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'[PIC]: Biometric sensors'
2001\03\29@164517 by Ellen Spertus

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Does anyone know anything about sensors of biometric/medical information
that can be connected to a PIC to measure heart rate, body temperature,
etc.?

Ellen Spertus
spam_OUTspertusTakeThisOuTspammills.edu

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2001\03\29@165658 by t F. Touchton

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part 1 1515 bytes content-type:text/plain; charset=us-asciiunfortunately, I do.  What exactly do you wish to measure?

Might make sense to move this to [EE]: since it will become mostly an analog
discussion.


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Does anyone know anything about sensors of biometric/medical information
that can be connected to a PIC to measure heart rate, body temperature,
etc.?

Ellen Spertus
spertusspamKILLspammills.edu

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part 2 2028 bytes content-type:application/octet-stream; (decode)

part 3 144 bytes
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2001\03\29@170712 by Jinx

face picon face
> Does anyone know anything about sensors of biometric/medical
> information that can be connected to a PIC to measure heart rate,
> body temperature, etc.?

Pulse rate, GSR (galvanic skin response) and temperature sensors
are quite easy too make. Sensors to measure more subtle effects
such as muscle or neuro- functions need more sohisticated circuits
because of the lower voltages to be measured. Pulse rate has
been a topic before, you'll find discussions in the archives

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2001\03\30@134201 by rad0

picon face
just wondering if any of you know how the
heart monitor works on a stairmaster?

it looks like two metals bands going around the
hand grip, no idea how this works...thanks


anybody 'hacked'into the computer on  a stairmaster??

I was thinking of accessing it and hooking up an rf txmitter ...thanks




{Original Message removed}

2001\03\30@141305 by John Waters

picon face
I have a certain degree of humpback, only when someone reminds me will I
aware to straighten my back intentionally. I've tried some correctional
waistcoat that made me feel uncomfortable when my back was bent, this would
remind me not to hump. But I want to do it a more high-tech way. I wonder if
there is any Biometric sensors that will detect the curvature of the spine,
so that I can build a device to warn myself when my back is curved, or I can
even log the frequency I received the warning for reference.

>just wondering if any of you know how the
>heart monitor works on a stairmaster?
>
>it looks like two metals bands going around the
>hand grip, no idea how this works...thanks

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2001\03\30@145914 by Ron Hackett

picon face
A bend sensor would be perfect for your purpose, but I have never seen one
longer than 4 or 5 inches.  I suppose you could use 2 or three of them in a
row.  Shouldn't be difficult to monitor them with a PIC and some sort of
simple output (a vibrating pager motor would be nice and private!).

Ron


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2001\03\30@160117 by Spehro Pefhany

picon face
At 02:59 PM 3/30/01 -0500, you wrote:
>A bend sensor would be perfect for your purpose, but I have never seen one
>longer than 4 or 5 inches.  I suppose you could use 2 or three of them in a
>row.  Shouldn't be difficult to monitor them with a PIC and some sort of
>simple output (a vibrating pager motor would be nice and private!).

Perhaps like these secretive folks?

http://www.spinalsensor.com/

"The Spinal Sensor tm posture trainer is a discreet lightweight
electronic device that monitors the wearer's spinal curvature and
gives real-time feedback (a gentle vibration) when their posture
needs correction."

Best regards,

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2001\03\30@172718 by Olin Lathrop

face picon face
> just wondering if any of you know how the
> heart monitor works on a stairmaster?
>
> it looks like two metals bands going around the
> hand grip, no idea how this works...thanks
>
>
> anybody 'hacked'into the computer on  a stairmaster??
>
> I was thinking of accessing it and hooking up an rf txmitter ...thanks

This may not be what you are looking for, but you can already get heart
monitors that transmit.  They are worn around the chest and the receiver is
a special wrist watch that can display the heart rate.  Two manufacturers I
know of are Polar and Sports Instruments.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, KILLspamolinKILLspamspamembedinc.com, http://www.embedinc.com

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2001\03\30@233735 by John Waters

picon face
>A bend sensor would be perfect for your purpose, but I have never seen one
>longer than 4 or 5 inches.  I suppose you could use 2 or three of them in a
>row.  Shouldn't be difficult to monitor them with a PIC and some sort of
>simple output (a vibrating pager motor would be nice and private!).

