Matrix user forums

Hi

I have a data aquisition project and need to store 99 sets of data around 200bytes/set aquired by PIC18F4550 from a sensor with SPI comm, as the data needs to be secure I'm loading each data set to the internal EEPROM. I am considering an additional 32kb EEPROM using the PICs to buffer the data sets and copy to the external EEPROM, the pic will then access all the data via the USB. There is bags of time between set aquisitions, the accumulated data in the external EEPROM is to be uploaded to PC via the USB function with Labview.
Q. Which is best, SPI or I2C for the external EEPROM?
Q. Is this approach the most elagant solution?

Gary

Hello Gary,

SPI or I2C doesn't really matter. SPI is generally faster but requires more I/O pins and you may be limited by the speed of the memory anyway.

Flash is generally quicker then EEPROM if your looking for speed and also does not have the inherent 10,000 read write cycle limitation.

What about using a SD card instead of the EEPROM? This way you can store data in a separate files if you wish etc.

Benj

Thanks for the quick response, the hardware is destined to fit in a 'memory stick' size footprint so I'd rulled out SD and micro SD's but I accept your tip on SPI and flash with thanks

Gary