The KY-039 heartbeat sensor is designed to detect a pulse while a human finger is place between the infrared diode and the photo transistor a red LED flashes with each pulse.. The pulse will be represented on the signal output pin.
This sensor works by using a photo transistor to detect the presence of light, in this case how much light is passing through a finger. When blood moves, the amount of light changes and that change can be detected as a pulse.
The most important is to keep the shield stray light into the phototransistor. For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise.
Package Includes:
1 x Ky-039 Heart Beat Sensor
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