Subject:
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Re: RCX motor voltage
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 9 Nov 1999 03:17:39 GMT
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Reply-To:
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tking@together.net%stopspam%
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Viewed:
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1395 times
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Wes, relays would work pretty well.
(Still, how much current do your motors draw???) The
LEGO motors draw about .35 Amps (350 Milliamperes)
You could connect two 5V coil relays , each with a diode in series with
the coil, connected oppositely to each other. The nominal 7 volts
or so from the RCX, minus about .7V across the diode would be
pretty close. "Forward" would operate one relay, "Reverse"
would operate the other, and Off or Float would turn BOTH
relays off. THe relays would need to have two poles. You
need to make SURE that a relay has time to drop out, before
activating the other, or you'll short out your battery supply.
Waiting 1/10 of a second should be plenty.
This is (sort of) like connecting two back-to-back LED's
to an output, and lighting up one or the other with
Forward/Reverse.
--
Regards,
Terry King ...In The Woods In Vermont
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Message has 1 Reply:
 | | Re: RCX motor voltage
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| (...) I am using the motors that came with the RCX. (...) Hmmm - do you propose to ensure the delay in the relay circuit or programmatically? If in the circuit, how? (...) (25 years ago, 9-Nov-99, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: RCX motor voltage
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| (...) These solutions bring up problems of their own: using a motor to operate a switch (battery box or Lego switch) requires monitoring the switch state to determine on/off status. Also, there will be a time delay while the motor moves from one (...) (25 years ago, 8-Nov-99, to lugnet.robotics.rcx)
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