> Has anyone (I'm sure there is) that has used a pic for datalogging?  More
> particularly, used an EEPROM  / FLASH /SRAM to store data?  I need to store
> about 25-30 samples per second for at least 20 seconds.  Any suggestions?
> It doesn't necessarily have to be non volatile especially if the write rates
> are too slow for NV, but it would be a nice touch.  I want to store data for
> later retrieval by a PC.
We build dataloggers, and our current product uses I2C interfaced
EEPROM.  MicroChip makes some, as do Atmel, Xicor, and maybe ST
Microelectronics.  Some are EE, some are Flash.

Watch out for the endurance specs, and make sure your applicaiton is
smart about how many re-writes it does, how often.

If you want removable cards, look at SanDisk's MultiMedia Cards, or
ISSI's SerialFlash, or MediaStick.  There's another new one that's
used on complex cell phones, too...

Many of the datalogger boxes that have come out lately use battery or
supercap backed SRAM, 'cause its so cheap per bit.  But the parallel
interface ones use a lot of PIC pins.

------------
Barry King, KA1NLH
Engineering Manager
NRG Systems "Measuring the Wind's Energy"
Hinesburg, Vermont, USA
barry@nrgsystems.com
"The witty saying has been deleted due to limited EPROM space"