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'Miniature Data Loggers'
2000\05\01@155601 by Dr. Chris Kirtley

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Dear all,

Sorry for forgetting to change the title on my posts about the miniature
insole datalogger.

I am keen to find a nice solution for this, because I think I could use
it on several other projects in biomedical engineering.

I'm starting to understand the problems, and the most important would
seem to be memory constraints. Ideally, I'd like to be able to record
for a
whole day from, say, 4 sensors. The logger could turn off when there's
no
activity, so in all this might mean only around one hour of data. At 25
Hz, I make this 25x4x60x60 = 360k. So maybe I could get by with 256k if
I'm
clever - what do you think?

Power, as you say is also a potential problem. I was thinking in terms
of a lithium button cell, but the ideas about using piezo or kinetic
power
generation is certainly worth pursuing - thanks.

Alice suggested using an 8-pin 12c5xx with built-in
ADC, and an antenna printed onto the circuit board with inductive
pickup for downloading. 1 data line, 1 dump switch, 3 lines to control
memory chip.  total program size 600 bytes, onboard rc clock.

This sounds great! What do people think?

TIA,

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 131 (office 105b)
Catholic University of America
Cardinal Station   (or 620 Michigan Ave NE)
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4499
Email: spam_OUTkirtleyTakeThisOuTspamcua.edu
http://www.hctr.be.cua.edu/kirtley
http://www.hctr.be.cua.edu/RERC

Clinical Gait Analysis: http://hctr.be.cua.edu/cga
Send subscribe/unsubscribe to .....listprocKILLspamspam@spam@info.curtin.edu.au

2000\05\01@160212 by Andrew Kunz

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I used the Atmel Serial DataFlash ATD041 (?) on a project.  As it can store
several megabytes, you would be able to handle longer durations between
offloads, and/or higher frequency data, and/or bigger sample sizes (ie, go from
an 8-bit to 10-bit ADC).

I use it to store 16-byte records at 10 Hz and get 45 minutes worth of data.

Andy











"Dr. Chris Kirtley" <kirtleyspamKILLspamCUA.EDU> on 05/01/2000 03:51:35 PM

Please respond to pic microcontroller discussion list <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>








To:      EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU

cc:      (bcc: Andrew Kunz/TDI_NOTES)



Subject: Re: Miniature Data Loggers








Dear all,

Sorry for forgetting to change the title on my posts about the miniature
insole datalogger.

I am keen to find a nice solution for this, because I think I could use
it on several other projects in biomedical engineering.

I'm starting to understand the problems, and the most important would
seem to be memory constraints. Ideally, I'd like to be able to record
for a
whole day from, say, 4 sensors. The logger could turn off when there's
no
activity, so in all this might mean only around one hour of data. At 25
Hz, I make this 25x4x60x60 = 360k. So maybe I could get by with 256k if
I'm
clever - what do you think?

Power, as you say is also a potential problem. I was thinking in terms
of a lithium button cell, but the ideas about using piezo or kinetic
power
generation is certainly worth pursuing - thanks.

Alice suggested using an 8-pin 12c5xx with built-in
ADC, and an antenna printed onto the circuit board with inductive
pickup for downloading. 1 data line, 1 dump switch, 3 lines to control
memory chip.  total program size 600 bytes, onboard rc clock.

This sounds great! What do people think?

TIA,

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 131 (office 105b)
Catholic University of America
Cardinal Station   (or 620 Michigan Ave NE)
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4499
Email: kirtleyspamspam_OUTcua.edu
http://www.hctr.be.cua.edu/kirtley
http://www.hctr.be.cua.edu/RERC

Clinical Gait Analysis: http://hctr.be.cua.edu/cga
Send subscribe/unsubscribe to @spam@listprocKILLspamspaminfo.curtin.edu.au

2000\05\02@122816 by Mark Willis

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AT45D041 there, Andy, I'd bet =)  They make far larger ones now, also.
Some of the latest are 3.3V (iirc) though.

 Mark

Andrew Kunz wrote:
> I used the Atmel Serial DataFlash ATD041 (?) on a project.  As it can store
<snipped>

2000\05\02@123220 by Andrew Kunz

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They have 5V ones, too.  Easier to interface.

Andy









Mark Willis <KILLspammwillisKILLspamspamFOXINTERNET.NET> on 05/02/2000 12:27:22 PM

Please respond to pic microcontroller discussion list <RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU>








To:      spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU

cc:      (bcc: Andrew Kunz/TDI_NOTES)



Subject: Re: Miniature Data Loggers








AT45D041 there, Andy, I'd bet =)  They make far larger ones now, also.
Some of the latest are 3.3V (iirc) though.

 Mark

Andrew Kunz wrote:
> I used the Atmel Serial DataFlash ATD041 (?) on a project.  As it can store
<snipped>

2000\05\02@130750 by Mark Willis

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Definitely - Just something to be aware of. The largest 5.0V part is the
AT45D161 (16Mbit), their largest 2.7V part is the AT45DB321 (32Mbit),
twice as large.

 Mark

Andrew Kunz wrote:
{Quote hidden}

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