Analysis of Cardiac Frequency on Photoplethysmograph (PPG) Synthesis for Detecting Heart Rate Using Fast Fourier Transform (FFT)

Detection of the heart rate is part of the examination of a person's heart condition by knowing the level of normal heart rate. This research utilizes the Wireless Body Network (WBN) system. This system consists of a pulse sensor as a sensor in detecting a heart rate, Bluetooth as a data transfer medium and a computer as a receiver and graphical viewer of heart rate signals. Pulse sensor as a heart rate sensor works through LEDs that will emit light on parts of the body that have capillary blood vessels. The output of the pulse sensor is a photoplethysmograph (PPG) signal. Through the PPG signal, analysis of cardiac frequency will be carried out using the Fast Fourier Transform (FFT) method. Through the spectrum, we will see the shape of the normal heart rate data pattern and abnormal heart rate data. The object of research is limited to people who do not have heart disease and people who have heart disease. Based on the results of the tests conducted, the dominant frequency value for the heart rate data pattern is in the range 0.683594-0.927734 Hz. With details, for a normal heart rate is 0.732422-0.927734 Hz and an abnormal heart rate is 0.683594-0.78125 Hz.