Subject:
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Re: Analog I/O as Digital I/O
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 27 Sep 1999 09:43:26 GMT
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Original-From:
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Will Hein <wfh@AVOIDSPAMandrew.cmu.edu>
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Viewed:
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792 times
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> Can the analog input lines be used as a digital input lines (if there is
> no requirement of analog input)? Because, these lines are connected to
> the port E of 68hc11, then what are modifications required in the code?
Since the analog inputs read voltage levels, you should be able to just plug
in any switch or 5-0volt input directly. To read the values, use the analog
command, and in theory you should only get two possible values, 255 for
+5volts, and 0 for 0 volts. Depending on if your inputs are driven logic
versus switches, you may need to threshold these values and consider
anything above maybe 200 to be a logic high and anything below 50 to be a
logic low. But if you are using precisely 5 volts and 0 volts, or an open
and closed switch, than the extreme values should be accurate.
-Will Hein
Carnegie Mellon University
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Message has 1 Reply:
 | | Re: Analog I/O as Digital I/O
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| Also, the "digital(int p)" extends to the analog ports too. When used with a port that is analog in hardware, it just uses 127 as a threshold value to return 1 or 0 (note below 127 returns true). See page 22 in the HB manual. However, with this (...) (25 years ago, 27-Sep-99, to lugnet.robotics.handyboard)
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