Miniaturized low cost wireless data logger for vibration recording of physiological activities

This paper presents the development and testing of new Wireless sensor telemetry system designed specifically to be mounted on different parts of the body and record useful motion signals. In this work, a miniaturized USB packaged Wireless data-logger was constructed by a low-power System-on-chip device (CC1111) utilizing 433 MHz ISM transceiver to record body accelerations from multiple sites. The wireless setups reduce the inconvenience for free-moving due to the line connection between sensors and the central data processing recorder. The proposed system is measuring acceleration of range from ±2g to ±16g. To enhance the desired performance, the system is provided with Antenna fault and free-fall detection features. The recorded vibration signals were demonstrated in our experiments, while the subjects performed a series physical moving activities, free-moving, simulated falls and postural changes. In this system, a secure digital MicroSD flash was used to store measured acceleration providing extra data storage.