AVR-Chat

> 
> OK a weeks worth is ~ 100K at max sampling.  Using the largest FRAM 
chips 
> that would be 4, maybe 5 per board.  Probably doable on space.  
Would need 
> to check cost though.  I suspect it's no more expensive that a MMC 
> connector + card.  Might well be cheaper.  If it's for a student 
device 
> does it need a full week?
> 
> The bigger issue I see is you are talking about an awful lot of 
data for 
> the students to analyze.  For the 1/min you are talking about 42000 
> points.  Will your spreadsheet (or whatever analysis program) 
handle 
> that?  And if it does will it do it w/o slowing to a crawl?  It 
would be 
> easy to create a dummy data file to check that out.


oh, so you're saying there are leaves on those twigs ?

 



> One last data question.  What are you trying to track with the 
brightness 
> measurement?  Do you really expect to see a significant change in 1 
> minute?  I would have guessed a 5 minute period made more sense 
(maybe even 
> longer at night).

A bush in shade will see light when the blocking thing moves 
relitaive to the sun.  Imagine tree or tree trunk that acks like 
gnomon.  as the Earth rotates, the Gnomon will appear to move and the 
plant will be blocked for some period.

How much sun a leaf gets from being in shade vs a cloudy day.  That 
sort of thing.

Dave