[PSUBS-MAILIST] Compass Video

[Jon Wallace via Personal_Submersibles]

Alan, et al,
To support multiple external sensors, my current thinking is to pass a single DB25 printer cable through the hull and terminate it within an air-compensated distribution box outside the hull.  Currently I'm planning on having only three external sensors (compass, water temp, light detector) but want to have a quick way of adding or changing out sensors without worrying about more penetrations in the hull.  Depending upon signal output most sensors are going to require three to four wires each which would provide a capability of supporting 6 to 8 sensors with this configuration.  Adding a power supply within the distribution box would result in supporting 12-24 sensors.
I've thought about doing the same for 12vdc lighting or any other 12v requirement external to the hull.  Passing a single power cable to the distribution box and then using relays within that distribution box controlled by low voltage via the DB25 wiring.  It seems like this is a good approach for adding/changing external fixtures whether lighting, relays, etc.  I'm not sure there's a need for it though.  So some questions for my psubber brethren...
If you have a single light, do you ever wish you had more?
If you have multiple lights, do you run them all at the same time and do you ever wish you could control them separately, ie. just the ones port side, just the ones starboard?
Do you have lights to the side?  Rear?  If you control them independently, how?  Separate penetrators for each?
Jon
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