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Heartbeat sensor
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Heartbeat sensor

by slick on Tue Sep 15, 2009 11:46 pm

Does anyone know what type of sensors are used in heart rate monitors to detect heart beats? I've seen some designs that use a high intensity LED and LDR to be used with a finger. I'm more curious to find out what sensor is used to detect the electrical signals from the heart itself.
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Re: Heartbeat sensor

by zener on Wed Sep 16, 2009 12:32 am


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Re: Heartbeat sensor

by trialex on Wed Sep 16, 2009 12:33 am

The most reliable way is to buy an after-market chest strap http://www.polar.fi/en/products/accessories/T31_coded_transmitter

And use the interface available from sparkfun http://www.sparkfun.com/commerce/product_info.php?products_id=8661 (bare module available too http://www.sparkfun.com/commerce/product_info.php?products_id=8660.

Not cheap, but way more accurate than any DIY solution I've seen.
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