Re: Re: Sensors for doors & windows & ...

[Chris Hunter <cjhunter@xxxxxxxxxxxx>]

headlines from :

http://www.maxbotix.com/

2.5V to 5.5V operation
Low noise chaining
Superior beam shape
Stable range reading
No central blind spot
...
Detect objects 0-in. to 254-in. (6.45-meters)
Range objects 6-in. to 254-in. (6.45 meters)
...
Reports range directly
Serial (0-Vcc) Out
Analog Voltage Out
Pulse Width Out
42KHz ultrasonic ping
Free run operation or triggered operation

Chris



On 29 Oct 2007, at 00:02, Karam Karam wrote:

> I'm pretty sure the Maxbotix sensors have analogue output variants -
> so you could interface 4 at a time into IDRANet via the QAI (4x
> analogue input) modules. What are you trying to achieve overall?
>
> Karam
> IDRATEK LTD
>
>
> --- In ukha_d@xxxxxxx, Chris Hunter <cjhunter@...> wrote:
>>
>> Gerry's boards ... presumably as in :
>>
>> http://www.rgbled.org/maxbotix/index.html
>>
>> up to twelve sensors per board sounds pretty useful !
>>
>> our PC has four RS232 sockets, one maybe two being spare ... so
> could
>> be good for us, too (assuming I can link to Cortex) ... !
>>
>>
>> Chris
>>
>>
>> On 27 Oct 2007, at 12:23, Kevin Hawkins wrote:
>>
>>> I'm intending using some of the Maxbotix ultrasonic sensors
> pointing
>>> slightly diagonally across the doorways.  These then provide a
>>> direction
>>> indication for a person moving into or out of a room  (short
to
>>> long or
>>> long to short reading) and based on distance you can elimate
> outside
>>> false trips.  I use Gerrys boards, only played so far but
seems
>>> viable,
>>> fortunately I have deep doorways in walls often 3 foot thick.
.
> A
>>> top
>>> mount sensor might even identify people based on height- or
the
> dog .
>>>
>>> I also have some Pulsor -strain sensors arriving any day now -
> which I
>>> hope to use on the stairs and a couple of doorways.
>>>
>>>      K
>>>
>>> Chris Hunter wrote:
>>>>
>>>>
>>>> 'thinking of sensors for doors & windows ... and the
limitations
> of
>>>> the reed-switch (just open or closed & no certainty on
what it's
>>>> telling about the door, unless perhaps it's attached to
the
> locking
>>>> mechanism in some way - which can't see how to do as a
retro-
> fit) ...
>>>> was trying to think how else ... strain-gauge ... laser +
> mirror ...
>>>> all have just-as-bad limitations ... hmmm ...
>>>>
>>>> 'wonder if PIRs are all the same ... obviously not, but in
the
> sense
>>>> of being designed to pick-up just movement .... are there
some
> that
>>>> are designed to pick-up position, say, or presence not
associated
>>>> with movement, or movement of hard but not soft objects,
or ... ?
>>>>
>>>> with MHVR, having doors or windows open might be expected
to
> affect
>>>> the pressure in the house ... so, all closed => some
> pressurisation,
>>>> maybe, depending on the relative speeds of the inlet &
outlet
>>>> fans ... 'wonder if adding air-pressure-sensor(s) to each
room
> could
>>>> be useful ... picking-up both level & fluctuations ...
and so
> doors
>>>> open, people moving-about, curtains wafting, pesky flies,
>>>> whatever ...
>>>>
>>>> micro-phones are air-pressure sensors, of course ...
wonder if a
>>>> broad or limited bandwidth one would be best ...
>>>>
>>>> hmmm ... would fuzzy logic be the thing, to make it work
...
> looked-
>>>> up Wiki, but 'am really none the wiser, 'though it did
mention
>>>> pattern recognition as being an application for it ...
>>>>
>>>> rambling, sorry, but I feel there's a glimmer here !
>>>>
>>>> or maybe I'm clutching at straws ...
>>>>
>>>> Chris
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>
>
>
>
>
>



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