Subject:
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input used as output
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 7 Dec 2004 21:34:00 GMT
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Original-From:
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dan miller <DANBMIL99@nospamYAHOO.COM>
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Viewed:
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770 times
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ok, sans any response --
Using NQC, I can turn on & off the LED on my light sensor (changing sensor type between LIGHT and
NONE). If I attach a motor to the input, it turns at a low power level (a bit less than power=1)
if the sensor type is LIGHT. When I switch to NONE, the motor stops turning. I can attach two
inputs to the motor and get a bit more power. I cannot reverse the motor, or brake it.
So I'm suspecting that if I get into LegOS internals, I can tweak the low-level code to do more.
What I can't seem to find is any information on the actual electronics of the RCX itself.
Specifically, what resistors/amplifiers/diodes etc. connect the I/O pins of the 68xx controller to
the 3 inputs?
Please, someone must know something!
--- dan miller <danbmil99@yahoo.com> wrote:
> ok this is a funky idea, but I've already got some evidence it can work.
>
> I *really* need 4 outputs, but I only need 2 inputs for my project. Is there some way, using
> brickOS (I assume it's impossible without modifying firmware), to reprogram an input as some
> sort
> of output? Obviously there's some capability to provide a voltage to the light & rotation
> sensors. In fact, if I hook up a motor to a sensor, and enable light sensor on that input, it
> moves a bit!
>
> I'm thinking if I can modify the duty cycle that drives the LED, I can at least get a
> one-directional output from a sensor input. I'm wondering where I can get more data on exactly
> how the I/O pins are wired up to the RCX, how to hack the kernel to do whatever is possible, and
> what risks I might be taking with this approach?
>
> thx
>
>
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Message has 1 Reply:
 | | Re: input used as output
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| (...) No, that's an internal limitation of RCX inputs: when configured for active sensors, they provide a 14mA current limited supply. This low current is enough to light a LED or slowly turn a motor, but don't expect to get any significant (...) (20 years ago, 8-Dec-04, to lugnet.robotics)
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Message is in Reply To:
| | question about inputs & outputs
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| ok this is a funky idea, but I've already got some evidence it can work. I *really* need 4 outputs, but I only need 2 inputs for my project. Is there some way, using brickOS (I assume it's impossible without modifying firmware), to reprogram an (...) (20 years ago, 1-Dec-04, to lugnet.robotics)
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