Subject:
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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 02:36:57 GMT
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Viewed:
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5561 times
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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 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 has 1 Reply:
Message is in Reply To:
 | | Re: JRM code and Reset
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| 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 (...) (25 years ago, 3-Jan-02, to lugnet.robotics.handyboard)
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