Subject:
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Tachocount
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 11 Nov 1998 18:16:29 GMT
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Viewed:
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2540 times
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According to the Technical Reference, Tachocount counts the number of
revolutions of the motor shafts (of the two built-in Cybermaster motors
ONLY).
I fiddled a liitle with it, but it doesn't seem too useful, first of all
because the internal motors are only practical to use for wheels, and second
because the tachocounter doensn't distinguish direction. So you can only use
it as a feedback input while the motor is driven by the program, so you know
the direction. I used such a feedback loop to make my Crusher walk a little
straighter (it heavily curves when both motors are at full power - by
tachocounting one wheel stops for a moment if the other one has done less
rotations.)
Thinking of/working at some kind of 'stepper motor' apllication.
Eric Brok
Visit LEGO ON MY MIND:
http://www.svc.fcj.hvu.nl/brok/legomind
Mindstorms/Mind Control section:
http://www.svc.fcj.hvu.nl/brok/legomind/robo
Dutch section:
http://www.svc.fcj.hvu.nl/brok/legomind/nl
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Message has 3 Replies:
 | | Re: Tachocount
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| At least there's one thing that CyberMaster proved - That 3 inputs is not the limit of the H8 or even all the LEGO PBricks. Clearly CyberMaster have 5 inputs, although 2 of them are fixed just like the 2 fixed motors (which is not as bad as it (...) (26 years ago, 11-Nov-98, to lugnet.robotics)
| | | Re: Tachocount
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| (...) I'm sure the motors may be used for other things as well, albeit not as easily as separate motors. (...) But in a program you will always know which way the motors drive, right? So one can possibly maintain a second variable for each motor (...) (26 years ago, 12-Nov-98, to lugnet.robotics)
| | | Re: Tachocount
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| Do you think a tachometer needs to distinguish direction? Why? Going forward or not, a vehicle _moves_ from one place to the other, so the space moved must always be added, never subtracted. How could you otherwise figure _how_much_distance_ you (...) (26 years ago, 12-Nov-98, to lugnet.robotics)
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