That's a cool setup. One thing I was wondering (which this answers) is if you had a supply for each wire, or you were multiplexing the one supply to multiple wires. It looks like you're running at least 4 strands at the same time: are you powering only a single strand, rapidly switching back and forth between adjacent strands, or can you drive {one,two,three} strands at the same time? (PS I like optotriacs more than TTL triacs: the latter seem to die a lot.) We designed an elwire driver chip once but it didn't go into production so I didn't get a chance to mess with it, alas.
If at some point you decide you want more channels and start running into clock limits I'd be glad to build/send a dedicated board with a fast, high I/O-line AVR chip. I wish dragondaud still used LJ: he used to teach classes in microcontroller/ELwire decorating.
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We designed an elwire driver chip once but it didn't go into production so I didn't get a chance to mess with it, alas.
If at some point you decide you want more channels and start running into clock limits I'd be glad to build/send a dedicated board with a fast, high I/O-line AVR chip. I wish