Subject:
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digital ins
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 26 Aug 1997 16:42:47 GMT
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Original-From:
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david.j.dostal@NOMORESPAMlawrence.edu
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Viewed:
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1220 times
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Hi all,
At what voltage on the digital ins does one risk damaging the HB? I
want to feed an amplified signal to the digital ins on my HB to exaggerate
the response of a photosensor in the 2-3V range of its operation.
Unfortunately, this means that at the 5V end of its range, the input signal
will be near 10V. Will I fry my HB doing this? What are the maximum and
minimum safe voltages for the digital ins? Resolution and accuracy don't
matter at these extremum; I just want to know what the circuit can physically
handle.
Gracias,
David
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Message has 2 Replies:
 | | Re: digital ins
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| (...) 5.12 volts (...) Yes. (...) 5.12 volts max, 0 volts minimum (...) The correct solution to your problem is to use an op-amp signal conditioner, possibly feeding into a schmidt trigger if you need some hysteresis. (sp?) You can also rig a zener (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
| | | Re: digital ins
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| If you want to exaggerate the response, perhaps a LM339 +5v single supply comparator will do. Set up your circuit to go high(+5v) above your 2-3v range of operation. This solves all your input problems. Loads of manufactures make this thing. Data (...) (27 years ago, 27-Aug-97, to lugnet.robotics.handyboard)
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