Development of an electronic stethoscope implementing filters with OPAM for the observation of cardiac signals using a graphical interface with an AD8232 module

Abstract

In this article, an investigation was developed in a clinic A low-cost electronic stethoscope has been developed, which utilizes fourth-order active filters and a TL081 operational amplifier preamplifier. It incorporates the AD8232 module for monitoring cardiac signals and features a graphical interface for visualizing these signals. A schematic circuit was designed for a second-order active filter with preamplifiers to compensate for signal attenuation, and electret microphones were used to replace the headphones. The device was implemented using an Arduino development board and a printed circuit board for connecting modules such as the AD8232, DS3231, and MicroSD. The system generates an audible signal through speakers, and the graphical interface facilitates the visualization of the electrical signal captured by the electrodes on the test subject. Data is recorded with date and time thanks to the DS3132 module and stored on the MicroSD module. The objective is to provide an affordable electronic stethoscope with a graphical interface that can be used in both medical clinics and homes during emergencies when access to a hospital electrocardiogram is not always possible. This low-cost solution provides an accessible and reliable tool for monitoring cardiac signals, improving healthcare in various clinical scenarios.