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From: Joe Legris
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020830
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Subject: Re: Electronic Parking Spot Finder
Date: Thu, 19 Dec 2002 16:39:36 -0500
NNTP-Posting-Date: Thu, 19 Dec 2002 16:39:08 EST
Organization: Bell Sympatico
> I live in urban Boston and parking is notoriously bad around here.
> I'm considering building an electonic project to help with this and
> would love any feedback. My idea is that around here street spaces
> are the best thing to have because you are not blocked in as you are
> if you park in the single lane driveway that comes with my house. I
> want to build a detector that I can turn on when I park in the
> driveway and it will "watch" the street to see if any spaces open up
> and then let me know with some alarm or flashing light or whatever.
> My idea for the electronics is this:
> If I had an array of 6-12" long .5" diameter black plastic tubes that
> contained a photodiode. I would use the tubes to "aim" the sensors at
> each parking space I want to monitor. I would have one tube acting as
> a base level control to account for changes in ambient light. I would
> compare the signal from each sensor with the baseline and tune it to
> react so that the reflected wavelength off the cars would trip the
> alert when a car left a monitored spot. What do you guys think?
> Thanks for any input
They used to do this with video security systems. Aim a video camera at
the scene and place photocells on the monitor at the appropriate spots.
If you low-pass filter the outputs (which will buzz at 60Hz), a change
at that part of the scene will register as a voltage fluctuation that
you can detect with an appropriate circuit.
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