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Racetrack Timer

for the fast guys

Racetrack Timer
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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
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