Subject:
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Re: Newbie needs Help
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 6 Jun 2006 19:18:17 GMT
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Viewed:
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3642 times
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You only need one rotation sensor and some fancy gearing. Using a differential
in a way similar to the "South Facing Cart" or the stearing drive in a dual
differential setup, you could directly measure the amount of spin between a
driven wheel and an idler wheel (a wheel not attached to the motors that turns
when your robot moves forward or backward).
In this kind of configuration, the differential is stationary when the drive
wheels and idler wheel turn at the same speed in the same direction. When the
drive wheels slip, the differential will rotate. You could write your program
to lower motor power whenever the differential starts to turn (indicating that
wheel slip is occurring), and slowly raise the motor power while the
differential is stationary. Locking the wheels is never a good idea.
This may give your robot a big "OOOHHH" factor, but you will get a much bigger
return from playing around with the tow rope. If it is legal,try to design
something that raises your end of the tow rope above your oponent's end. Then
the act of pulling exerts a downward force on your robot and an upward force on
your opponent's.
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Message has 2 Replies:
 | | Re: Newbie needs Help
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| (...) Ummm.... that's not the way I remember the mechanics. There is a torque created that is force on the drawbar times the drawbar height from ground. That torque will lift your front end. Doubling your own drawbar height halves your pulling (...) (18 years ago, 6-Jun-06, to lugnet.robotics)
| | | Re: Newbie needs Help
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| (...) Dean, Thank you for your response. I am going to get on with the tow rope suggestion right away. You might like to know that your 2002 'Building Lego Robots for FLL' guide was the first thing that I read. Raj (18 years ago, 6-Jun-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Newbie needs Help
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| (...) Steve, One rotation sensor is allowed. There are also two light sensors, so your idea is definitely doable. The situations that are confusing are when the pull of the other robot prevents your robot from making any headway, as well as when (...) (18 years ago, 6-Jun-06, to lugnet.robotics)
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