Sensing and feedback stimulation via the wireless ZigBee protocol.

The aim of this work is to implement a feedback sensing and control mechanism via wireless sensor nodes for medical sensing and actuation. To that end, we employ the Zigbee protocol in sensing and precisely commanding an analog signal to a probe. We employ a user application upon the layer available in the Zigbee stack to achieve our goal. Signal transmission delays, packet losses, and energy consumption are major challenges, we present strategies to minimize or solve these challenges. We also introduce strategies to enable sensor nodes to acquire and command (electrical current) signals from/to sensing/actuating platforms. Finally, we implement algorithms allowing the sensor node to compute and to regulate command signal on line.