Desenvolvimento de um eletrocardiógrafo de baixo custo utilizando um microcomputador Raspberry PI

Abstract

This study presents the development of a portable electrocardiograph, that is able to capture the electrical signals of the human heart activity and show them through an interface. This project includes the development of an electronic circuit that, through three electrodes connected on the left and right arms and the patient’s right leg, captures the electrical potentials arising from the contraction and relaxation of the heart, in accordance with the derivation DI, and amplifies them using an instrumentation amplifier. The graphical user interface (GUI) was implemented using a Raspberry Pi B+ microcomputer and the codes were developed in Python programming language. The GUI displays the heart’s signal on a screen, only one channel at a time, in real time, before being filtered. These data are stored and then processed through the software GNU Octave. It’s used a set of pins of the Raspberry’s general purpose input output (GPIO) to communicate via serial peripheral interface (SPI) bus between analog to digital converter (ADC) and the RPI.