The microcontroller checks the analog signals whether they are valid or not comparing with a standard voltage. Microcontroller counts the heart rate and displays the result in a LCD display. There exists another approach where infrared Tx and Rx are used. In that system it senses pulses, amplifies the pulses and filters pulses by a low pass filter. Finally, the pulse signal is sent to a microcontroller [9], [10]. The microcontroller also give output comparing with a reference voltage. Both the approaches give inaccurate result in many cases because analog signal of pulse varies from person to person and the approaches fail to calibrate analog signal of pulses for each person