[PD] pulse measurement using touch sensors

Martin Peach martin.peach at sympatico.ca
Thu May 29 15:23:08 CEST 2008

Thomas Grill wrote:
> Hi all,
> does anyone have experience with measuring pulse using just hand touch 
> sensors?
> Which kind of sensors are feasible, is there any special signal 
> conditioning necessary?

The basis of commercial pulse sensors is a just red LED and a light 
dependent resistor or a phototransistor. The variation in the blood flow 
changes the amount of red light that passes through the finger. You 
probably need to amplify the signal, then do further signal processing 
(filtering and thresholding) in pd.


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