[Health] Health Digest, Vol 31, Issue 2

[Tom Boonsiri]

Wow that's a neat design but a hefty price point for something that should
only cost $15...
http://olpcgoldenstate.blogspot.com/
See above link for background on a reference design that I built for the
OLPC and would be happy to share with anyone...
I've got reference design for a similar LED sensor or an actual
Electrode-based sensor.
Let me know...

tom.boonsiri at gmail.com


On Wed, Jul 20, 2011 at 12:00 PM, <health-request at lists.laptop.org> wrote:

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> Today's Topics:
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>   1. Re: [Sugar-devel] Pulse Sensor: an Open Source Heart-rate
>      Sensor that Rocks by Yury Gitman ? Kickstarter (James Cameron)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 20 Jul 2011 14:50:00 +1000
> From: James Cameron <quozl at laptop.org>
> To: Sameer Verma <sverma at sfsu.edu>, OLPC Health list
>        <health at lists.laptop.org>,      "Devel's in the Details"
>        <devel at lists.laptop.org>,       Sugar-dev Devel
>        <sugar-devel at lists.sugarlabs.org>
> Subject: Re: [Health] [Sugar-devel] Pulse Sensor: an Open Source
>        Heart-rate Sensor that Rocks by Yury Gitman ? Kickstarter
> Message-ID: <20110720045000.GB5080 at us.netrek.org>
> Content-Type: text/plain; charset=us-ascii
>
> On Wed, Jul 20, 2011 at 12:22:23AM -0400, Kevin Mark wrote:
> > On Wed, Jul 20, 2011 at 01:25:31PM +1000, James Cameron wrote:
> > > On Tue, Jul 19, 2011 at 08:07:40PM -0700, Sameer Verma wrote:
> > > >
> http://www.kickstarter.com/projects/1342192419/pulse-sensor-an-open-source-heart-rate-sensor-that
> > > >
> > > > Minus the Arduino, can this plug into the audio/mic port?
> > >
> > > That would be a question for the designers.  I could not figure it out
> > > from the context.
> > >
> > > I can tell you, based on the Arduino board that is used, and my
> > > knowledge of the pinout, that the sensor uses 5V from the board, and a
> > > ground, and the signal from the sensor enters one of the Arduino analog
> > > inputs.  However, the analog inputs can be used for digital data as
> well
> > > as analog data, so this is inconclusive.
> > >
> > > For the XO, the sensor would require 5V power, perhaps from the USB
> > > port.
> > >
> > > I can't tell if the sensor output is compatible with the microphone
> > > input.
> > >
> > Do you know what kind of voltage that mic input can handle?
> > +/5 VDC?
>
> I can't tell if the sensor output is compatible with the microphone
> input, because I don't know if the sensor output is digital or analog.
> Sorry for not making that obvious enough.
>
> But to answer your question literally, the microphone input can handle
> from -0.5V to +5.0V DC, beyond which damage will occur unless current is
> limited.  The useful range is 0.4V to 1.85V for XO-1.
>
> > this seems like it would be related:
> > http://wiki.laptop.org/go/Making_XO_sensors/How_to_connect_sensors
>
> Not really.  That page only describes how to connect sensors, not
> whether sensors are suitable, nor whether they will cause damage.
>
> I think
> http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors
> is far more relevant.
>
> But still, without knowledge of the sensor output, we can but speculate.
>
> --
> James Cameron
> http://quozl.linux.org.au/
>
>
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> End of Health Digest, Vol 31, Issue 2
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