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HowTo: Light Control Basics
( Mike Robinson)
Step 3 : Control Methods – Simple 8/12 Channel
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| | This is the cheapest and easiest of the computer controlled methods. This system requires a computer/laptop with a parallel port, some relays, and some extension cords or outlets. Using software you can set up a light show and it will turn the data pins of the parallel port on/off. That will cause the relays to switch which will then turn the light channels on/off. The parallel port only has 8 data pins (although it’s possible to address a few more pins for 12 channels) This means that if you want to switch 36 channels, you need 3 parallel ports in your computer. This is usually easily accomplished by installing add-in cards. Although 36 channels doesn’t sound like very much, with proper sequencing you can create a very effective display. Remember that a channel doesn’t have to be a single strand of lights and you could easily run 30 strands of lights per channel if you have 10 amp relays. That would be 108,000 lights/360 amps!
Pros – Simple, cheap, effective. You can be up and running in a matter of days and no soldering is required.
Cons – Limited number of channels. Not expandable past 3 parallel ports/36 channels.
Cost Breakdown: You will need an SSR (Solid State Relay) for each channel. These run $2-$10 each. You will also want a box to enclose the relays, a parallel cable to cut up, some wire, and either extension cords or outlets/boxes.
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