Date: Tue, 6 Nov 2007 16:03:52 +0300 From: Achilleas Mantzios <achill@matrix.gatewaynet.com> To: freebsd-hardware@freebsd.org Subject: Re: Implementing a "normally open" relay Message-ID: <200711061503.52706.achill@matrix.gatewaynet.com> In-Reply-To: <47305327.7050205@cam.ac.uk> References: <200711021411.02488.achill@matrix.gatewaynet.com> <47305327.7050205@cam.ac.uk>
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=D3=F4=E9=F2 =D4=F1=DF=F4=E7 06 =CD=EF=DD=EC=E2=F1=E9=EF=F2 2007 13:42, =E3= =F1=DC=F8=E1=F4=E5: > 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 Thank you Chris, thats probably a good solution for commercial/industrial applications. Bill (WKK) gave me an excellent idea about using a modem, and it works very good. > > Chris =2D-=20 Achilleas Mantzios
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