I know, BennyJo is going to be most upset I didn't call it SPOTsomething... Maybe I should call it JeeSPOT :o)
Anyway, I've built a similar device to BennyJo for wirelessly triggering, and controlling the power, of old camera flashes (like the Vivitar 283 and 285) with some Jeenodes, some optoisolators and a crash course in C programming!
Many thanks to JC for his patience, I know I asked far too many questions, but it now lives! It works! I will add some pictures of the TX unit with its 2x16 LCD display driven menu and config system when it looks a bit more presentable.
Maybe one day I will let someone else see my source code... Then again, maybe it's best I don't!
But here is the remote end being triggered to light its own picture. Staring Jeenode (V4), Jeelabs 3xAA battery holder and Jeeplug board with the optoisolators.