Re: Cheap and small Break Beam circuit ?

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

Hi Ian

> As always Frank you spot the most interesting products ;-)

Spotted this over in Cocoontech...Got a couple myself... started on a pic
interface but will wait for Gerrys  version ...They are a great little and
i
mean little device......In my pic setup i have the serial line of the
Maxbotic gated and it shared the rs232 tx line with the pic but Gerry is
going to decode the data from all Maxbotic devices and pass on the info to
the device connected to the serial interface......Some guys on Coocoon want
to use it as a parking device / movement sensor .....

Frank


----- Original Message -----
From: <ian.bird@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, July 13, 2006 7:35 PM
Subject: Re: [ukha_d] Cheap and small Break Beam circuit ?


> As always Frank you spot the most interesting products ;-)
>
> I may have to get some to play with as they may be the answer to the
> perennial PIR problem. In my case in my kitchen where PIR's don't work
> very well due to hanging washing, temperature fluctuations and an L
shape.
>
> Ian
>
>
>
>
>
>
>
> "Frank Mc Alinden" <frankmc@xxxxxxx>
> Sent by: ukha_d@xxxxxxx
> 12/07/2006 20:26
> Please respond to ukha_d
>
>
>        To:     <ukha_d@xxxxxxx>
>        cc:     (bcc: Ian Bird/CV/Novartis)
>        Subject:        Re: [ukha_d] Cheap and small Break Beam circuit
?
>
>
> Hi Marcus
>
> If the break beams involve  having the tx and rx on opposite sides of
the
> door then maybe consider this little ultrasonic device........not as
cheap
>
> as a beam break but  onlt required on side of the door plus a serial
> interface.......
> http://www.maxbotix.com/
>
> Gerry Duprey is currently developing a pic micro interface which will
> handle
> up to 12 of these and will do an xPL Plugin for it...........Im going
to
> use
> 2 of these to monitor my pond water level and also a water tank (when
i
> get
> one)..
> HTH
> Frank
>
>
> ----- Original Message -----
> From: "Marcus Warrington" <marcus.warrington@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Wednesday, July 12, 2006 11:37 PM
> Subject: [ukha_d] Cheap and small Break Beam circuit ?
>
>
>> 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
>>
>>
>>
>>
>> Yahoo! Groups Links
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>>
>>
>>
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