Re: HA Holy Grail #1: Occupancy Detection

["Frank Mc Alinden" <frankmc@xxxxxxxxxxxxxxxx>]

Hi Andy

> That sounds great!  So the PIC does the timers?

Yeah the pic generates the  5 minute timer.....This meant that Homevision
didnt have to constantly poll the sensor as its output trigger pulse is
only
around 1 second....

Just read the specs on the pirs i have and they use open collector output
whereas the maplin ones have a positve trigger....other than that they are
phyisically the same dimensions....

Frank


----- Original Message -----
From: "Andy Laurence" <andy@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, August 22, 2006 8:40 PM
Subject: RE: [ukha_d] HA Holy Grail #1: Occupancy Detection


> From: Frank Mc Alinden [mailto:frankmc@xxxxxxx]
>> I use my standard alarm pirs to trigger  my cbus lighting via
relays when
>> required....In the loungeroom i have a small sensitive pir
connected to
>> my
>> probe system via a black box which has a pic controller....If any
>> movement
>> detected it triggers/retriggers a 5 minute timer ...Homevision
polls the
>> pir
>> probe every 5 minutes and decrements a counter if the probe is off
...so
>> after 15 minutes if no movement detected it turns the lounge
lights
>> off...I
>> also added an ir receiver to the black box so if ir was received
it would
>> also retrigger the 5 minute timer.....works quite well......
>
> That sounds great!  So the PIC does the timers?  I think the xAP
NetIOM
> has a couple of timers.  I may be able to utilise them somehow. 
Either
> way, I will document it, and post it when I'm done.
>
> Cheers,
> Andy
>
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