G-Scale Graphics Speed Trap Specification sheet

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Revision C: Updated 4/21/2021
Operation and Installation Manual
G-Scale Graphics
5860 Crooked Stick Dr.
Windsor, CO
70-581-3567
[e-mail]
Revision New: Updated 4/21/2021

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Overview
The Speed Trap uses two optical sensors placed under
the rails and between the ties of our 45mm track. The
sensor shines Infrared (IR) light up and receives the IR
light reflected back. When the train breaks the beams,
the time between the first and second beam is meas-
ured, converted to the scale speed of our choice, and
displa ed. Direction of travel and number of laps are
also shown.
Installation
Note: This device is NOT intended for permanent outdoor
installation, unprotected from the weather. However, the
sensor can easil be inserted under the track for use during
operating sessions, and then removed for proper storage in-
doors.
Insert the sensor under the rails and between the ties, as
shown in the photo. Make sure it is parallel to the ties and
perpendicular to the rails. Note: If readings don’t look realistic,
tr moving sensor off center of the rails, while keeping it per-
pendicular to the rails. You ma also have to reposition for
different equipment tripping the sensor.
Install a 9V batter b removing the snap-on cover. Carefull
insert a screwdriver or something to pr the cover awa from
the base. Attach the batter clip leads and then place the bat-
ter in the batter holder. Replace the cover.
Note: If operating with the cover removed, the red button on
the microcontroller can be used to reset the program, which
will also reset the lap counter.
Speed sensor. The camera sees the IR light (pink)
that we can’t see with the naked eye.

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Operation
The power “switch” is actuall a jumper on a header
connector. Remove the jumper from the left two posts
and place it on the right two posts to turn power ON.
A short momentar press of the button will change the
scale. A long button press will reset the lap counter.
If readings don’t look realistic, tr moving sensor off cen-
ter of the rails, while keeping it perpendicular to the rails.
You ma also have to reposition for different equipment
tripping the sensor.
Specifications
Mechanical
Size of Box: 3.0” X 3.2” X 1.7”H.
3D printed PETG enclosure with snap on cover.
Size of Displa : 1.0” X 0.6”
Wiring: Ribbon cable between speed sensor and
control box. Approximatel 7” long.
Size of Sensor: 2.8” X 1.3” X 0.6”. For use with large scale (45mm)
track.
Electrical
Power from internal 9V batter (not included)
Batter life: 4 hours rechargeable NiMH (200mah)
10 hours Alkaline (500mah)
Sensor optical IR reflective
Environmental
If using outdoors,
the control box
and sensor are
intended for tem-
porar use during
operating ses-
sions onl .
The Speed Trap
is not weather
proof and should
be stored in-
doors.