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Any way to get 5v output to drive a relay
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toolaa:
I am using a 25" Sony TV in the cab and so far I am very happy with the results.
Chris:
Parallel port's probably your best bet... should be a ton of articles around triggering a switch through the parallel port...

Start at http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm .

--Chris

toolaa:
Thanks, this looks like it will work.  Great site by the way, lots of cool stuff that I'm sure I'll need next year when my son has to do a science fair project.

fiscap:
Also check out - http://www.epanorama.net/circuits/rspower.html

Be very careful interfacing any type of home-brew electronics with your computer - you might cause some irreparable damage to the port or even your motherboard. I would suggest using some sort of solid-state driver circuit to trigger the relay since connecting the coil directly to your PC could potentially create a situation of abnormally high current draw or inductive loading. The triggering of the coil would also create noise on the circuit which might have adverse affects on your serial/parallel ports.
rdagger:
They make relay PCI cards that do exactly what you want.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=11182&item=5785905634&rd=1&ssPageName=WDVW
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