Desenvolvimento de um sistema eletropneumático autoajustável acionado por microcontrolador para controle de pressão em colchões

Abstract

In this report, we describe a microcontrolled electropneumatic system developed for pressure control in air mattresses used for ulcer pressures prevention. A pressure ulcer is a wound located in the skin and/or nearby tissue, usually next to a bone prominence, as the result of pressure generated by the body weight being applied for long periods of time, friction, shear or the combination of these factors. For developing the electronic system, components such as PIC16F877A microcontroller, ATX power supply, relay modules, and a MPX5010DP pressure sensor were used. For developing the electropneumatic system, were used, as components, 12 V continuous current solenoid valves, a 127 V alternating current air compressor and a 0-300 mmHg aneroid pressure gauge. The proposed system was able to control the pressure inside the mattresses, keeping it in the limits established by health care professionals, between 12 mmHg and 35 mmHg, and also it is able to execute dynamic control patterns, changing the spots where the body is being supported.