SD card data storage questions
in [Design]
|
Prev: more EE Times nonsense
Next: unexpected delay in a TWT
From: Jan Panteltje on 14 Apr 2010 07:23 On a sunny day (Tue, 13 Apr 2010 18:46:55 -0700 (PDT)) it happened mpm <mpmillard(a)aol.com> wrote in <59e303d3-2683-4640-aa62-89e5a89b257f(a)u31g2000yqb.googlegroups.com>: >On Apr 13, 4:11�pm, Jan Panteltje <pNaonStpealm...(a)yahoo.com> wrote: >> On a sunny day (Tue, 13 Apr 2010 12:49:29 -0700 (PDT)) it happened mpm >> <mpmill...(a)aol.com> wrote in >> <34b89a39-d2d5-455f-bf25-356e6cfd9...(a)g30g2000yqc.googlegroups.com>: >> >> >Someone else mentioned an EEPROM / Serial Comm port solution. >> >This approach would also be cheap and easy, and quick to code/program. >> >I'm just wondering if there's an easy (easier) way to transport >> >(collect) the serial stream from equipment out in the field. >> >Obviously a laptop, or netbook..., but anything else? �Seems like that >> >would have been beat to death by now. (?) >> >> >-mpm >> >> It is called ethernet - internet. >> Implement an ethernet port. >> And then you do not have to go there. > >I'm picture-ing a backhoe out in the mud. Had to look that up: '? n. a mechanical excavator that draws toward itself a bucket attached to a hinged boom.' mm WiFi. You still need the ethernet port. Can be done for under 100$ if you are clever: http://panteltje.com/panteltje/wap54g/index.html#wapserver http://panteltje.com/panteltje/wap54g/io.html http://panteltje.com/panteltje/pic/io_pic/index.html So here you have it all, for less then 100$, SDcard, Ethernet, WiFi, a remote way via telnet to control the stuff, analog and digital I/O, PWM. Remote download from data also possible. Been there, done that. Beat my price ;-) >Are you suggesting an Ethernet connection on the data acquisition >device mounted in the backhoe? >To me, that seems like a worse idea than the serial port. > >It also just occured to me that I don't know how to spell "picture- >ing" :) Dictionary, google 'online dictionary', that is hoe I found 'backhoe'. >-mpm >
From: JosephKK on 15 Apr 2010 12:45
On Tue, 13 Apr 2010 11:24:15 +0100, "MK" <mk(a)nospam.please> wrote: > >"Richard Rasker" <spamtrap(a)linetec.nl> wrote in message >news:4bc43c4c$0$729$7ade8c0d(a)textreader.nntp.internl.net... >> Hello, >> >> I'm working on a stand-alone, battery-powered temperature monitoring >> device >> which collects a few megabytes of data over the course of a few weeks. The >> goal is to monitor the temperature of bearings and a clutch box of a heavy >> machine under varying loads, and evaluate these measurements afterwards. >> Most of this is a trival design matter, and I got almost everything >> running >> just fine within a few days. >> The only problem I'm still facing is data storage: I'd like to use an SD >> card (or Micro SD) to store this data, so that the user can transfer the >> data to a PC with minimal hassle. >> >> My questions: >> - It would appear that I need a license from the SD Card Association if I >> want to build (and sell) anything containing an SD card host circuit (see >> http://www.sdcard.org/developers/join/licensing/ "Host and Ancillary >> Products"). Now this would more than triple my development cost, in fact >> making it rather uneconomical to use SD cards -- this temperature monitor >> isn't meant to be built in any significant numbers (three, to be exact). >> Does anyone know more about these licensing requirements? >> - Does anyone have any information on how to write data to SD cards using >> a >> PIC controller? >> >> Any suggestions for a different data storage and retrieval mechanism are >> welcome too, of course, but I can't think of anything as easy to use as an >> SD card. Also, I'd rather not use a USB device, because the whole shazzam >> now runs off a 3V power source, whereas USB requires 5 volts. >> >> Thanks in advance for any suggestions, best regards, >> >> Richard Rasker >> -- >> http://www.linetec.nl > >Use a soldered in serial access Flash (Farnell have 1535453 16Mbytes for £9) >and dump the data to the PC via a serial port. Cheap and easy. The serial >port dump will be a bit slow (about half an hour for 16Mbytes @ 115.2kb) but >that should be OK for the use you describe. > > >Michael Kellett > You might look at the design of the PICkit 2 which has a usb interface and can store plenty of data in serial flash. |