Date: Tue, 06 Nov 2007 11:42:31 +0000 From: Christopher Key <cjk32@cam.ac.uk> To: Achilleas Mantzios <achill@matrix.gatewaynet.com> Cc: freebsd-hardware@freebsd.org Subject: Re: Implementing a "normally open" relay Message-ID: <47305327.7050205@cam.ac.uk> In-Reply-To: <200711021411.02488.achill@matrix.gatewaynet.com> References: <200711021411.02488.achill@matrix.gatewaynet.com>
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Achilleas Mantzios wrote: > Hi, > i am building a home security system based on zoneminder under FreeBSD 6.2. > I think i have it all sorted out, except a way to drive an external alarm upon > camera motion. > > > Have two states: > > a) (normal) Have the two wires isolated from eachother, ground, voltage > b) (alarm) Connect the wires together (shortcircuiting the EOL). > > Could it be done someway with /dev/cuad* /dev/lpt* > > > Probably overkill, but you can buy general purpose relay boards driven from the parallel port, e.g., http://www.electronic-kits-and-projects.com/3074.htm Chris
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