Re: Cheap and small Break Beam circuit ?

[Martin Howell <martin.howell@xxxxxxxxxxxx>]

Maplin do a Velleman kit for about 15 squid, got one in my post box.
The output is a simple on/off at around 9v - from memory, so it may not
be that - mine turns an LED on/off

Martin

Martin

Marcus Warrington wrote:
> Having now got all the lights (except the kitchen/Utility) on X10
> circuits I've now started to think about how to implement occupancy
> detection. Originally I was going to use ceiling mounted 360 degree
PIRs
> but having trailed them I find that they're sensitivity isn't up to
> detecting someone walk into a space in time to get the light on (not
> helped by the X10 comms latency). The only way I can get anywhere near
> is to mount them directly over the entranceway since they appear to be
> more sensitive directly underneath the sensor. So, next thought was to
> mount them centrally in the room but then use a break beam across the
> entranceway (door jam) as a primary trigger. So does anyone know a
small
> simple break beam device or circuit that I could install across a
> doorway. Needs to be small and sit relatively flush with the surface
> (the door jams are wood so I can rebate a little bit) and be easily
> connected to HomeVision.
>
> Marcus
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