Subject:
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Re: main() Reset -- THE SAGA ENDS !! ---
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 3 Jan 2002 02:50:18 GMT
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Viewed:
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5486 times
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Awsome!!! Now we are expecting great things from you :-)
-Dan
In lugnet.robotics.handyboard, John R. McDaniel writes:
> Fellow Lugnuts,
>
> Doe anyone want to purchase a 74HC244 (U5) that "kinda works" ? YES, YES,
> believe it or not, U5 was my problem !!
>
> The mystery is not totally solved, because even using both a logic probe
> and an o-scope, I cannot see any indication that U5 was defective. My order
> for a few of the HB integrated circuits that weren't in my junk box arrived
> this evening and I started changing out chips.... swapped U5 and
> BINGO.....joy, joy, joy.
>
> I put the old 74HC244 back in and the problem reappears.
>
> Anyway, I really have to thank Fred, Dan, Garry, Mark, and Matthew for
> sticking with me.
>
> Several of you mentioned the possibility of a "stuck" START switch, and even
> though I could read the START button just fine with the START_BUTTON
> command, it sure smells like it was a related problem since the START and
> STOP buttons go through U5......go figure.
>
> I'd still like some feedback on whether I goofed on the "auto-start" vector
> location (0x8000), but the really important thing is that I've made contact
> with a great bunch of guys who really helped me slog through this
> problem.....I was really getting discouraged.
>
> Thanks again to you all. I hope I can return the favor someday.
>
> Now on to the next phase of building my tracked robot.
>
> One more time -- a million thanks.
>
> (Hmmmmm, maybe it was really one of those incantations my wife uttered!)
>
> John
>
>
> In lugnet.robotics.handyboard, John R. McDaniel writes:
> >
> > Matt,
> >
> > The only mod I've made to my HB is to cut the motor power supply "+" trace
> > and use a separate motor power supply. See my post/response to Dan for my
> > explanation of that.
> >
> > After reading your START button question, I triple checked. I don't believe
> > the problem is there because I can use the " start_button " command and read
> > the button. I get a 0 (zero) when not pressed and a 1 (one) when pressed.
> > If the START button were 'stuck' in the pressed position, I should be unable
> > to ever read the 0 (zero) state. You agree?
> >
> > Ohhh, no, you can't be out of ideas, my HB is still sick. Running out of
> > ideas is not allowed! So far, curses, incantations, spell casting, and
> > threats have failed. I'm thinking about a reward.....!
> >
> > Thanks,
> >
> > John
> >
> >
> >
> >
> >
> > In lugnet.robotics.handyboard, Matthew D. Stock writes:
> > > Since it seems like everything else has been checked, I have one other
> > > suggestion after looking at my pcode source. If the "start" button on the
> > > HB is pressed during power on, the autostart will be disabled. Has your
> > > hardware been hacked at all, where possibly the button is pressed?
> > >
> > > If that's not it, I'm out of ideas.
> > > -Matt
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Message is in Reply To:
 | | main() Reset -- THE SAGA ENDS !! ---
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| Fellow Lugnuts, Doe anyone want to purchase a 74HC244 (U5) that "kinda works" ? YES, YES, believe it or not, U5 was my problem !! The mystery is not totally solved, because even using both a logic probe and an o-scope, I cannot see any indication (...) (25 years ago, 3-Jan-02, to lugnet.robotics.handyboard)
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