Subject:
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Re: A RCX 'Beacon'
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 29 Jul 1999 15:07:31 GMT
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Viewed:
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471 times
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In lugnet.robotics, lego-robotics@crynwr.com (Cwikla, Brian) writes:
> Well, I'm not an expert when it comes to small electronics and making them,
> so I thought I would post this question to this list.
>
> After working with the RCX for nearly a year now, I've found a tool/sensor
> that I would really like to have, but no idea how I could implement it.
>
> Basically, it works like this. It would involve a home-brew sensor and a
> home-brew module. The sensor would attach to the input port on the RCX.
> The module can be placed anywhere and emits a pulse/beep/signal. The sensor
> on the RCX can pick up that pulse/beep/signal and be able to tell the
> general direction it is coming from. It would send a number from 0 - 360 to
> the RCX to tell it in degrees what direction it is coming from and then
> through programming in the RCX, it could adjust it's direction to go towards
> that signal.
>
> I know there could be factors like signal bouncing off of walls and giving
> wrong impressions as to direction to the RCX and such.... but is something
> like this possible? Or is there currently any method that someone is using
> to always navigate to a certain point/area? Any help would be appreciated!
Brian, I share your dream. It's a great idea.
Surprisingly enough just this morning I wrote an email to Al Thiele asking for
the same thing. I'm obsessed by the problem of knowing the robot position. I
had some success experimenting odometry, but I still need a way to zero the
errors from time to time with an external reference point. I was wondering if
a sort of radio beacon like the ones the planes use would be possible. One (or
more) dedicated radio frequency (or IR) emitters, and one (or more)
directional receiver to put on your robot and connect to the RCX.
I'd love to get values in the 0-360 range that tells the direction. But I
could live with other simpler solutions too: the receiver returns a value
that's higher when it is pointed toward the emitter (so I can place it on a
rotating turret and detect the radio/IR beacon direction). With three beacons
you could implement a true GPS-like navigation system.
It would be a dream!
I hope Dennis, Al or the other guys that have "electronic fingers" can help...
:-)
Mario
http://www.geocities.com/~marioferrari
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Message is in Reply To:
 | | A RCX 'Beacon'
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| Well, I'm not an expert when it comes to small electronics and making them, so I thought I would post this question to this list. After working with the RCX for nearly a year now, I've found a tool/sensor that I would really like to have, but no (...) (25 years ago, 29-Jul-99, to lugnet.robotics)
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