Subject:
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Re: Wireless Robots
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 21 Nov 1999 22:28:04 GMT
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Original-From:
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Pete Sevcik <(sevcik@)StopSpam(flash.net)>
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Viewed:
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783 times
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Matt,
I have built a lego robot controlled by a PC, using an IR link to communicate
commands. It used the same IR technology as Mindstorms, but had an
omni-directional IR link on the robot. The problem is link speed. For reliable
communication, you need an error recovery protocol on the link. I designed a
lightweight protocol, which worked well but added about 5 bytes of packet
overhead. At 1200 baud, it takes too long to get data to the PC, and get the
response back to the robot. e.g the sensor detects a wall, but by the time you
get that info to the PC, and get back a command to turn, you have already hit
the wall. IRDA technology is faster, but the distance is limited to 3 feet.
Radio links would be fine, but the low cost links are limited to about 1200
baud.
I was trying to do all the processing in the PC. The technique might work if
you found a way to split the work. Do tasks that require a quick reaction time
within the robot. Send the slower, more difficult tasks, back to the PC. If
you use a video camera, send the video data as analog, directly to the PC.
- pete.
Matt Ramadanovic wrote:
> Has anyone tried to use wireless networking to control a legorobot?
> IP programming in VB is easy and I was thinking of making a robot
> which uses the RCX as its medulla and a stripped down laptop with
> a PCMCIA Ethernet adapter as the cerebrum. The idea is to have a
> digital camera mounted on the thing sending back video along with
> passing instructions to the RCX (most of the bandwidth would be unused
> if it was just sending instructions). The command console would sit on
> a regular PC and would host an app that talks to the "brain" of the robot.
> I don't have my kit yet so I have not tried programming a brick - though
> have
> seen the .ocx. I was thinking of creating functions in assembly and
> compiling
> a .dll in Delphi that VB programs could make calls to add functionality. Has
> anybody tried this approach yet? Once I get the hardware, anyone want to
> collaborate on a .dll?
>
> Matt
--
Pete Sevcik sevcik@flash.net
Techno-stuff Robotics
http://www.flash.net/~sevcik/
Robotics for FUN !
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Message has 2 Replies:
 | | Re: Wireless Robots
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| Hi Pete, I have been reading about AI concepts a lot lately (and my partner here at work has his doctorate in AI), so I have some thoughts about your comments below: (...) time you (...) hit (...) [snip] (...) if (...) The current path in robotics (...) (25 years ago, 22-Nov-99, to lugnet.robotics)
| | | Re: Wireless Robots
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| (...) reliable (...) you (...) Would you consider making the RIS perform the check or just sending a verbatim copy of what it gets to the sender (two way radio) and making the PC check that the information was sent OK. I know that a bad packet from (...) (25 years ago, 22-Nov-99, to lugnet.robotics)
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Message is in Reply To:
| | Wireless Robots
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| Has anyone tried to use wireless networking to control a legorobot? IP programming in VB is easy and I was thinking of making a robot which uses the RCX as its medulla and a stripped down laptop with a PCMCIA Ethernet adapter as the cerebrum. The (...) (25 years ago, 20-Nov-99, to lugnet.robotics)
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