Wireless Logger for Biosignals

Abstract

This work proposed a novel 4-channel wireless data logger that uses electromyogra- phy (EMG), electrocardiograph (EKG), and accelerometer transducers for field measurements of biosignals. The logger, which weighs 102 g (including the battery), continually acquires 4-channel 16-bit analog signals at 1000 Hz/channel. The acquired data are saved on a microSD memory card for subsequent analysis. The logger utilizes a ZigBee transceiver module that transmits acquired data to a remote receiver. The logger can run for over 6 consecutive hours at full load when powered by two 860 mAh batteries. The remote receiver unit, connected to a PC or laptop via a USB interface, was controlled by Window-based monitoring software for com- municating with the logger. The monitoring software programmed by Borland C++ Builder op- erated the logger and monitored real-time data sent from the logger. Three laboratory experi- ments and two prolonged field tests were performed to test logger feasibility. The experimental results demonstrate that the system is reliable and feasible for field measurements of biosignals for a prolonged period.