This is cached copy of http://members.shaw.ca/novotill/IrPulseMonitor/index.htm as retrieved on 03-04-2005 23:50
IR Heart Pulse Monitor. Senses heart pulst through earlobe via an infrared clip
Search index RadioLocman.com - Circuits is not affiliated with the authors of this page nor responsible for its content.

Infrared Heart Pulse Monitor - Senses heart pulst through earlobe via an infrared clip
Reverse engineered circuit diagram of a pulse sensor circuit board out of a treadmill. Notice that the output is level shifted for use by CMOS logic running on 4.5 V regulated down from the 6V battery. The CMOS logic also controlls the power to the analog circuitry and infrared LED. I do not gaurantee the accuracy or safety of any information herein.

Circuit Infrared Heart Pulse Monitor

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

Service Radiolocman.com does not guarantee absolutely exact display of cached page