Abstract
The present study proposes a portable patient monitoring system that combines PDA and wireless communication technology to obtain biological signals from subjects without any constraints. It has two types of transmission mode, which are total signal transmission mode and HR (heart rate)/SC (step count) transmission mode. The developed system uses Zigbee wireless PAN, which can be operated in low-power mode. It is composed of a receiver and a transmitter. The transmitter has three-axial acceleration sensor, ECG amplifier and Zigbee communication controller. In total signal transmission mode, it can send data 60 packets per second whose transmission speed corresponds to 300 ECG samples and 60 acceleration samples. In HR/SC transmission mode, it can calculate heart rate from ECG data with 216 samples per second and step count from acceleration data and send a packet every cardiac cycle. The receiver forwards the received data to PDA, where the data can be stored and displayed. The developed equipment showed the possibility of real-time monitoring of the elderly or the disabled in their daily life and is expected to contribute to the saving of medical expenses.
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