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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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| 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 (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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