ATMEL microcontroller + USB memory stick

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Ray - 26 Dec 2005 16:00 GMT

I want to build an small data logger based around ATMEL's 8535 (or one of
the AVR Mega).
I need to log around 300MBytes of data. USB memory sticks are cost effective
storage mediums. Is there a simple way to interface a USB memory stick with
an ATMEL microcotroller?

Ray

Reply to this Message

Joe G (Home) - 26 Dec 2005 18:22 GMT

Hi Ray,

A USB memory stick is a USB device/peripheral and is designed to be
connected to a USB host (Eg a PC with USB host stack in XP etc).

The problem is - your ATMEL micro needs software that implements a USB host
stack of a PC.

Have you considered other flash storage mediums like SD, CF or MMC cards and
a FAT file system so your PC can read the file stored on these cards?

Just a thought.

JG

>I want to build an small data logger based around ATMEL's 8535 (or one of
> the AVR Mega).
[quoted text clipped - 5 lines]
>
> Ray

Reply to this Message

newtype - 26 Dec 2005 20:54 GMT

> ATMEL's 8535

here's a USB IC

http://www.beyondlogic.org/usb/ftdi.htm

Reply to this Message

Adrian Jansen - 26 Dec 2005 22:28 GMT

>>ATMEL's 8535
>
> here's a USB IC
>
> http://www.beyondlogic.org/usb/ftdi.htm

Plenty of USB slave devices around. But you need a USB host to talk to
a memory stick.

Much easier to talk to a CF card for datalogging from an AVR. Code
already exists to talk to a FAT filesystem on a card with an AVR.

Signature

Regards,

Adrian Jansen adrianjansen at internode dot on dot net
Design Engineer J & K Micro Systems
Microcomputer solutions for industrial control
Note reply address is invalid, convert address above to machine form.

Reply to this Message

Michael C - 29 Dec 2005 01:05 GMT

> Much easier to talk to a CF card for datalogging from an AVR. Code
> already exists to talk to a FAT filesystem on a card with an AVR.

Much easier to use SD I would have thought, less pins.

Michael

Reply to this Message

Jasen Betts - 26 Dec 2005 21:26 GMT

> I want to build an small data logger based around ATMEL's 8535 (or one of
> the AVR Mega).
> I need to log around 300MBytes of data. USB memory sticks are cost effective
> storage mediums. Is there a simple way to interface a USB memory stick with
> an ATMEL microcotroller?

for that task you'd need a microcontroller that has usb master
functionality, many can function as slaves (eg behave like a
memory stick) few can function as masters (eg read or write write
to an attached stick)

ATMEL have app notes on interfacing their serial eeprom chips to their
microcontrollers would it be practical to use that for storage
provide USB interface for download?

AIUI these eproms cost about the same or less than the USB sticks.

Bye.
Jasen

Reply to this Message

Michael C - 29 Dec 2005 01:04 GMT

>> I want to build an small data logger based around ATMEL's 8535 (or one of
>> the AVR Mega).
[quoted text clipped - 14 lines]
>
> AIUI these eproms cost about the same or less than the USB sticks.

Can you get these eeproms is 300MB though?

Michael

Reply to this Message

Jasen Betts - 29 Dec 2005 09:50 GMT

>>> I want to build an small data logger based around ATMEL's 8535 (or one of
>>> the AVR Mega).
[quoted text clipped - 16 lines]
>
> Can you get these eeproms is 300MB though?

hmm, no. Atmel only goes to 256K.

sounds like one of the generic serial flash cards like SD or XD might be the
answer.

Bye.
Jasen

Reply to this Message

Electronics Forum / Electronics / December 2005

ATMEL microcontroller + USB memory stick