Peter Todd wrote:
> On Sun, Aug 27, 2006 at 04:35:58PM -0400, David VanHorn wrote:
>   
>>> There's an idea for you Peter, take a traditional clock and replace the
>>> motor with a stepper. Have it work normally keeping time but
>>> periodically "go nuts" backwards, fast forward etc, then correct itself
>>> and behave for a random period.That might sell..
>>> :)   D
>>>       
>> A PIR detector could be used to detect when you were really in front of it
>> "watching" so as to prevent the behaviour during those times, but allow it
>> to go nuts when nobody's all that close to it.
>>     
>
> That's a pretty cool idea! Actually a friend of mine made an art peice
> using a similar concept, she built various types of playground
> equipment, see-saw, swing and one of those merry-go-round things, and
> all made them activate and move while you were busy reading her artists
> statement. They stopped the second you moved away to look at the work.
>
> In practice of course, standing near the work, but looking away, still
> kept the PIR sensor going... So...
>
> How would you go about detecting the someone's gaze?
>
> Personally I'd rig up a digital camera, with "eye-detecting" software,
> but surely there are better ways...
>
>   
The problem is that most very sensitive PIR detectors/algorithms work 
when the warm object is MOVING.
You might need to design your own (all of mine were quite sensitive 
(40m), but required the target to move
every few seconds or so.


--Bob

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