Subject:
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Re: Question on analog(). Negative voltage
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 5 Jun 1996 13:37:18 GMT
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Original-From:
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Fred G. Martin <fredm@SAYNOTOSPAMmedia.mit.edu>
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Viewed:
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1855 times
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> Last time, I learned that the values of analog() corresponds to the
> voltage between 0 and 5. What if the signal to the analog port is
> a negative voltage. For example, -2 volt ? In that case, does that
> mean I have to use another formula or make some electronic circuit ?
> One application of this is to capture the signal from the speaker
> and then use the robot to recognize the signal.
DO NOT SEND NEGATIVE VOLTAGES INTO THE 6811, you will destroy the
analog input circuit. Any voltage outside of the 0 to 5 v range is
hazardous, unless it is current-limited to a few milliamps.
> As for the Rug Warrior, it has such function. For example 0 volt
> means analog()=128 and watever of negative voltage is analog()<128.
> Whatever of positive voltage is analog()>128.
Are you sure about this? On page 49 of my copy, it states pretty
clearly that the input range is 0 to 5 v.
So anyhow you need a circuit to convert your desired input range to
the 0 to 5v range. If your application is audio, you could just
rectify the signal to ignore the negative component.
-Fred
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Message is in Reply To:
 | | Question on analog(). Negative voltage
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| Last time, I learned that the values of analog() corresponds to the voltage between 0 and 5. What if the signal to the analog port is a negative voltage. For example, -2 volt ? In that case, does that mean I have to use another formula or make some (...) (28 years ago, 5-Jun-96, to lugnet.robotics.handyboard)
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