thank u for your reply, my sensor which m planning to design is that it consists of IR LED as source of light and a match photo transistor will be used for detecting the light. The sensor and the transmitter will be in the reflective mode in the probe. The photo sensor will detect the light, which will be back scattered from the tissue of the skin. its basically a finger sensor.
Can u direct me further. i m unable to understand how to use microcontroller for counting of heartbeat. i need the codes for it of 8051 µc