Where can I buy these bend sensors? Thanks!
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2001\03\31@065314 by Alan B. Pearce

face picon face
>I have a certain degree of humpback, only when someone reminds me will I
>aware to straighten my back intentionally. I've tried some correctional
>waistcoat that made me feel uncomfortable when my back was bent, this would
>remind me not to hump. But I want to do it a more high-tech way. I wonder if
>there is any Biometric sensors that will detect the curvature of the spine,
>so that I can build a device to warn myself when my back is curved, or I can
>even log the frequency I received the warning for reference.

It may be worth trying to use optical fibre. If the fibre is deformed by being
under tension it affects the transmission characteristic. If you could attach
some so it was in line with the spine as you lean forward it may affect the
transmission characteristic enough to be detectable by sending a suitable pulse
up the fibre. It would only need a pulse say once a second, possibly even less
often, so the led need not be a big part of the battery drain.

I believe in Holland the railways use optical fibre in this manner. By attaching
it to the outside of the track (I think that is how they do it) and then sending
a pulse down it they can detect the position of a train by the TDR detection of
the tiny fibre deformation caused by the track movement from the weight of the
train. I imagine the pulses being used are very small with fast rise time, but
for your use it may be worth playing with some fibre (I imagine the plastic sort
used for those "lamp" things that have a splay of them).

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2001\03\31@110644 by Bob Ammerman

picon face
> >I have a certain degree of humpback, only when someone reminds me will I
> >aware to straighten my back intentionally. I've tried some correctional
> >waistcoat that made me feel uncomfortable when my back was bent, this
would
> >remind me not to hump. But I want to do it a more high-tech way. I wonder
if
> >there is any Biometric sensors that will detect the curvature of the
spine,
> >so that I can build a device to warn myself when my back is curved, or I
can
> >even log the frequency I received the warning for reference.
>
> It may be worth trying to use optical fibre. If the fibre is deformed by
being
> under tension it affects the transmission characteristic. If you could
attach
> some so it was in line with the spine as you lean forward it may affect
the
> transmission characteristic enough to be detectable by sending a suitable
pulse
> up the fibre. It would only need a pulse say once a second, possibly even
less
> often, so the led need not be a big part of the battery drain.
>
> I believe in Holland the railways use optical fibre in this manner. By
attaching
> it to the outside of the track (I think that is how they do it) and then
sending
> a pulse down it they can detect the position of a train by the TDR
detection of
> the tiny fibre deformation caused by the track movement from the weight of
the
> train. I imagine the pulses being used are very small with fast rise time,
but
> for your use it may be worth playing with some fibre (I imagine the
plastic sort
> used for those "lamp" things that have a splay of them).

I have a customer that some years ago was researching the possibility of
measuring deformations using this technique. IIRC the results were quite
promising, but the government research grant ran out before they could bring
it to commercial viability.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\03\31@133702 by Dan Michaels
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>> just wondering if any of you know how the
>> heart monitor works on a stairmaster?
>>
>> it looks like two metals bands going around the
>> hand grip, no idea how this works...thanks


If you actually place your hands on metal bands for the
pickup, then it sounds like they are doing a basic form of
EKG. One std hookup is with electrodes on the wrists for
differential pickup, and one on the foot for a gnd ref.
This is similar to what the Polar chest belts do - they
use pickup electrodes on each side of the chest. Regarding
the EKG, the wrists are essentially at the same potential
as the corresponding side of the chest - ie, the heart
dipoles are localized to the center of the body.

A not too complicated differential amp should work for this
sort of protocol, but you have to be careful not to electrocute
yourself when hooking anything electrical to your body -->
meaning some kind of isolation. Also, you would need some good
bandpass filters to exclude muscle and movement artifacts.

- dan michaels
http://www.oricomtech.com
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'[PIC]: Biometric sensors'
2001\04\02@073703 by Barry King
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>I have a certain degree of humpback, only when someone reminds me will I
....

Perhaps a piece of surgical-rubber-tubing with one end blocked and
the a pressure sensor at the other end.  Pressurize slightly, perhaps
5 psig, then look for a pressure rise when the tubing is bent?

FWIW.

-Barry.
------------
Barry King
NRG Systems "Measuring the Wind's Energy"
http://www.nrgsystems.com
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2001\04\02@094729 by James R. Cunningham

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What about Kynar film?

Barry King wrote:

> >I have a certain degree of humpback, only when someone reminds me will I
> ....

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