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Actually Jake, I'm having a similar problem right now, with regard to
loss of RAM capabilities.
I've been testing a new Polaroid 6500 sonar (which now works!) on the HB
and I've got it hooked up through the exp. board. I tried to run a simple
program that used actuated two servos, two motors, while polling one analog
input. It seemed to work without the Polaroid connected, but when I fired
it up with everything loaded on, it died, and now my HB can't seem to hold
it's RAM with the RJ11 cord connected to the charger/dler. I'm not completely
sure how the servos are powered/oscillated (etc.) so I haven't been able
to locate where I might have suffered some kind of power surge (possibly
from the sonar ranging board)... does it make any sense to think that
the sonar could have any affect on other periferals without being directly
powered up?... How ARE the servos on the Exp. Board driven?
thanks for any help,
John
p.s. On a somewhat different subject... I was wondering: Can the analog(n)
function be polled at any rate with success, or is it necessary to check
the CCF flag on the ADCTRL register (0x1030) be checked before
everytime and before the call to analog()? I'm reading an analog port quite
rapidly and I just wanted to know if this precursory check needed to be done.
If so, is the same true with the exp. board analog ports?
THANKS!
In lugnet.robotics.handyboard, Jake Burkholder writes:
> Hi,
>
> A while ago I shorted out my handy board which caused the ram chip to fry.
> I've since replaced it, and the board boots again, but I am now seeing
> other strange behaviour.
>
> The batteries are connected and the board recieves power, but when I turn it
> off the contents of RAM is lost unless the rj11 jack is plugged into the
> charger/serial board. The charger board need not be plugged into the wall, so
> the power is coming from the batteries, and I've checked with a voltage meter
> that there is always +5v to the RAM chip. If I turn off the board and unplug
> the rj11 jack, the board no longer boots and the pcode needs to be reloaded.
> If I really quickly turn it off, remove the rj11 jack and turn it on again, it
> works but then if I leave it off for more than a few moments the RAM is lost.
>
> If I call sleep() or msleep() or anything that uses them from IC the heart
> beat stops and I have to reset the board.
>
> The infrared input/ouput seems to work fine, and I have an expansion board
> with a polaroid sonar, and it works fine too. Normal IC stuff, printf etc.
> works fine.
>
> What I believe happened with the catastrophic failure of my ram chip is that
> the pins on the bottom of the board pierced the insulation on the wires to the
> battery. I disconnected it quickly but there was smoke and sparks. The board
> worked perfectly before this, and booted right up on replacing the RAM chip.
>
> Any help is appreciated...Thank you
>
> Jake
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Message has 1 Reply:
 | | Re: handy board troubles...
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| (...) ^^^^ Do you mean without? That's my problem; the board only holds its data if the cord is plugged in. (...) I've also got a servo which I can't figure out how to drive from the exp. board, but the problem of the RAM discharging happens even (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | handy board troubles...
|
| Hi, A while ago I shorted out my handy board which caused the ram chip to fry. I've since replaced it, and the board boots again, but I am now seeing other strange behaviour. The batteries are connected and the board recieves power, but when I turn (...) (25 years ago, 20-Mar-00, to lugnet.robotics.handyboard)
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