Subject:
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Re: parallel RCX outputs
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 22 Jul 2006 09:11:24 GMT
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Viewed:
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10409 times
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Hi Chris,
Chris Magno <cmagno@rogers.com> writes:
> Can I put an electric 2x4 plate across output port A and B
> to increase the current I can draw from the brick?
I think so (warning, this is based only on theoretical knowledge).
> 1. when I ran a few tests with a 1x2 lamp, I would get interesting results.
>
> A and B forward - ON
> A and B Reverse - ON
That should be ok.
Setting the power level might not work correctly,
from looking at the ROM code it seems the PWM waveforms
are not synchronized.
Now comes the "Trying to Kill an RCX" section.
> A Forward B off - very DIM
> B Forward A off - very DIM
You are using one motor output to short the other one.
> A Forward B Reverse - FLASHing ON
> B Forward B Reverse - FLASHing ON
The outputs are fighting each other.
The flashing is an interesting phenomenon, I would guess
a thermal protection circuit triggers intermittently.
Jürgen
--
Jürgen Stuber <juergen@jstuber.net>
http://www.jstuber.net/
gnupg key fingerprint = 2767 CA3C 5680 58BA 9A91 23D9 BED6 9A7A AF9E 68B4
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Message has 2 Replies:
 | | Re: parallel RCX outputs
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| (...) If all motor ports are started and stopped together, does that synchronise the PWM waveforms? If not, then I don't recommend paralleling up. If so, then I recommend paralleling up only when motors are started and stopped together and are run (...) (18 years ago, 23-Jul-06, to lugnet.robotics.rcx)
| | | Re: parallel RCX outputs
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| (...) The flashing is a feature of the 1x2 and 1x4 lamps... if run in one direction, it's solid, but in the other it flashes. This comes from the old light and sound sets, where you might well want a flashing light. You're right that the two outputs (...) (18 years ago, 23-Jul-06, to lugnet.robotics.rcx)
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Message is in Reply To:
| | parallel RCX outputs
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| Can I put an electric 2x4 plate across output port A and B to increase the current I can draw from the brick? Chris 1. when I ran a few tests with a 1x2 lamp, I would get interesting results. A and B forward - ON A and B Reverse - ON A Forward B (...) (18 years ago, 21-Jul-06, to lugnet.robotics.rcx)
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