Subject:
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Re: Multiplexing Input Circuit
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 12 Nov 1998 16:26:32 GMT
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Viewed:
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2336 times
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Larry Coffin wrote:
> Is your counter set up as a binary counter? From your diagram it
> looks like there are times that more than one sensor would be active -- say
> on count 3 both O0 and O1 would be active, right?
>
> Do you need to have bit 5 connected to the reset line? I would
> think you could simply continue counting -- the other lines might go high
> but the four lines you are using should just wrap back around.
>
> From your diagram it looks like your sensors are sharing a direct
> connection to the RCX input port. Did you have any trouble with orientation
> of the contact on the RCX? When I tried the same setup (through my MUX
> though) I found that I would get bad sensor readings when it was connected
> in one orientation and good readings when rotated 180 degrees. I assumed
> that there was something going on that had one sensor continue to feed a
> signal back to the RCX even after it was not supposed to be selected.
The counter is a CMOS decade counter that has only one output high for each
count. There is only one analog switch on at a time. The counter is reset
when it hits the value 5 so it jumps back to 0 to start over.
The analog switch is bidirectional and I don't think there are any problems
with signal polarity.
You could use a binary counter and a real analog mux for this circuit and get a
lot of inputs but these were the parts I had.
Thanks for the input. Mike G.
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Message is in Reply To:
 | | Re: Multiplexing Input Circuit
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| (...) Looks good! How about using the third input port to assert the reset line and set the counter back to zero? Is your counter set up as a binary counter? From your diagram it looks like there are times that more than one sensor would be active (...) (26 years ago, 12-Nov-98, to lugnet.robotics)
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