Searching \ for '[EE] Heart-Rate-Monitor' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=heart+rate+monitor
Search entire site for: 'Heart-Rate-Monitor'.

Exact match. Not showing close matches.
PICList Thread
'[EE] Heart-Rate-Monitor'
2005\04\07@024644 by Reelf Monsees

flavicon
face
Hi,
I'm thinking of building a receiver for these wireless chest-belt
transmitters. As far as I know they transmit on frequencies around 5 kHz.
Has anyone already build such a receiver ?  What about the maximum
distance between transmitter + receiver ?
Any suggestions ?

regards,
     Reelf

2005\04\07@043641 by Russell McMahon

face
flavicon
face
> I'm thinking of building a receiver for these wireless chest-belt
> transmitters. As far as I know they transmit on frequencies around 5
> kHz.
> Has anyone already build such a receiver ?  What about the maximum
> distance between transmitter + receiver ?


There are a number of circuits on the web.
Google knows where they are.
email me if you don't find anything - too busy just now.

Range is typically 1 metre easily.
2 metres gets rather hard.


       RM

2005\04\08@030733 by liam .

picon face
I'm also interested in these heart rate monitor belts so if you feel
like sharing resources.....



Liam

2005\04\08@055404 by Russell McMahon

face
flavicon
face
> I'm also interested in these heart rate monitor belts so if you feel
> like sharing resources.....

I'll share my best one

       http://www.google.com



       RM

2005\04\08@060105 by liam .

picon face
> I'll share my best one
>
>        http://www.google.com
>


I guessed that one

2005\04\08@060448 by Reelf Monsees

flavicon
face
well, did spend a few hours searching with google. but nothing
that really helped :-(
Reelf

Russell McMahon wrote:
{Quote hidden}

-- SyWiTec *  Systeme für Wissenschaft und Technik
             Bamberg & Monsees GbR
        Am Lesumdeich 7a * D-28719 Bremen
     Fon +49-421-646775 * Fax +49-421-646785
             http://www.sywitec.de/


     SmartKit Electronic  -  Der Online-Shop
            http://www.smartkit.de/

     SmartKit Electronic  -  The Online-Shop
            http://www.smartkit.net/
            http://www.smartkit.org/

2005\04\08@063257 by Russell McMahon

face
flavicon
face
> well, did spend a few hours searching with google. but nothing
> that really helped :-(

Here's something that I originally found with Google

       http://others.servebeer.com/temp/HeartRateMonitor.htm

The original is gone - the now links just take you to massively
spyware infected rubbish pages.

Ask for more a week from now. Gotta fly at present.



       RM

2005\04\08@065023 by Reelf Monsees

flavicon
face
yes, found a lot of links to that one too. but as you said, it's gone.

Reelf

Russell McMahon wrote:
{Quote hidden}

-- SyWiTec *  Systeme für Wissenschaft und Technik
             Bamberg & Monsees GbR
        Am Lesumdeich 7a * D-28719 Bremen
     Fon +49-421-646775 * Fax +49-421-646785
             http://www.sywitec.de/


     SmartKit Electronic  -  Der Online-Shop
            http://www.smartkit.de/

     SmartKit Electronic  -  The Online-Shop
            http://www.smartkit.net/
            http://www.smartkit.org/

2005\04\08@073531 by Mauricio Jancic

flavicon
face
There was a discussion many years ago here in the PICLIST about the same
thing. Try to look in the archives if there is something more than this only
mail I have from Fr. McGahee

Regards,
Mauricio Jancic
Janso Desarrollos - Microchip Consultants Program Member
spam_OUTinfoTakeThisOuTspamjanso.com.ar
http://www.janso.com.ar
(54) 11 - 4542 - 3519

{Original Message removed}

2005\04\08@075820 by Dan

flavicon
face
I found these on Discover Circuits:
http://www.discovercircuits.com/M/medical.htm

and an IR Pulse Monitor here:
http://members.shaw.ca/novotill/IrPulseMonitor/index.htm

Slightly off-topic, but if anyone can share information on how to
electronically determine body fat/body water (aside from computing BMI based
on height/weight) that would be great. As I understand it can be done with a
low voltage frequency, but aside from that I cannot find any sites/examples.

