KY-039 Heartbeat Sensor Dector Module



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While sticking a finger between the infrared diode and the phototransistor you can detect the pulse at the signal out. The explanation of the functionality of a phototransistor is simple: It works like a normal transistor - you will detect a higher electricity if the control voltage is higher. Instead of the control voltage, the phototransistor uses the light. If it is a stronger light, you will measure a higher electricity.

  • Pinout Gray: GND
  • Pinout White: +V
  • Pinout Black: Signal