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Unread 30-01-2011, 16:50
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Al Skierkiewicz Al Skierkiewicz is offline
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Re: How to control the minibot?

Patrick, It will do that if you remove power from the motor and short the leads of the motor. This is the technique that is in use when you select "brake" mode on a speed controller.
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Unread 30-01-2011, 17:21
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Re: How to control the minibot?

Quote:
Originally Posted by epic_wts View Post
Hi, I don't know if this would help, but you could probably use a deploy system, and then use a switch that would trigger once it touches the pole, causing the motors to activate and drive the minibot up the pole.
This is what our team is doing. all it is, is a limit switch from the kit last year, wired so that when we hit the pole, it sends a signal to the motor telling it to start.
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Unread 30-01-2011, 17:25
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Re: How to control the minibot?

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Originally Posted by pfreivald View Post
...to make it come back down nice and slowly under drive without a controller.
I don't think minibots are going to come down nice and easy. i would build one to with stand a fall from 122 inches. take a pole vaulters advice, hitting the ground will not be fun. ten-and-a-half feet, you would want a nice thick pad to fall on. build it so it can take the fall, and be ready to rewire if need be.
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Unread 31-01-2011, 00:01
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Re: How to control the minibot?

Quote:
Originally Posted by Al Skierkiewicz View Post
Patrick, It will do that if you remove power from the motor and short the leads of the motor. This is the technique that is in use when you select "brake" mode on a speed controller.
Of course, of course, and as a physics teacher I already know that... But it's only true if your MINIBOT back-drives down the pole in the first place -- which ours currently does not. Thus, shorting the motor leads will result in it continuing to not come down at all, instead of coming down slowly.

It's all good. Just more stuff for the kids to figure out!
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