AVR-Chat

--- In AVR-Chat@yahoogroups.com, Robert Adsett <subscriptions@a...> 
wrote:
> At 08:32 AM 7/15/04 -0400, you wrote:
> >I didn't read all the thread on this but somewhere I saw someone 
talking
> >about 100%. If you only log the time when a certain amount of 
change is is
> >make you should know ahead how many readings you will have logged.
> 
> That assumption is valid for monotonically changing systems.  Since 
we 
> talking about daylight over a period of a week the signal is 
certainly not 
> monotonic (well on most of the globe).


This idea has some valid points. 
soil temperature and soil moisture will be very slow change variables 
so even with a time stamp, it would be a valid concept.

as for light, this brings up an interesting study and probably one 
that will gain students interests and that is comparing the growth 
rate of identical plants in varying conditions.

Will a tomato plant for instance, grow faster with 4 hours of direct 
sun or with 8 hours of the the same total light intensity ?

I think there could be two seperate data loops. one continuous and 
one calculated.  Even with the time stamp, the calculated same would 
only change about 50 times a day at maximum so the total samples will 
be small.

Dave

"Patriotism is supporting your country all the time, and your 
government when it deserves it" 
-Mark Twain