Finger Detect Heart Beat Module
Ky-039 is a Low cost Heart beat Sensing Module. This Heart beat detection module uses bright infrared (ir) led and a photo-transistor to detect the pulse of the finger, a red led flashes with each pulse. Pulse monitor works as follows: the led is Turned ON on one side of the finger, and photo-transistor is on the other side of the finger. The photo-transistor used to obtain the flux emitted, when the blood flows through the finger then the resistance of the photo-transistor will be vary slightly.