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biomedical data acquisition

L

litw

Jan 1, 1970
0
Dear group,
I need to make a data acquisition system for collection biomedical data
such as ECG, body temperature, respiration sound etc. The frequency of
the signals are low, basically below 1kHz. I think 12bit of precision is
good enough too. The interface to PC can be rs232 or whatever (bluetooth
a fancier solution?)

I think a low-power microcontroller with 4 ch adc will do the job. Do
you guys have any reommendations? Any information is greatly appreciated!

regards,
 
S

Spehro Pefhany

Jan 1, 1970
0
Dear group,
I need to make a data acquisition system for collection biomedical data
such as ECG, body temperature, respiration sound etc. The frequency of
the signals are low, basically below 1kHz. I think 12bit of precision is
good enough too. The interface to PC can be rs232 or whatever (bluetooth
a fancier solution?)

I think a low-power microcontroller with 4 ch adc will do the job. Do
you guys have any reommendations? Any information is greatly appreciated!

regards,

Check out the TI MSP430 and the 8051 variants from Burr-Brown & AD.

Best regards,
Spehro Pefhany
 
K

Ken Smith

Jan 1, 1970
0
Spehro Pefhany said:
Check out the TI MSP430 and the 8051 variants from Burr-Brown & AD.

Also Cygnal. The debugging stuff is low cost and you can get them from
Digikey.
 
K

Ken Smith

Jan 1, 1970
0
Dear group,
I need to make a data acquisition system for collection biomedical data
such as ECG, body temperature, respiration sound etc. The frequency of
the signals are low, basically below 1kHz. I think 12bit of precision is
good enough too. The interface to PC can be rs232 or whatever (bluetooth
a fancier solution?)

I think a low-power microcontroller with 4 ch adc will do the job. Do
you guys have any reommendations? Any information is greatly appreciated!

Are you just making one? Do you need to carry it around or is it
stationary.

I suggest a PC with a logging program.
 
L

litw

Jan 1, 1970
0
Ken,
Thanks for the suggestion.
I am suprised. 7 years later. I am still looking for 8051 families. :)
Actually I prefer a easily programmable controller with a possible
wireless way for PC connection. Is there a module easily doing that? All
I need to do is to sample 4 ch very slow (0.1Hz up to 50Hz, at most
1kHz) signals and transmit (wirelessly, if not too hard) to a computer.
I am focusing on the analog part so I would like to reduce the
digital/programming work to a minimum.
regards
Tianwei
 
K

Ken Smith

Jan 1, 1970
0
Ken,
Thanks for the suggestion.
I am suprised. 7 years later. I am still looking for 8051 families. :)
Actually I prefer a easily programmable controller with a possible

What could be easier than an 8051 in assembly?
wireless way for PC connection. Is there a module easily doing that? All
I need to do is to sample 4 ch very slow (0.1Hz up to 50Hz, at most
1kHz) signals and transmit (wirelessly, if not too hard) to a computer.

Some 8051 etc micros have example circuits doing infra-red links.

There are devices that appear to be web pages on a network and 802.11 to
consider too.
 
C

Charles Edmondson

Jan 1, 1970
0
litw said:
Ken,
Thanks for the suggestion.
I am suprised. 7 years later. I am still looking for 8051 families. :)
Actually I prefer a easily programmable controller with a possible
wireless way for PC connection. Is there a module easily doing that? All
I need to do is to sample 4 ch very slow (0.1Hz up to 50Hz, at most
1kHz) signals and transmit (wirelessly, if not too hard) to a computer.
I am focusing on the analog part so I would like to reduce the
digital/programming work to a minimum.
regards
Tianwei
Take a look at www.dpactech.com and see what their Airborne series might
do four you. Wi-Fi modules with onboard controllers... :cool:
 
L

litw

Jan 1, 1970
0
Hi Edmonson, Thank you for the reply, I went to that site,
That site mentioned 2.4G 802.11... but why 802.11 after all? I got an
idea: I am going to modify a 2.4G cordless phone!! If I modulate the
slow biomed signals in some (easy?) way to the ~4k standard phone
bandwidth I can do all the tricks on the other end, which will be PC
based LabView stuff. How about this? All analog solution maybe possible.
Tianwei
 
L

litw

Jan 1, 1970
0
IR device maybe not very suitable because it is supposed to be a
wearable thing and the patient may walk around. I don't know how to keep
the ir beam always aligned. The information i want to transmit is really
minimal. I think maybe I can modulate them all into an audio chanel
without a microcontroller. How do you think?
 
R

Rich Grise

Jan 1, 1970
0
Ken,
Thanks for the suggestion.
I am suprised. 7 years later. I am still looking for 8051 families. :)
Actually I prefer a easily programmable controller with a possible
wireless way for PC connection. Is there a module easily doing that? All
I need to do is to sample 4 ch very slow (0.1Hz up to 50Hz, at most
1kHz) signals and transmit (wirelessly, if not too hard) to a computer.
I am focusing on the analog part so I would like to reduce the
digital/programming work to a minimum.
regards
Tianwei

Looking up your requirements, I finally got around to looking up
the Microchip PIC:
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=69

and from a coup[le of other things that showed up, the look like just
the ticket! The 12F675 kind of jumped out at me, with 4x 10-bit ADCs.

Have Fun!
Rich
 
R

Rich Grise

Jan 1, 1970
0
Hi Edmonson, Thank you for the reply, I went to that site,
That site mentioned 2.4G 802.11... but why 802.11 after all? I got an
idea: I am going to modify a 2.4G cordless phone!! If I modulate the
slow biomed signals in some (easy?) way to the ~4k standard phone
bandwidth I can do all the tricks on the other end, which will be PC
based LabView stuff. How about this? All analog solution maybe possible.
Tianwei
You could certainly modulate a 4 KHz carrier with a 50 Hz signal. I
actually heard the telemetry of an EEG monitor once - the frequency
of the tone corresponded to the instant voltage of the signal.
ooooaaaoooweeooooooooooooowaaaaooooweooooo...
 
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