boys like to race a little every once in a while. Of course, it is no longer considered ‘playing’, but ‘amateur racing’. If you then invite a friend for a match, the emotions can sometimes run high when it comes to deciding who crossed the finish line first. Here we present a circuit that can help you out in such situations.

Components

Free downloads

Relevant products

Resistors:

R1,R2,R6 = 22k

R3 = 2k2

R4,R5 = 1k

R7 = 18

Capacitors:

C1-C5 = 10µF 25V radial

C6,C7,C8,C11 = 100nF

C9,C10 = 22pF

Semiconductors:

D1,D2 = LED, low current, 3mm

D3,D4 = IR LED, e.g., TSUS5202

D5,D6 = IR PIN photodiode, e.g., BPW41

IC1 = AT89C2051-24PI, programmed, Publishers order code 040395-41

IC2 = MAX232

IC3 = TLC272

Miscellaneous:

K1 = 4-way SIL connector

K2 = 9-way angled sub-D socket, (female), PCB mount

X1 = 12MHz quartz crystal

PCB, ref. 040395-1 from The PCBShop

Project software, Publishers code 040395-81

Click below to download a PDF copy of this article from Elektor magazine.

	Downloads
	PDF Article (U050962.pdf)
	10 Elektor Credits
	PCB layout (040395-PCB.pdf)
	10 Elektor Credits
	Order from Elektor
	AT89C2051-24PI, programmed
	040395-41 (USD 11.10)
	PCB, bare
	040395-1
	Order from Eurocircuits
	PCB, bare
	Free downloads
	040395-11.zip Free download

Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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Racetrack Timer

for the fast guys

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Racetrack Timer

for the fast guys

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