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 03:31:43 GMT
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Viewed:
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1439 times
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Terry King wrote:
>
> Wes, relays would work pretty well.
>
> (Still, how much current do your motors draw???) The
> LEGO motors draw about .35 Amps (350 Milliamperes)
I am using the motors that came with the RCX.
> 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.
Hmmm - do you propose to ensure the delay in the relay circuit or
programmatically? If in the circuit, how?
> 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.
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Message has 1 Reply:
 | | Re: RCX motor voltage
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| The simple thing would be to do the short delay in the software. Identical relays usually 'make' faster than they 'break' due to energy stored in the magnetic circuit. It's hard to do this without active components. If you use a typical small (...) (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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| 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 (...) (25 years ago, 9-Nov-99, to lugnet.robotics.rcx)
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