--- In "imthemoonman" <> wrote:
>
> Is it possible to hook the microphone up to the ADC on my TS-7250 and then us
> the ADC example code to get some results? I'm planning on sending my heart
> beat into the microphone and then calculate a heart rate. Here's what I'm
> thinking:
> 1. Hook the microphone lead line to ADC channel 0 and the group line to
> ground on the ADC. I might have to add some resistors to make the voltage
> correct?
> 2. Run the example code to see if I get any results. It should work?
> 3. Change the code for what I need.
>
> Any suggestions/reassurance is greatly appreciated.
>
You will get a hell of a lot of spurious high frequency data and a lot of d.p.
to do to extract something useful from a sound recording of your heart.
It may be better to look at another analogue proxy of blood flow or at least
some simple buffer/filter op amp cct on the mike.
Some simple heart rate monitors use a light on your finger tip (like a torch
makes you finger glow red). The light tranmitted varies with the blood flow and
you can pick up a clean slow moving signal with an opto sensor. this may be
more use than trying to detect the envelop of an audio frequency AC input.
If you are talking about the std ADC on the TS boards be very careful not to
exeed 3V. These inputs on-chip inputs of the EP9203 . If you get too careless
you could blow the whole thing. At the very least it's easy to take out the
input permanently.
Keep us posted, I thought of doing this myself at one time.
HTH
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