Jesse,
I did something similar to this some time ago.  I used a PIC 12C509 with
the LED across an output pin and no resistor.  The program turned the
led on and went to sleep for a 22mS(1 sleep cycle).  Then when it came
out of sleep it would clear the port so the led would be off and I would
enter sleep again for about 100 mS(4 sleep cycles). Then on again for 22
mS and then off for 2.3 S.  The power source was 2 AA batteries and the
life was just about a year.  This produced a definite double blink of
the LED.
bill


Jesse Lackey wrote:
> Hello all,
>
> I have a project that involves blinking LEDs that the client would like
> to have run for 2 months per battery or battery set.
>
> 2 9V wired in parallel would do it and is preferable to 4 AA.
>
> Is this a reasonable thing to do?  Is it dangerous at all if both are
> fresh of the same kind?  How about if not?  Would a 5ohm resistor in
> series with each before being wired in parallel alleviate any dangers
> from users who don't follow directions?  (its a consumer product).  The
> current is pretty low so the loss due to a small resistor is not a problem.
>
> Any advice?
> Thanks ...
> Jesse
>
>
>
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