29 May
2008
29 May
'08
3:23 p.m.
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.
Martin