Subject:
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Re: Soda-can challenge: beacons, tethers, etc. (was Re: Locating your position with the help of fixed be
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 3 Aug 1999 02:01:24 GMT
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Viewed:
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891 times
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In lugnet.robotics, Robert Munafo writes:
> If all you want to do is return to the "home base" for a project like the soda
> can challenge, all you need for a beacon is a simple blinking light (that
> blinks very fast). For example, just drive the axle of the polarity switch
> directly off a motor and run a light through the switch so the light blinks
> quickly. The quicker the better.
>
> Since the soda can challenge requires the robot to "enter [the] room", that
> means the beacon must be part of the robot. The robot would drop the beacon
> (that is, break into two pieces and leave part of itself behind) upon
> "entering the room". Fortunately the challenge says to "return to the
> starting point" and doesn't require "leaving the room in one piece".
>
> If the beacon blinks fast enough, your robot can scan for the beacon while
> it's rotating. Stop rotating when the pulse brightness (measured via the
> decayed average technique I described) is highest. Then move forward a bit,
> and scan again for mid-course correction.
How does the robot know if it has reached the destination, or if it has run
into the emitter even? By a sudden change in the direction of the beacon?
Cheers,
Hao-yang Wang
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