You really shouldn't need any external clocking to time a 1 second interval,
unless you want to use a clock derived from the AC mains.

What kind of accuracy do you need?

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: Peter May <manager@SALE-NET.COM.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, January 07, 2001 8:15 PM
Subject: [PIC]: Acurate time interval and help with shift in out


> I noticed a posting just recently re a 1 second time interval. I need to a
> very acurate 1 second interval to output data via a serial pin at 1 second
> intervals. I was wondering if I would be say better to develope an
external
> timer with a 1 second pulse to run an interupt?
>
> Secondly. I want to write details to an eprom (different project) and have
> it recall it at a later stage. It's a weather station I am building for my
> self as a learning tool. I want to store the figures like time, temp, wind
> direction in degrees, etc etc etc.
>
> I have no idea how to do this and see things like shift in shift out
> mentioned everywhere but do not actually understand what all this is. Are
> there any good examples on how to do this out there anywhere? Also given
the
> above example how do I figure out how many bytes each reading would take
up
> and therefore how many readings I can store?
>
> Thanks.
>
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