Hi Dirk, Dirk Jagdmann wrote: >> The idea would be to modify my application (Jackbeat) to control light in >> addition to sound, using dmx4linux (see: >> http://llg.cubic.org/dmx4linux) and a >> supported DMX controller. > > Should be very easy, as it's essentially just an 8 bit value for each > "lamp" you'd like to control which directly drives the lamps intensity. Just read http://llg.cubic.org/dmx4linux/coding.html, and some stuff at http://www.dmx512-online.com Say I plan lighting for a specific club : is it like each lamp, effect, motor will be assigned a to given channel ? I'd then ask the club's technician : "what channel is this lamp assigned to ?" (or he'd give me specification) For example : 4 lamps, on channels 1,2,11 and 12 I would then have to configure my app to issue something similar to : dmx_t buffer[4] = {0x80, 0xFF, 0x80, 0xFF}; fd = open (DMXdev(&argc, argv), O_WRONLY); lseek (fd, 0, SEEK_SET); write (fd, buffer, 2 * sizeof (dmx_t)); lseek (fd, 10 SEEK_SET); write (fd, buffer, 2 * sizeof (dmx_t)); That would set two lamps to half brightness, and the other two lamps to full brightness... Is this right ? >> I just checked this 55 EUR Enttec USB controller : >> http://www.enttec.com/opendmxusb.php >> This firm seems to officially support Linux. Looks great... > > I would suggest this one. It's cheap, supported and plug'n'play. > A Linux 2.6.x version of dmx4linux will be out in the next weeks. All of this sounds great. But how stable is dmx4linux ? Already used it on real live shows ? (I'm not talking about big/huge shows) [The following is quoted from your previous answer in this thread] > You should expect that lighting equipment should be DMX controlled today. So > this technically solves to connecting your DMX controller (from laptop) to the > DMX cable of the lighting console at the location. However be prepared that they > might have more than 1 DMX universe/cable due to the local installation so to > use all lights you'll need more than 1 universe on your DMX interface. Or two > interfaces with 1 universe each. That's the reason why you should contact a > local technican beforehand. Got it. If DMX is a such common standard, I can safely be dependent on it. I'll forget about the few DMX-unfriendly places I find. And if I really want to play in some of these non-equiped place, I'll try and rent dimmers and lamps. For a second universe, is it simply a matter of plugging a second Enttec device and accessing channels 513-1024 ? > If they don't own a DMX controlled lighting evironment I won't make myself any > trouble trying to connect to "their" lighting equipment with my own dimmers, > unless you're prepared to spent several days ripping their whole installation > apart (which they probably would not allow anyway). Okay, let's forget about that. All I need is a DMX controller and the club's equipment spec. Thanks a lot ! -- og
