GPX Pro Manual42
© 2009 XT Racing
A typical linear potentiometer has 3 wires -- positive voltage, ground, and the output signal.
Depending on the extension of the slider, the output signal's voltage will vary continuously
between the positive voltage and ground.
For the GPX, the positive voltage should be connected to a voltage between +3V and +5V. A
convenient source of +3V is the RED WIRE OF CABLE "B".
Basic calibration of the potentiometer involves measuring the voltage when it is fully
compressed, measuring the voltage when it is fully extended, and specifying how many
millimeters of travel the slider moved from the fully compressed to the fully expanded position.
You may perform this calibration either before it is mounted to the vehicle, or after it has been
mounted.
If you calibrate it before it is mounted, you will be measuring the full travel of the device. That is
OK, but it does not tell you what the limits of travel are when it is mounted on the vehicle. It may
not be possible to fully extend and compress the potentiometer when it is vehicle-mounted.
Make sure you choose a potentiometer that has more travel than can occur when it is mounted.
Otherwise, the vehicle may compress or extend it beyond its physical limits and will probably
destroy it.
There is an optional calibration setting, called sag, which you may calibrate if you wish. This
calibration point represents the "at rest" (neutral) position of the slider. This is always done after
it is mounted on the vehicle, and should be calibrated with the rider/driver in position in the
vehicle. When the sag is calibrated, GPStudio can indicate when the suspension travel is
compressed or expanded, and how much, relative to this neutral position.
1.7.3.8 Switch Input
A switch input may be connected to any of the analog channels. It is an input which only can be
"on" or "off".
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