posted by [identity profile] dfn-doe.livejournal.com at 12:53am on 2005-06-15
Depending on how fast your target is moving a simple scanning back and forth combined with a comparator should give you okay accuracy...
 
posted by [identity profile] dglenn.livejournal.com at 06:17am on 2005-06-15
Oh! [slaps forehead] The ones moving at or exceeding the speed limit will be gone too quickly to bother with (though the loudest of those still garners a grimace); the ones I want to hit will be moving <15 MPH, and most of them will stop. (There's a traffic light four houses away.)

That sounds like a design I could diagram at the black-box level after reading the data sheets on a few components ... but would need someone with respectable EE-fu to translate into an actual circuit diagram with capacitors and resistors and their values on it. ("Respectable" levels of EEness in this context means basically "any". I've got this funny disconnect between the abstract concepts and the concrete implementations that I really must educate away one of these years. But given a schematic and a box of parts, I can (clumsily, fugly-ly) solder things together according to the map.)

This device is sounding more simple the more I think about it... Thanks for the Clue.

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