do it yourself ekg

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skrallman
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do it yourself ekg

Post by skrallman » Wed Apr 09, 2003 8:25 pm

The June 2000 issue of Scientific american had an article about a do it yourself EKG. Has anyone built this circuit? I've built the circuit, but would like to compare notes with someone.
Scott

skrallman
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Re: do it yourself ekg

Post by skrallman » Wed Apr 09, 2003 8:27 pm

In case anyone wants to read about it:<p>http://www.sciam.com/article.cfm?colID= ... 9EC588EF21

samsmiles
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Re: do it yourself ekg

Post by samsmiles » Sun Apr 13, 2003 3:59 pm

Hi Scott,
Im working on ekg too. Im studying op.amps at the moment and reading Prof. Websters Medical Instrumentation book. I have made ekg panel with Labview with last years class op amps etc.
Now Im trying to do it all on my own with atmel microcontroller etc. Im biology major weak on EE and Im having quite hard time with this. Want to make it my final next year. But will see.<p>Good luck with your project! Looking forward to hear your progress. Btw I have same multimiter you were buying and its totally good enough for me, 0 problems..<p>Best regards, Sam

skrallman
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Re: do it yourself ekg

Post by skrallman » Thu Apr 17, 2003 11:31 am

Hi Sam,
I'm not an EE either. I'm a civil/environmental engr., but I like to tinker.
Labview is a data logging software, isn't it?
I tried to view my ekc signal on my oscilloscope, but it doesn't work very well. I think the problem is that I can't adjust the time scale to be slow enough. I think a data logger is what I need.
I see you have a post about a max186. Are you trying to build a data logger?

samsmiles
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Re: do it yourself ekg

Post by samsmiles » Tue Apr 22, 2003 4:40 am

Hi Scott,
labview is data acq. and analysis software. Great one. I
have student edition and I love it. But this time
I decided to do it "old way" ie programming it
all on my own. I am using atmels mic 90s4433.
I wired programmer and starter kit board.
Im studying data acqusition with it via maxim 186
at the moment.<p>You should have no problems using oscilloscope
to view ekg. Im sure you have done it by now (Im late with reply sorry). But here is way I do it:
I always turn oscilloscope on first..
I have Coupling=AC
BW limit on (20MHZ), Probe=1X, Invert=Off
volts/div 500 mV
horizontal: 250 ms
triggering: edge, slope=rising, source=ch1, Coupling=AC
Mode=Auto
and then I turn on amplifier and it works for me.<p>Have a great day. Sam<p>[ April 22, 2003: Message edited by: Sam Smiles ]</p>

skrallman
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Re: do it yourself ekg

Post by skrallman » Wed Apr 23, 2003 7:41 am

Thanks Sam. I'll give that a try. My scope is an old surplus unit, that may be problem. I do see the EKG trace, but it happens too fast to study it.
Is the student version a of LabView the same as their free evaluation version? I've been to their web site, but its a 91.5MB download !
Do you have a LabView DAQ board too, our did you build something yourself?
Scott

SmallWorld
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Re: do it yourself ekg

Post by SmallWorld » Wed Apr 23, 2003 10:37 am

For data logging, you might want to check out Labjack (www.labjack.com). It has 8 ADCs, 2 DACs, 16 DIO, a 5V output, a screw terminal interface and connects to the USB of your computer (draws its power from the USB also). It's small and easy to use, and you can control it using almost any software including Labview, Visial Basic, Matlab, etc. They also supply some basic data recording software with it.<p>It can collect data at about 100 Hz, or at 2kHz in burst mode.<p>Since I've started using this board, I've stopped using almost every other data card for slow speed data acquisition (i.e., data logging).<p>It's a great way to make your own USB gizmo.<p>(No I don't work for Labjack, but I'm quite impressed with the product.)

greg123
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Re: do it yourself ekg

Post by greg123 » Wed Apr 23, 2003 11:09 am

riginally posted by scottK:
The June 2000 issue of Scientific american had an article about a do it yourself EKG. Has anyone built this circuit? I've built the circuit, but would like to compare notes with someone.
Scott
web page

samsmiles
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Re: do it yourself ekg

Post by samsmiles » Wed Apr 23, 2003 3:32 pm

Hi everyone,
to Scott: sorry I dont know what/if any the diff is between trial and
student version. I do have NI daq board at school but at home I made
my own daq with with at90s4433, max186 and max 521. <p>To Smallworld: Max 186 is faster than
labjack and it is 12 bit. I connect it via serial port and use parallel for
mic programming. I got half of my „home lab“ equipment for the
price of 119. Cant afford labjack on my student budget(just spent bunch on my
bench power supply). :-)<p>Plus comparing with my colleagues labjack results my home made
version works just fine and I learned a lot wiring all this together.
My system works with matlab and labview as well.
I program it in C howerver using freeware CodevisionAVR C version light used for noncom. purp.<p>To Greg: About original post: no I never wired scientific am. Version, sorry. Will put it
On todo list and do it after finals. :-).<p>Best regards to everyone.
Samuel

samsmiles
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Re: do it yourself ekg

Post by samsmiles » Wed Apr 23, 2003 3:59 pm

Limits of Labview student edition.
For scott:<p>
What are the differences between LabVIEW Student Edition 6i version and LabVIEW 6i Full Development System (FDS)?
The LabVIEW Student Edition does NOT handle: <p>
The ability to integrate external code with LabVIEW (i.e. CIN or DLL).
The ability to use the ActiveX container feature in LabVIEW.
The ability to create a stand-alone executable using Application Builder. <p>Take care. Sam
PS good luck with download.

skrallman
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Re: do it yourself ekg

Post by skrallman » Wed Apr 23, 2003 7:50 pm

Thanks SmallWorld. I did check out LabJack, but like Sam, its more than I want to spend. However, you got me looking around and I found another product by Dataq: 10 bit, 4 channel, +-10v and 240 samples/sec, and software for $25. Not as versatile, but sounds good for the price.<p>Sam, whats the sampling rate of your system using the max186?<p>I'm going get back to playing around with my ekg tonight. Applying those electrodes and then having to rip them off is definately adversion therapy! <p>Scott

samsmiles
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Re: do it yourself ekg

Post by samsmiles » Thu Apr 24, 2003 1:07 am

HI Scott,
its 10-100kS/sec...way above ekg needs.
Hope you had fun with your project last night.<p>Sam

samsmiles
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Re: do it yourself ekg

Post by samsmiles » Thu Apr 24, 2003 1:13 am


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