![]() The sensor unit consists of an infrared light-emitting-diode (IR LED) and a photo diode. ![]() With the help of processing software heart rate monitoring and counting is performed. The signal can be amplified and is sent to Arduino with the help of serial port communication. This fluctuation of blood can be detected through an optical sensing mechanism placed around the fingertip. While the heart is beating, it is actually pumping blood throughout the body, and that makes the blood volume inside the finger artery to change too. It is based on the principal of photophelthysmography (PPG) which is non-invasive method of measuring the variation in blood volume in tissue using a light source and detector. This paper describes a technique of measuring the heart rate through a fingertip and Arduino. The pulse can be felt from those areas where the artery is close to the skin. ![]() ![]() It can be measured either by the ECG waveform or by sensing the pulse - the rhythmic expansion and contraction of an artery as blood is forced through it by the regular contractions of the heart. Heart rate is the number of times the heart beats per minute, reflects different physiological conditions such as biological workload, stress at work and concentration on tasks, drowsiness and the active state of the autonomic nervous system. Heart rate is a very vital health parameter that is directly related to the soundness of the human cardiovascular system. Technological innovations in the field of disease prevention and maintenance of patient health have enabled the evolution of fields such as monitoring systems. ![]()
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