Subject:
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HB's analog inputs
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 26 Aug 1998 18:35:10 GMT
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Original-From:
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edmund <ho106@singnet.com.SAYNOTOSPAMsg>
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Viewed:
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1156 times
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does anyone know if the handy board's analog inputs can accept analog
current output(4-20mA) from a photo-electric distance sensor? (e.g. the
sensor might return 4mA if the object is 1 ft away and 15mA if it's 3 ft
away) or can it only accept analog voltage output(0-5V).
if the function 'int analog()' is used and the analog input is 2.5V, would
the handy-board return a value of 127? i believe the range of values is
from 0-255 for 0-5V. what if the analog input is current?
the distance sensor i'm going to buy comes with either a current or a
voltage output and i don't know which will suit the HB best. can anyone
help? thanks in advance.
edmund
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Message has 1 Reply:
 | | Re: HB's analog inputs
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| (...) Edmund, Typically the solution is to pass the 4-20 mA through a 250 ohm resistor and measure the voltage across that resistor. As long as your A/D input impedance is high, it can be ignored. A resistor is essentially a current to voltage (...) (26 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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