Subject:
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Re: Og Needs More Inputs (fwd)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 28 Apr 1999 22:11:18 GMT
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Viewed:
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1064 times
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Jim Choate <ravage@einstein.ssz.com> wrote:
> ----- Forwarded message from Kekoa Proudfoot -----
>
> From: kekoa@pixel.Stanford.EDU (Kekoa Proudfoot)
> Subject: Re: Og Needs More Inputs
> Date: Tue, 27 Apr 1999 21:57:41 GMT
>
> Also, pairing up a light sensor and a touch sensor only works if the lights
> are not very bright. Pointing the light sensor at a bright light (e.g. the
> sun) generates touch events.
>
> ----- End of forwarded message from Kekoa Proudfoot -----
>
> That's not exactly accurate. It doesn't work *if* you configure the touch
> switch to recognize positive rail saturation.
>
> If you go the other way and bias the photdector so it *never* goes to
> ground (not too hard considering it's a resistor and it isn't much fun
> trying to watch a robot in the dark) and then configure the touch sensor
> to go to ground you can have a dual use input.
Actually, I retract what I said about the light sensor and the touch
sensor, but not on the grounds you stated, or at least on clearer grounds
than you seemed to explain. (That you can configure the touch sensor or
bias the photodetector seems to imply that you suggest adding components to
the standard LEGO-only system, which I assumed was not possible, since the
post I was responding to had placed such a restriction...)
I had forgotten that the light sensor never drops its voltage as low a
pressed light sensor does, and therefore you can at least tell when the
touch sensor is being pressed no matter how bright the light. With that in
mind, you can use raw sensor readings to read the light sensor when the
touch sensor is not pressed, and you can detect touch sensor presses when
the raw reading drops sufficiently low.
-Kekoa
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Message is in Reply To:
 | | Re: Og Needs More Inputs (fwd)
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| ----- Forwarded message from Kekoa Proudfoot ----- From: kekoa@pixel.Stanford.EDU (Kekoa Proudfoot) Subject: Re: Og Needs More Inputs Date: Tue, 27 Apr 1999 21:57:41 GMT Also, pairing up a light sensor and a touch sensor only works if the lights are (...) (25 years ago, 27-Apr-99, to lugnet.robotics)
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