[Sugar-devel] Pulse Sensor: an Open Source Heart-rate Sensor that Rocks by Yury Gitman ? Kickstarter
quozl at laptop.org
Wed Jul 20 00:50:00 EDT 2011
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:
Not really. That page only describes how to connect sensors, not
whether sensors are suitable, nor whether they will cause damage.
is far more relevant.
But still, without knowledge of the sensor output, we can but speculate.
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