AVR-Chat

--- In AVR-Chat@yahoogroups.com, Javier Fiasche <jfiasche@t...> wrote:
>
> Dave, why dont you try using Atmel Dataflash memories, i am using a 
> 2Mbytes SPI for a datalogger and works fine. Then, i am sending the
data 
> via com port to PC. The Pc does not need to have an special programm, 
> just Hyperterminal o anything like that, where you could capture the 
> data on the com port on an archive. Later you could open the data in
for 
> example Excel , an process it.
> Try looking on Google for "Built your own microcontrollers projects"
and 
> the MiniLogger V3.0
> Regards
> Javier
> 

When I started looking at this project, the memory chips were much
smaller, 256k or such.

I remember Atmel phasing out the chip i had used and replaced it with
another chips that was not interchangable.

One of the problems I had was how the memory was mapped.  IIRC it was
a whle page write, and the accessable memory was only a fraction of
the chips.  The address took up half the space....  vague memory of
the problems.

That is why I was looking at SD cards.

The miniLogger project looks interesting
http://chaokhun.kmitl.ac.th/~kswichit/logger3/logger3.html

He lists 10,000 reads per 512, but I'm not sure if that is 10k points
or 10k read of his 4 points....

To read 40 points per scan and scan once a minute, is 2,400 points per
hour, his 512k and 10k points would last 4 hours for me, or 8 hours
per meg.  (If I'm doing the math right)  I'm expecting a week minimum.

Dave