Infrared Heart Pulse Monitor - Senses heart pulse by means of an infrared earlobe clip HOME


Reverse engineered circuit diagram of heart pulse sensor circuit board out of a treadmill. Notice that the output is level shifted for use by CMOS logic running on 4.5V regulated down from the 6V battery. The CMOS logic also controlls the power to the analog circuitry and infrared LED.

Circuit Diagram aka Schematic reverse engineered from circuit board

Here is a picture of the earclip which clips to your earlobe. Infrared light shines through your earlobe and excites the phototransistor.

Supplementary Illustration or Photograph or other Graphic


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Do not experiment with or build any of the above circuits.