Subject:
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Re: Design Question - For a newbie
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 30 Dec 1999 03:08:49 GMT
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Reply-To:
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wattsup1@earthlink.netSTOPSPAM
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Viewed:
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820 times
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One way to have the Scout drive and shoot would be to use one motor to drive
forward and turn in reverse, then use the second motor to fire the "bullet".
The R2D2 of the DDK uses this drive forward - turn in reverse with the one motor
that the micro-scout has. It could also be done with a differential and a
ratchet on one wheel. The ratchet would allow both wheels to move forward, but
would only let one turn in reverse. Then setting a timing loop for an
"about-face" should work
Good Luck on your project.
Jeff Buckey wrote:
> I have an idea for a robot, but I'm not sure how to get it to work with the
> minimal resources that come in the Robotics Discovery Set. Sorry if these
> questions seem trivial, I'm new to this list and to Lego Robotics.
>
> I would like to make a bot that will drive straight forward (maybe in a
> pattern like a circle), and upon running into something will fire off a
> projectile (using the small "gun" and rubber tipped "bullet" that comes with
> the RDS) then turn and flee.
>
> I have an IR tower that I bought from Pitsco/Datac last week, so I can write
> the assembly code (using the ScoutSDK and ScoutTool for Windows) to control
> the robot, my problem is that I only have 2 motors. I've built the bug bot
> that the RDS has instructions for which uses both motors to control the
> wheels (one for the left and one for the right), and I was thinking of using
> that design to build the "body" of the robot. But then I can't figure out
> how to "fire" the gun. I planned on setting a motor running when a touch
> event occurred which would "push" the trigger of the firing mechanism
> launching the projectile.
>
> OK, on to the question, has anyone built a simple robot to do something like
> this? How did you overcome the obstacle of only having 2 motors? I
> understand that the RIS and RCX have 3 outputs and can control 3
> simultaneous motors, but unfortunately I don't have that luxury. How can I
> use just one motor to drive the bot, and make it turn, so I can use the
> second motor to launch the projectile?
>
> Any help is greatly appreciated.
> -Jeff Buckey
>
> "I sense much NT in you. NT leads to bluescreen, bluescreen leads to
> downtime, downtime leads to suffering. NT is the path to the darkside.
> Powerful Unix is." - Unknown Unix Jedi.
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Message has 1 Reply:
 | | Re: Design Question - For a newbie
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| (...) (URL) shows how to build this assembly, which was what I was going to suggest. It only works if your droid is a three-wheeler, with this wheel as the nose wheel, but is very effective at maximizing the DDK's single motor. It's possible to do (...) (25 years ago, 29-Dec-99, to lugnet.robotics)
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Message is in Reply To:
| | Design Question - For a newbie
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| I have an idea for a robot, but I'm not sure how to get it to work with the minimal resources that come in the Robotics Discovery Set. Sorry if these questions seem trivial, I'm new to this list and to Lego Robotics. I would like to make a bot that (...) (25 years ago, 30-Dec-99, to lugnet.robotics)
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