Vasile Surducan wrote: > On 8/29/06, Bob Axtell wrote: > >> 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), >> > > What if you have a thermal noise like a radiator in front of it ? > > but required the target to move > >> every few seconds or so. >> > > > Put a mechanical chopper in front of the PIR detector and the subject > can stay... > easy, isn't it ? > yep, that works. > greetings, > Vasile > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist