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86 Appendix E: Using the I/O lines and controlled- current output of Matrox GatorEye
Connecting to a lighting controller
You can control an illuminator with a lighting controller that is connected to any
auxiliary output line of your Matrox GatorEye. For example, you can control a
LED lighting device (such as a ring LED) that is connected to a lighting controller.
❖ Note, to connect a LED lighting device directly to your Matrox GatorEye, see the
Powering and controlling a LED lighting device with controlled-current output
section, later in this appendix.
Your Matrox GatorEye can generate a standard strobe signal to control a lighting
controller. You can route the strobe signal on any auxiliary output line. Connect
the output line (for example, Line5) directly to the lighting controller's trigger
input. Connect the ground of the lighting controller and the ground of your
Matrox GatorEye to a common ground. In this connection, you also need an
additional voltage source, and depending on the voltage source, either a pull-up
resistor or a voltage divider between your camera and the lighting controller.
• If the voltage source outputs the amount of voltage expected by the lighting
controller, you need to add an external pull-up resistor. The external resistor pulls
the voltage up to the external power supply's voltage (+V
Matrox GatorEye
digital I/O and
power connector
1. Note that the output can sink up to 100 mA.
2. Note that +V
Note that you must choose an appropriate resistance value for the pull-up
❖
resistor based on the voltage (V) and current (I) that your lighting controller
expects for its illuminator trigger input. Also, you should choose a resistor rated
2
+V
ext
External
pull-up
resistor
1
Line5
Trigger input
GND
GND
Lighting
controller
cannot exceed 24 V.
ext
).
ext
+V
Illuminator
+
+
-
-
o
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