Re: Room occupancy detection and door opening/closing - 1-wire or wireless solution?

["Karam Karam" <kzkaram@xxxxxxxxxxx>]

Room occupancy (as opposed to just motion) can be worked out to
reasonable degress of accuracy if you have adequately placed sensors
and some suitable logic/heuristics - see www.idratek.com

Karam
IDRATEK LTD

--- In ukha_d@xxxxxxx, "dermot_bradley" <bradley@...>
wrote:
>
> Hi folks
>
> I'm trying to figure out the easiest way to detect room occupancy
and
> doors being opened/closed from a PC.
>
> I already have 4-core telephone cable round around various rooms and
> I'm in the process of soldering 1-wire temperature sensors to this
so
> it would make sense to use this if possible.
>
> One easy way to wire up magnetic door sensors seems to be to use a
EDS
> D2PC "low cost 2 channel digital I/O 1-wire card" (as sold
by
> Homechip) to connect the magnetic sensors to the 1-wire network.
>
> As for PIR sensors, I've not yet found a easy way to use them with
> 1-wire, mainly due to the requirement for power for the PIRs.
>
> I guess I could use a battery powered PIR and wire the contacts to a
> D2PC for 1-wire connection.
>
> Alternatively I could buy some Visonic wireless PIRs and their
> Powercode receiver to convert the PIR wireless signals to seperate
dry
> contacts and then connect these to D2PC and on to the 1-wire
network.
>
> Has anyone on the list tried this sort of thing before? Anyone have
> comments or alternative suggestions?
>
> Basically I'm intended to use the PIRs and door contacts so that a
> program on my homeserver PC can control lights and appliances (i.e.
> turn on room lights after X minutes of no movement).
>
> I haven't decided what to use for light and appliance control yet
> either (that's a whole other isseu) but will probably go with
Homeeasy
> or Domia.
>



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