Post by thread:Ram for datalogging

> 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 spam_OUTbarryTakeThisOuTnrgsystems.com "The witty saying has been deleted due to limited EPROM space"

part 0 1833 bytes content-type:text/x-vcard; charset=us-ascii; name="vcard.vcf" (decoded 7bit) Pailoor Barry King wrote: {Quote hidden}> > 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 > .....barryKILLspam@spam@nrgsystems.com > "The witty saying has been deleted due to limited EPROM space" -- Website : http://business.vsnl.com/chiptech Content-Type: text/x-vcard; charset=us-ascii; name="vcard.vcf" Content-Description: Card for Ravi Pailoor Content-Disposition: attachment; filename="vcard.vcf" Content-Transfer-Encoding: 7bit Attachment converted: wonderland:vcard.vcf (TEXT/CSOm) (0000762C)