TIA
Dan



{Original Message removed}

2005\04\08@080427 by olin_piclist

face picon face
Is this a commercial project?  If so we can probably help.  I wrote the code
for the heart rate receiver in the Tune (now Graber Products I think)
PowerTap bicycle data logger.  The biggest problem is that there is a lot of
noise on the received signal.  Getting good noise immunity and decent
response at the same time are not trivial.  In the end we got ours to work
just a little better than the wristwatch receiver made by the same company
(Polar?) that made the transmitter.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

2005\04\08@090618 by Russell McMahon

face
flavicon
face
>In the end we got ours to work
> just a little better than the wristwatch receiver made by the same
> company
> (Polar?) that made the transmitter.

What typical range did you achieve ?
1 meter is about maximum normally. 2 metres is a challenge.


       Russell McMahon

2005\04\08@104907 by olin_piclist

face picon face
Russell McMahon wrote:
> What typical range did you achieve ?
> 1 meter is about maximum normally. 2 metres is a challenge.

I sortof remember the limit being around 1/2 to 1 meter.  In our case the
transmitter was on a bicycle rider's chest, and the receiver on the handle
bars.  It worked well enough most of the time, but there were known
locations around the greater Boston area where the heartrate signal would
reliably get lost.  In one case it was determined that strong noise was
eminating from a nearby building.  I a normal bike ride, the rider would
pass thru these areas quickly enough to only loose a beat or two, which our
algorithm was tolerant of.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

2005\04\08@122800 by Scott Dattalo

face
flavicon
face
Olin Lathrop wrote:
> Is this a commercial project?  If so we can probably help.  I wrote the
> code
> for the heart rate receiver in the Tune (now Graber Products I think)
> PowerTap bicycle data logger.  The biggest problem is that there is a
> lot of
> noise on the received signal.  Getting good noise immunity and decent
> response at the same time are not trivial.  In the end we got ours to work
> just a little better than the wristwatch receiver made by the same company
> (Polar?) that made the transmitter.

Hi Olin,

So now I have an inside source for my PowerTap! I find the heart monitor
is reliable except when I ride near power lines or when the strap
battery is low. It turns out that the 'Axiom' product line from
Performance is compatible with PowerTap. So I have a wrist watch
receiver that I can use in conjunction with the PowerTap
handlebar-mounted receiver. The Axiom receiver works over a wider range.
I suspect this may be due to either it being in slightly closer
proximity or that my arm acts as a kind of e-field shield (or maybe it
is just a product variation). When the Axiom fails, the heart rate
reading pegs to some maximum, whereas the PowerTap drops to zero.

Oh and the Polar system is compatible too. I can pick up neighboring
riders' heart rates by simply extending my arm towards them!

Scott

2005\04\08@124637 by Stef Mientki

flavicon
face


Olin Lathrop wrote:

> Is this a commercial project?  If so we can probably help.

If not, ...
...cann't you give the hobbyist some ideas of how to receive the Polar
signals ?

Stef Mientki

2005\04\08@193214 by Russell McMahon

face
flavicon
face
> Here's something that I originally found with Google
>
>        http://others.servebeer.com/temp/HeartRateMonitor.htm
>
> The original is gone - the now links just take you to massively
> spyware infected rubbish pages.

Other pages seem recoverable by Wayback machine.

Here's one to start

       http://web.archive.org/web/*/http://www.ricksunfinishedstuff.com/hrm/index.html

Detail of circuit and notes are there and other stuff should be.


       RM


'[EE] Heart-Rate-Monitor'
2005\11\29@121736 by M. Adam Davis
face picon face
He appears to have placed his webpage on another host:

http://rick.mollprojects.com/hrm/index.html

Would be nice if someone had a simple transister receiver design for
these things...

-Adam

On 4/8/05, Russell McMahon <.....apptechKILLspamspam@spam@paradise.net.nz> wrote:
{Quote hidden}

> -

2005\11\29@143438 by Stef Mientki

flavicon
face


M. Adam Davis wrote:

>He appears to have placed his webpage on another host:
>
>http://rick.mollprojects.com/hrm/index.html
>
>Would be nice if someone had a simple transister receiver design for
>these things...
>  
>
the used opamps contains about 40 .. 100 transistors ;-)

Stef

More... (looser matching)
- Last day of these posts
- In 2005 , 2006 only
- Today
- New search...