paper 150206124815

Abstract

The presented study is dedicated to a mobile recorder designed to keep log of electric activity of the heart and incorporated into the expert system developed to detect fatigue status of a patient. The newly designed recorder has a modular structure and its enclosure houses two double-sided printed circuit boards (PCBs), separately for the analog part (BtECG) and the digital one (BtECGradio). The analog module is responsible for measurement of electric signals received from the patients’ body with their further amplification, filtration and conversion to digital form. In addition, in comprises a source of stabilized voltages for both analog and digital circuits. The digital module receives binary data, extracts its useful portion, carries out formatting of the data to form of frames required for RF communication according to the Bluetooth standard and enables wireless communication with a collaborating unit. The analog subassembly is meant to record electric potentials within the range from 0.2 to 2 mV and owing to the high level of the CMRR factor it substantially eliminates the common-mode signals. Furthermore, it enables two-stage amplification, filtration of high-frequency interferences, high- pass filtration and active, five-staged low-pass filtration. The digital module of the recorder enables RF data transmission according to the Bluetooth 4.0 standard, communication with a host unit with use of the UART and SPI interfaces (reading of RF packages from the CPU module) as well as communication with a host unit with use of the Full Speed USB 2.0 (BGAPI) protocol. Its power consumption is ultra low and the communication sessions is controlled by a microprocessor of the 8051 architecture. The digital module also enables the user to embed own application and to debug them via the CC Debugger Connector link. The base chip for development of the digital module is the BLE112 Bluetooth Smart module from Bluegiga.

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Michal Bernat

Zbigniew Piotrowski