Subject:
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Re: sensor input mux calculations
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 30 Dec 1998 02:31:51 GMT
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Original-From:
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John Donaldson <JDONALDSON@GHG.NETihatespam>
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Viewed:
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1199 times
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Sinse it has been real quite at work, I did some designing and came up
with what I
think would be a solution. Using Sensor ports A & B, these could be tied
to sense the channel select lines of a Analog Multiplexer. The C port
would be connected to the output of the mux.
Thus with three inputs per port A & B, this would give upto 36
channels. With four inputs per port A & B, this would give upto 64
channels. Even lowering this down to only port A, you would have 16
channels for 4 inputs or 9 channels for 3 nputs. Each Analog Input to
the MUX would have a OP-AMP buffer. This way you could have any
combination of touch,light,temp, and rotational sensors. More than I
would think anyone could ever use.
The counter that drives the MUX could be toggled using the way the
light sensor activates the LED. By writing a task to toggle thru each
channel, each input could be sampled and stored in a varible for other
tasks to use.
More likely a 12 or 16 channel MUX should supply enough Inputs to
satisfy any project.
John A. Donaldson
MwalimuB@aol.com wrote:
>
> I'm not talking about using the touch switches. I would make my own switches
> - probably whiskers - but who knows. The advantage of A/D input is that
> instead of having two possible states, you have, in this case 1024. Using
> that fact you can make more than one input per port. It just take some
> ingenuity. That, I guess, is the point of LEGO MINDSTORMS.
>
> chris
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: sensor input mux calculations
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| I'm not talking about using the touch switches. I would make my own switches - probably whiskers - but who knows. The advantage of A/D input is that instead of having two possible states, you have, in this case 1024. Using that fact you can make (...) (26 years ago, 30-Dec-98, to lugnet.robotics)
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