APEC Youth Scientist Journal Vol. 8, No. 1, February 2016, pp. 44~47 http://www.sigs.or.kr ISSN 2005-5625(Online) Low-Cost Photoplethysmographic Circuit for Heart Rate Measurement Reisha Claffel Z. Ferraren* and Lindly Van S. Medrano Philippine Science High School - Central Visayas Campus, Talaytay, Argao, Cebu, Philippines (Received December 19, 2015 : Revised March 12, 2016 : Accepted March 15, 2016) ABSTRACT: Heart rate measurement helps in assessing the condition of the cardiovascular system. Today, there are many other methods to measure heart rates such as Phonocardiogram, ECG, blood pres- sure wave form, and pulse meters but these methods are clinical and expensive. Because of these, a need exists for cheap sensing devices that can measure pulse in an accurate but much easier way. In this study, a low-cost photoplethysmographic circuit was fabricated with the use of LM358 Operational Amplifier, photo- diode, infrared LED, resistors, and potentiometers. The heartbeats per minute of five volunteers were recorded. Three trials were done per volunteer. Data showed that the average heartbeats per minute for the five volunteers with standard deviations are 67.33 ± 1.53, 63.00 ± 2.00, 65.67 ± 2.52, 70.33 ± 1.53, and 65.33 ± 1.53 respectively. The fabricated circuit successfully measured the heart rates of five people. The experiment established the potential of low-cost do-it-yourself photoplethysmographic circuits as alterna- tives to the expensive medical heart rate devices currently being used in hospitals and clinics. Key words: photoplethysmographic, pulse, heart, rate INTRODUCTION Background of the Study Heart rate indicates the soundness of our heart and helps assessing the condition of cardiovascular system (Landaeta et al., 2006). The recording of the pulses of blood vessels in human beings or electro- cardiograms has been an integral part of medicine to both doctors and researchers since its inception. A thorough understanding of the physiology and properties of blood vessels can provide a framework for understanding the nature of pulses (http://www.aub.edu.lb/fea/ece/research/Documents/Report/fyp_0506/ 6_Report.pdf). Pulse measurement can be achieved by using specialized medical devices, or by merely pressing one's fingers against an artery, typically on the wrist or the neck. It is generally accepted that listening to heartbeats using a stethoscope, a process known as auscultation, is a more accurate method to measure the heart rate. There are many other methods to measure heart rates like Phonocardiogram, ECG, blood pressure wave form, and pulse meters but these methods are clinical and expensive (Hashem et al., n.d.). Low-cost devices in the form of wrist watches are also available for the instantaneous measurement of the heart rate. Such devices can give accurate measurements but their cost is usually in excess of several hundred dollars, making them uneconomical (Ibrahim and Buruncuk, n.d.). Because of the aforementioned problems, a need exists for a low-cost sensing device that can measure pulse in an accurate but much easier way. In this study, a photoplethysmographic circuit board, which consists of a LM358 Operational Amplifier, photodiode, infrared LED, resistors, and potentiometers, was fabricated to measure the heart rate of a person from his or her finger. *E-mail: [email protected]
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APEC Youth Scientist Journal Vol. 8, No. 1, February 2016, pp. 44~47
http://www.sigs.or.kr
ISSN 2005-5625(Online)
Low-Cost Photoplethysmographic Circuit for Heart Rate
Measurement
Reisha Claffel Z. Ferraren* and Lindly Van S. Medrano
Philippine Science High School - Central Visayas Campus, Talaytay, Argao, Cebu, Philippines
(Received December 19, 2015 : Revised March 12, 2016 : Accepted March 15, 2016)
ABSTRACT: Heart rate measurement helps in assessing the condition of the cardiovascular system.
Today, there are many other methods to measure heart rates such as Phonocardiogram, ECG, blood pres-
sure wave form, and pulse meters but these methods are clinical and expensive. Because of these, a need
exists for cheap sensing devices that can measure pulse in an accurate but much easier way. In this study, a
low-cost photoplethysmographic circuit was fabricated with the use of LM358 Operational Amplifier, photo-
diode, infrared LED, resistors, and potentiometers. The heartbeats per minute of five volunteers were
recorded. Three trials were done per volunteer. Data showed that the average heartbeats per minute for the
five volunteers with standard deviations are 67.33 ± 1.53, 63.00 ± 2.00, 65.67 ± 2.52, 70.33 ± 1.53, and
65.33 ± 1.53 respectively. The fabricated circuit successfully measured the heart rates of five people. The
experiment established the potential of low-cost do-it-yourself photoplethysmographic circuits as alterna-
tives to the expensive medical heart rate devices currently being used in hospitals and clinics.