For a plug and play solution, see this
thread.
Minimally, you need a USB-DMX interface to convert the signal from the PC, some DMX cabling and some devices to control.
If you're stateside, there are
cheaper options with an element of DIY.
In Layman's terms: DMX is a theatrical standard for controlling lights, and other theatrical electrics. However, as DMX does not have error checking, it is
never used for anything that is life-critical or potentially dangerous. (e.g. pyrotechnics or automated rigging)
A DMX installation consists of a controller device, cables and controlled devices (e.g. dimmers, intelligent lights, foggers, hazers, lasers, etc). Most professional, permanent DMX installations use 5-pin DMX. The DJ market uses a combination of 3-pin and 5-pin DMX. Holiday lighting hobbyists tend to use 3-pin. Artemis uses exclusively three-pin DMX.
While most professional DMX installations use
dedicated hardware controllers, Artemis outputs the DMX signal via a PC's USB port - much more practical for this kind of application. You will need a
USB-DMX converter to convert the signal to one that is DMX-compatible.
You will then need a cable from this converter to your controlled devices. For Artemis, as mentioned earlier, you will want one of the three-pin variety. If your run lengths are not great, you can use XLR microphone cables, or rig up your own DMX-over-ethernet scheme. You just need a quality cable with three conductors and some way of connecting it to your equipment.
A DMX signal can control up to 512 unique addresses (channels), where each device has its own address. Each device can pass the signal to the next, allowing you to connect the devices in series, without running each one back to the centralized controller, or having to worry about device order/location. You could also give multiple devices the same address, meaning they would perform the same commands as each other, reducing complexity at the cost of flexibility.
Your devices will typically have some way to set their address, often with
dip switches or programmable controllers. For
RGB lights, you will need three addresses (channels), one each for the Red, Green and Blue elements.
The holiday lighting market has designed/contrived some more consumer-friendly implementations of DMX (using ethernet cables instead of DMX cables), but some of it is overkill even for Artemis, which has very simple requirements. For example, holiday lighting hobbyists require very precise time syncing between audio beats and DMX cues. Artemis is a much more forgiving environment as the synchronization is not required to be as precise, and therefore is not as apparent.
[Last edited Jan 23, 2013 00:36:49]