Infrared Heart Pulse Monitor

Posted on Nov 6, 2012

Senses heart pulse by means of an infrared earlobe clip. 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.

Infrared Heart Pulse Monitor
Click here to download the full size of the above Circuit.

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