Subject:
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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 14:33:54 GMT
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Viewed:
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2417 times
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I think Sven thought of this first. Anyway I threw a circuit together
last night that uses the SetSensorType to switch between 4 inputs. I put
it on a page at:
http://ourworld.compuserve.com/homepages/Michael_Gasperi/mux.htm
It seems to work well, but startup is a problem. It starts out on input
1 but if you stop the program it can get lost. I need to add a reset
circuit. Any suggestions?
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Message has 3 Replies:
 | | Re: Multiplexing Input Circuit
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| (...) Require it to be clocked every so often, reset if it is held high for a certain length of time. Alternatively, it may be possible to drop the voltage to zero - but that would require a firware change... anyway, I'll look into it out of (...) (26 years ago, 12-Nov-98, to lugnet.robotics)
| | | 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)
| | | Re: Multiplexing Input Circuit
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| A simple RC circuit will work for the reset. In your code, make the first time you turn on power to the sensor delay a little longer, and the delays between subsequent readings short. I was discussing this with a co-worker, and the possibilities of (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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