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Run the power from the batteries to the brown lead on the sensor, then connect the blue lead to the negative terminal on the battery, and also run a lead from the negative terminal of the battery to the ground pin on the Isaac 16 digital input (so you have 2 leads going to the negative terminal of the battery). This is important because the robot controller uses the ground pin to detect whether anything is connected on the input. Finally, attach the white or black lead (only one) to the input pin of the digital input, test these to see which one you want. (I think white is normally-on, black is normally-off). That should allow you to power the sensor externally but still have it operating as a digital switch for the robot.
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