On 3/31/2011 12:40 PM, jb-electronics wrote:
Hi folks,
In a little test run, the clock was connected to the main power supply (wall
wart) and worked fine. I let it run for about 1 hour. Then I removed the wall
wart, and it switched to battery. But now get this: The PIC suddenly got really
warm, and when I re-activated wall wart power, nothing happened. The PIC cooled
down, though, but the software hung. So I removed the PIC, removed the
batteries, reinstalled everything, and the problem has not occured since.
But I am quite confused. Why did something happen in the first place?
Best whishes,
Jens
Jens,
Why do you use a relay? It is not needed. The diodes provide the switch function
for you.
The PIC may have seen a voltage glitch which sent it into some bad mode, like
CMOS latchup. Cycling the power off then on would clear the latchup condition.
I would remove the relay K1 and replace it with a toggle switch to allow the
owner to turn off the batteries if the clock will be unplugged for a long time.
The switch would be turned ON to provide the battery backup feature.
--
David Forbes, Tucson, AZ
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