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How is Heart beat counter working?


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theasus



Joined: 06 Jun 2009
Posts: 26


Post05 Nov 2009 18:27   

How is Heart beat counter working?


I couldn't understand this circuit's operating.
Could you help me about this circuit details?
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Post05 Nov 2009 18:27   

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theasus



Joined: 06 Jun 2009
Posts: 26


Post07 Nov 2009 18:16   

Re: How is Heart beat counter working?


Is there anyone to answer my question??
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Katak



Joined: 26 Aug 2009
Posts: 7


Post11 Nov 2009 2:50   

Re: How is Heart beat counter working?


what l can see, you are using LM358 which is a Low Power Dual Operational Amplifiers. due to the very small voltages/signals received from the photosensor (the one under the finger), it need to be amplified significantly before proceed to the next stage.

it looks like Photoplethysmography (PPG) to me..
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