Subject:
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Re: Pull Up Resistor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 5 Aug 1998 15:45:49 GMT
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Original-From:
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Rick Moll <rickmoll@SPAMCAKEmvp.net>
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Viewed:
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1835 times
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Sheridan Edward Ethier wrote:
> The polaroid documentation mentions that a 4.7K resistor should be placed
> between ECHO and Vcc. Should this be done when interfacing to the HB?
The sensor connectors on the HB already have pullup resistors on the signal
inputs (as I recall they were 47K), so you shouldn't need to add an
additional pullup. If you want to make sure, just check the signal
connection with a voltmeter to verify that it's close to 5V when the sonar is
not being pinged.
Rick
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Message has 1 Reply:
 | | Re: Pull Up Resistor
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| I checked the ECHO signal and found it to be at 2.0V when plugged into TIC3 on the HB. I also applied a pull-up resitor which did send ECHO to 5V when not pinging. However, in both cases, I still had seemingly random positive and negative values (...) (28 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Pull Up Resistor
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| Hi, The polaroid documentation mentions that a 4.7K resistor should be placed between ECHO and Vcc. Should this be done when interfacing to the HB? Thanks, Sheridan (28 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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