On 11/08/2012 02:18 PM, Tom Metro wrote: ... > wired to the parallel port (the server has one, and it is unused), and > controlled with some software, like parashell: > http://sourceforge.net/projects/parashell/ > > (More info on parallel port control here: > http://www.epanorama.net/circuits/parallel_output.html ) > > You can't get much simpler than a relay, DB25 connector, a 3.5mm jack > and plug, and some wire. The relays above even have an internal diode. > > (The other obvious choice is an optocoupler, but for the duty cycle this > will undergo I'm not that concerned, and the mechanical relay provides > the simplest interface to the emitter, where polarity, high-side vs. > low-side, and voltages are irrelevant, and thus more apt to work the > first try.) > > Anything simpler? Any skepticism for running the relay directly from the > port without a buffer? Any recommendations to use a serial port control > line instead?
If you go this route, I own the book Parallel Port Complete, and you can borrow it (http://www.lvr.com/parprtib.htm). It might be of some help. Personally I would use X10 for super simple and complete isolation from the computer, but I know there are a lot of folks here that don't trust X10. I still use it every day with much success. _______________________________________________ Hardwarehacking mailing list [email protected] http://lists.blu.org/mailman/listinfo/hardwarehacking
