[OT?] Looking for a large FIFO subsystem

Mcrocontroller,ram, battery is all you need.

Sorry, I should have made clear I was looking for something off the shelf.

As you specified the internal components i assumed you wanted to make it yourself. You seem to be descibing a data logger you might look at that. It's a pretty trivial to make yourself (depending on your exact spec) or you get someone to make them for you.

Hello

I need some more information before I can help you.

Do you want it to be a portable unit or fixed in a car?

What is the name of the GPS reciever that you want to use?

What kind of power supply is available?

Rune Christensen Engineer

Portable, but need not be battery powered. Used in car would be powered thru cigarette lighter adapter. Otherwise powered by a wall wart.

I was thinking any of any of the GPS mouse receivers.

nominal 12 VDC

As I'm looking for only a couple of units, I was looking for something on the retail market.

As someone else has pointed out it would be simple enough to build. I haven't done any component level hardware in `30 years. I would even have to go out and buy a soldering iron ;)

thank you

I think the best solution will be a microcontroller connected to a MMC card.

For example you could use the microcontroller board

The microcontroller board has a serial connection and a USB connection. The prototype board has a MMC/SD socket. The cost of this two boards together with a LPC2138 is 53 EUR.

You will be able to produce a prototype on this system but I don't think it will be the best system for the final product.

Another solution could be a PDA with a serial port and a compact flash card.

Yet another solution could be

There is just one problem with all this solutions there is no ready to use firmware. You need to develop the firmware.

Rune Christensen Engineer

Rune,

Does your solution meet the OPs "low cost" requirement ??

If the OP would please let us know if he is looking for a complete and running Off-The-Shelf system that logs RS-232 data ( from any source ) or is looking for a Do-It-Yourself solution.

$95 for the 128MMC hardware, $139 for FAT file system, OPs time to learn the systems involved and code this up himself.

It would seem if the OP would like to code something up himself, (I assume the OP has some idea how to do that)

To keep the cost and time down ( time is money ). It would be quicker to build a smaller version that has just a micro ( AVR, PIC,etc) latches for address and data lines, then just use a big flash chip. Capture serial data into the flash. Simple command parser would allow to retrieve the data at a later date.

Just my simple idea.

Donald

I found a commercial product

Rune Christensen Engineer

That's almost exactly what I was envisioning. But faster and more storage capacity ;) Least expensive unit listed on their oder page is for a 128MB unit which is 10X what I need. The descriptive portion of page lists 32MB as smallest - price differential probably would not be worthwhile.

I'll also take a closer look at the boards mentioned in your previous post. Software creation not a problem as I'm doing this as a personal project so I can legitimately cost out my time as "no cost". Might actually list it as "negative cost" due to value of the learning experience.

Thank you

You may want to at a hand held GPS rather than building something yourself. I know the Garmin hand held GPSs have a track faculty which with the correct software you can then download to a PC.

For software have a look at:

And try searching on the web for GPS Track.

Kevin.

No to handhold GPS. Yes to not building hardware myself. My interest has very little to do with the navigation ;}

My original interest in GPS was to to "prove" to my supervisor that I was expeditiously completing my route of 4-12 stops, 400-550 miles, over

As I learned more I became fascinated with error terms and their periodicity. There were scatter plots of horizontal errors. There were plots of error magnitude versus time. I wanted x, y, z versus time and for multiple days.

If I use a non-WAAS receiver I bet I'll "discover" a primary variation with a 24 hr period ;}

Rune Christensen referred me to "AntiLog RS232 data logger"

I have found another microcontroller board

Another possible solution could be this board

Rune Christensen Engineer