Subject:
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Re: Micro-Switches, Mux
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 27 Feb 2001 17:49:56 GMT
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Original-From:
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Tim Hatch <vbq@myrealbox.com+NoMoreSpam+>
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Viewed:
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556 times
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See http://www.plazaearth.com/usr/gasperi/3rmux.htm for a 3-input design
(which I tried to build and made it look very nice--but I was remembering
the values from memory. I ended using resistors a factor-of-1000 too small
;))
However, I don't think that'll help much with a 4-mux. There is only one
4-mux I've ever seen on the web, which is available at
http://www.akasa.bc.ca/tfm/lego_resistor.html
Tim
----- Original Message -----
From: Stef Mientki <s.mientki@ids.kun.nl>
To: <lugnet.robotics.rcx@lugnet.com>
Sent: Monday, February 26, 2001 5:41 PM
Subject: Re: Micro-Switches, Mux
> Knowing the resistor inside the RCX is 10 kOhm, you should use a different
> resistor for each switch,
> the first resistor should be 10 kOhm, the second 30 kOhm, third 70 kOhm, • fourth
> 150 kOhm, this will divide the 5V range in nearly evenly spaced sections
>
>
> Ciaran Jessup wrote:
>
> > Hi, has anyone had any joy combining the input from several • micro-switches
> > into one RCX input, I've built a simple multiplexor for three lego touch
> > sensors, but now I need four!! .. I know this can be done by adjusting • my
> > current design, except I can't afford to wait for the three weeks it • will
> > take for me to receive a new Lego Touch sensor from dacta, however I • have
> > lots of micro-switches lying around.
> >
> > I imagine its easier to combine many micro switches as they are just • simply
> > on off switches so the boundaries are much easier to compute...
> >
> > Thank you very much for any help you can provide
> >
> > - Ciaran
>
> Stef Mientki
>
>
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Message has 1 Reply:
 | | Re: Micro-Switches, Mux
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| hi Tim, I've made an overview of the different kinds of multiplexers (including mine :-)), and the ultimate suggestion to mux up to 8 switches. If you still not believe, you can download the Excel program from the same page. (...) -- met (...) (24 years ago, 27-Feb-01, to lugnet.robotics)
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