Subject:
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Sonar Transducer Multiplexor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 29 Mar 1997 03:38:58 GMT
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Original-From:
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MAR ERICSON <mar@cooper.edu^NoMoreSpam^>
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Viewed:
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1487 times
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In your BMP circuit diagram that you posted recently, why did you use an
open collector to feed the base of the transistor? Would it work if you
connected the digital signal directly to the base?
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
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Message has 1 Reply:
 | | Re: Sonar Transducer Multiplexor
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| (...) The OC is simply a protective buffer to the SPI pins. When the SPI feeds a low with a pullup resistor it must be able to sink the current drawn by the resistor. I read some of the docs on the SPI pinouts and ("M68HC11 Reference Manual" Serial (...) (27 years ago, 29-Mar-97, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: IR concept
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| In addition.... Perhaps I could use the on board IR header to turn on the 4 IR diode array with each diode in series with a current limit resistor and in parallel with the IR output header..?? (I think this has been suggested before.) (...) (27 years ago, 28-Mar-97, to lugnet.robotics.handyboard)
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