How much current does the average USB flash drive consume? -- Sincerely, James Burkart *Filmmaker & Documentarian* *Burkart Studios* 415.738.2071 | Phone 925.226.4910 | Fax *Web:* burkartstudios.com *Facebook:* facebook.com/burkartstudios On Fri, May 13, 2016 at 12:21 AM, wrote: > Perhaps you can use a USB flash drive instead of an SD card. The PIC > will need > to be an MSD host for this. Flash drives can be very small today and > they will > take care of buffering, wear leveling and writing to the internal > flash. And you > can easily move it to a PC when you want to transfer the files. > > /Ruben > > On Thu, 12 May 2016 18:20:44 -0400, Neil wrote: > > I do (as always) have space limitations, and need to be able to move th= e > > card to a PC to retrieve the files, so would actually use a micro > > SDHC. I won't need more than 4GB anyway. > > > > Cheers, > > -Neil. > > > > > > > > On 5/12/2016 4:57 PM, James Burkart wrote: > >> Thanks Neil! > >> > >> If you're not limited by size you might want to consider writing to a > >> Compact Flash card. I don't believe there are any licensing issues and > it's > >> a parallel interface. For me CF is just a little too big. > >> > >> -- > >> Sincerely, > >> > >> James Burkart > >> *Filmmaker & Documentarian* > >> > >> *Burkart Studios* > >> 415.738.2071 | Phone > >> 925.226.4910 | Fax > >> > >> *Web:* burkartstudios.com > >> *Facebook:* facebook.com/burkartstudios > >> > >> On Thu, May 12, 2016 at 2:46 PM, Neil wrote: > >> > >>> James, > >>> > >>> I've also been concerned about the SD data rate for a data-logging > >>> device that I'm slowly working on, as I'm expecting to capture data > just > >>> a bit above the max rate of the SD card. But I really want the data = to > >>> be on a removable data card, so I'm considering circular-buffering th= e > >>> data to a RAM chip, and streaming that out to the SD card at the lowe= r > >>> rate. With the 4GB SD limit, I won't need 4GB of RAM, but I've > ballpark > >>> calculated I'd need just under 1 GB of RAM. Just need to figure out > the > >>> lowest cost option for the RAM. The values in RAM would be raw, then = in > >>> FAT32 format only when it's on the SD. > >>> > >>> I'll also consider compressing the data as it may help eliminate the > >>> need for the buffer RAM.. > >>> > >>> As for the FAT32 4GB limit, I'm pretty sure the next level (exFAT IIR= C) > >>> is proprietary/closed/expensive, so perhaps format the SD card into > >>> multiple 4GB partitions with the partitions labelled so you can get > them > >>> back in order? This would depend on how you plan to retrieve them. > >>> > >>> Cheers, > >>> -Neil. > >>> > >>> > >>> > >>> > >>> On 5/12/2016 4:31 AM, James Burkart wrote: > >>>> I aspire to make a small audio recorder. I need to decide how and on > what > >>>> it will record on, and how I will retrieve the files. > >>>> > >>>> I was originally considering having it record to microSD. Initial > >>> obstacles > >>>> I found were speed limitations from using SPI, and the FAT32 drivers= I > >>> was > >>>> looking into will only access up to 4GB. > >>>> > >>>> FAT Driver I am reading up on. > >>>> * > >>> > http://www.embedded-code.com/source-code/memory/secure-digital-mmc-memory= -cards/secure-digital-mmc-memory-card-fat16-fat32-driver > >>>> < > >>> > http://www.embedded-code.com/source-code/memory/secure-digital-mmc-memory= -cards/secure-digital-mmc-memory-card-fat16-fat32-driver > >>>> * > >>>> > >>>> Alternatively I was considering having the recorder write to flash > memory > >>>> and then retrieving the files via USB interface. I know next to > nothing > >>>> about attempting this method. Immediate obstacles for me would be > >>> figuring > >>>> out the whole USB thing, and finding/writing FAT32 drivers for use > with > >>> the > >>>> flash memory (or do I?). > >>>> > >>>> USB stuff I have found. > >>>> *http://www.signal11.us/oss/m-stack < > http://www.signal11.us/oss/m-stack > >>>> * > >>>> > >>>> I would appreciate any thoughts or input, suggestions, sources to > read, > >>>> what to consider, etc... > >>>> What questions should I be asking myself? > >>>> > >>>> Note: I would like to be able to record stereo 48kHz/24-bit but I wi= ll > >>>> settle on mono 44.1kHz/16-bit. > >>>> > >>>> -- > >>>> James Burkart > >>> -- > >>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >>> View/change your membership options at > >>> http://mailman.mit.edu/mailman/listinfo/piclist > >>> > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .