<div>Wow that's a neat design but a hefty price point for something that should only cost $15...</div><a href="http://olpcgoldenstate.blogspot.com/">http://olpcgoldenstate.blogspot.com/</a><div>See above link for background on a reference design that I built for the OLPC and would be happy to share with anyone...</div>
<div>I've got reference design for a similar LED sensor or an actual Electrode-based sensor. </div><div>Let me know...</div><div><br></div><div><a href="mailto:tom.boonsiri@gmail.com">tom.boonsiri@gmail.com</a><br><div>
<br><br><div class="gmail_quote">On Wed, Jul 20, 2011 at 12:00 PM, <span dir="ltr"><<a href="mailto:health-request@lists.laptop.org">health-request@lists.laptop.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Send Health mailing list submissions to<br>
<a href="mailto:health@lists.laptop.org">health@lists.laptop.org</a><br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="http://lists.laptop.org/listinfo/health" target="_blank">http://lists.laptop.org/listinfo/health</a><br>
or, via email, send a message with subject or body 'help' to<br>
<a href="mailto:health-request@lists.laptop.org">health-request@lists.laptop.org</a><br>
<br>
You can reach the person managing the list at<br>
<a href="mailto:health-owner@lists.laptop.org">health-owner@lists.laptop.org</a><br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than "Re: Contents of Health digest..."<br>
<br>
<br>
Today's Topics:<br>
<br>
1. Re: [Sugar-devel] Pulse Sensor: an Open Source Heart-rate<br>
Sensor that Rocks by Yury Gitman ? Kickstarter (James Cameron)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Wed, 20 Jul 2011 14:50:00 +1000<br>
From: James Cameron <<a href="mailto:quozl@laptop.org">quozl@laptop.org</a>><br>
To: Sameer Verma <<a href="mailto:sverma@sfsu.edu">sverma@sfsu.edu</a>>, OLPC Health list<br>
<<a href="mailto:health@lists.laptop.org">health@lists.laptop.org</a>>, "Devel's in the Details"<br>
<<a href="mailto:devel@lists.laptop.org">devel@lists.laptop.org</a>>, Sugar-dev Devel<br>
<<a href="mailto:sugar-devel@lists.sugarlabs.org">sugar-devel@lists.sugarlabs.org</a>><br>
Subject: Re: [Health] [Sugar-devel] Pulse Sensor: an Open Source<br>
Heart-rate Sensor that Rocks by Yury Gitman ? Kickstarter<br>
Message-ID: <<a href="mailto:20110720045000.GB5080@us.netrek.org">20110720045000.GB5080@us.netrek.org</a>><br>
Content-Type: text/plain; charset=us-ascii<br>
<br>
On Wed, Jul 20, 2011 at 12:22:23AM -0400, Kevin Mark wrote:<br>
> On Wed, Jul 20, 2011 at 01:25:31PM +1000, James Cameron wrote:<br>
> > On Tue, Jul 19, 2011 at 08:07:40PM -0700, Sameer Verma wrote:<br>
> > > <a href="http://www.kickstarter.com/projects/1342192419/pulse-sensor-an-open-source-heart-rate-sensor-that" target="_blank">http://www.kickstarter.com/projects/1342192419/pulse-sensor-an-open-source-heart-rate-sensor-that</a><br>
> > ><br>
> > > Minus the Arduino, can this plug into the audio/mic port?<br>
> ><br>
> > That would be a question for the designers. I could not figure it out<br>
> > from the context.<br>
> ><br>
> > I can tell you, based on the Arduino board that is used, and my<br>
> > knowledge of the pinout, that the sensor uses 5V from the board, and a<br>
> > ground, and the signal from the sensor enters one of the Arduino analog<br>
> > inputs. However, the analog inputs can be used for digital data as well<br>
> > as analog data, so this is inconclusive.<br>
> ><br>
> > For the XO, the sensor would require 5V power, perhaps from the USB<br>
> > port.<br>
> ><br>
> > I can't tell if the sensor output is compatible with the microphone<br>
> > input.<br>
> ><br>
> Do you know what kind of voltage that mic input can handle?<br>
> +/5 VDC?<br>
<br>
I can't tell if the sensor output is compatible with the microphone<br>
input, because I don't know if the sensor output is digital or analog.<br>
Sorry for not making that obvious enough.<br>
<br>
But to answer your question literally, the microphone input can handle<br>
from -0.5V to +5.0V DC, beyond which damage will occur unless current is<br>
limited. The useful range is 0.4V to 1.85V for XO-1.<br>
<br>
> this seems like it would be related:<br>
> <a href="http://wiki.laptop.org/go/Making_XO_sensors/How_to_connect_sensors" target="_blank">http://wiki.laptop.org/go/Making_XO_sensors/How_to_connect_sensors</a><br>
<br>
Not really. That page only describes how to connect sensors, not<br>
whether sensors are suitable, nor whether they will cause damage.<br>
<br>
I think<br>
<a href="http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors" target="_blank">http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors</a><br>
is far more relevant.<br>
<br>
But still, without knowledge of the sensor output, we can but speculate.<br>
<br>
--<br>
James Cameron<br>
<a href="http://quozl.linux.org.au/" target="_blank">http://quozl.linux.org.au/</a><br>
<br>
<br>
------------------------------<br>
<br>
_______________________________________________<br>
Health mailing list<br>
<a href="mailto:Health@lists.laptop.org">Health@lists.laptop.org</a><br>
<a href="http://lists.laptop.org/listinfo/health" target="_blank">http://lists.laptop.org/listinfo/health</a><br>
<br>
<br>
End of Health Digest, Vol 31, Issue 2<br>
*************************************<br>
</blockquote></div><br></div></div>