Subject:
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Re: Expansion board & V2X & sonar
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 15 Feb 1999 16:44:16 GMT
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Original-From:
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Fred G. Martin <fredm@media^IHateSpam^.mit.edu>
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Viewed:
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1382 times
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re: exp bd SPI pins:
* 2 of the pins are used by the sonar and aren't separately
available.
* the other 2 SPI pins are at PCB holes J20 and J21.
see the schem for details:
http://el.www.media.mit.edu/projects/handy-board/hbexp30/expsch30.gif
if you need all 4 spi pins for something, leave out the j11 sonar
connector and tap the signals from there.
fred
In your message you said:
>
> > the SPI port D is tied up by the compass, I was wondering if directly
> > connecting the digital output-pins of the expansion board can be used to
> > trigger the sonar pulse and set the BINH.
>
> I am the guy who wrote the V2X code that is on the HB web site. I
> just got an expansion board, and am looking into v2X and sonar on the
> exp board right now.
>
> > Will the triggering or
> > blanking use more than the allowed 5 mA per output? Will the timing be accur • ate?
> > Instead of poking (0x1008, 0x20) like in sonar.c could I just use
> > set_digital_out(x) to start the ping (and turn on BINH
> > in the same way)?? Would it be enough to just resolder the INIT and BINH
> > lines to the digital output ports of the expansion board or would I need
> > further modifications?
>
> I cannot find where there are pins for the SPI port on the expansion
> board. Yup, the breadboard area would work, and I have thought of
> that.
>
> The SPI port is maybe overkill, so I am thinking that I'll just have
> like a timed process that, say every 500msec (configurable), it takes
> a heading. Then with the extra output pins, I'll be able to disable
> the compass, and send calibration signals, and resets. I think it'll
> be better. If anyone else is working on v2x, I'd love to hear about it.
>
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Message is in Reply To:
 | | Re: Expansion board & V2X & sonar
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| (...) I am the guy who wrote the V2X code that is on the HB web site. I just got an expansion board, and am looking into v2X and sonar on the exp board right now. (...) I cannot find where there are pins for the SPI port on the expansion board. Yup, (...) (26 years ago, 15-Feb-99, to lugnet.robotics.handyboard)
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