Michael Rigby-Jones wrote:
> Do you just want to log the time between heart beats (presumably looking
> for maximum time events?), or do you need some ECG data?  If the former
> then could you use one of the IR sensors you clip onto your finger
> rather than sticking probes on the chest?
>   

For now, just a log of time stamped heartbeats may do. I bought one of 
those watch / chest strap packs on the way home yesterday (AU$49). I 
won't need the watch for the logger, but at least it will serve to 
confirm output from the strap.

There's a couple of circuits on the 'net for picking up the pulses from 
the strap. Maybe that coupled with a serial link to an EEPC will do for 
initial testing. I can whip up a small logging app in Dephi way faster 
than the required PIC code.

I had thought about the finger (optical) sensors. I'm not sure if you 
can buy them cheaply. A DIY sensor that would stay on overnight may be 
hard to make.
David...

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David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: www.audiovisualdevices.com.au
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