BTW, I found a couple possible solutions:
   - Jameco: 1Mhz 1/2-can ext oscillator @ $1.75 ea
   - BGMicro: 1Mhz crystal:  $0.75 ea
   - BGMicro: 262.144Mhz crystal: $0.75 ea

I'm picking up a few of the BGMicro units to test.

Cheers,
-Neil.



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Pic Dude
Sent: Thursday, June 13, 2002 1:55 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Pet feeder done!


Display multiplexing -- at 32.768Mhz, there is bad flicker. At
131.072kHz there is noticeable flicker, but not too bad -- sort of
like a fluorescent bulb, where occasionally you can see the flicker.
1Mhz would cure that for sure.
Yes, I've tweaked and tweaked and tweaked to try and reduce the
loop time and the display transition time.
I'm thinking even 200khz might do the trick though.
Cheers,
-Neil.

-----Original Message-----
I like to use 32.785 Khz watch crystals for timing things. The added
benefit is low power, because of less transistions of the PIC oscillator and
associated stuff. The crystals are quite accurate, and the PIC doesn't care
how slow it goes. I can't imagine anything that has to happen at >1MHz in a
dog feeder.
--Lawrence

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