In recent years, wireless sensor network (WSN), as a powerful tool, has been widely applied to structural
health monitoring (SHM) due to its low cost of deployment. Several commercial hardware platforms of
wireless sensor networks (WSN) have been developed and used for structural monitoring applications
[1,2]. A typical design of a node includes a sensor board and a mote connected to it. Sensing units,
analog filters and analog-to-digital converters (ADCs) are integrated on the sensor board and the mote
consists of a microcontroller and a wireless transceiver. Generally, there are a set of sensor boards
compatible with the same model of mote and the selection of the sensor board depends on the specific
applications. A WSN system based on this node lacks the capability of interrupting its scheduled task to
start a higher priority task. This shortcoming is rooted in the hardware architecture of the node. The
proposed sandwich-node architecture is designed to remedy the shortcomings of the existing one for task
preemption. A sandwich node is composed of a sensor board and two motes. The first mote is dedicated
to managing the sensor board and processing acquired data. The second mote controls the first mote via
commands. A prototype has been implemented using Imote2 and verified by an emulation in which one
mote is triggered by a remote base station and then preempts the running task at the other mote for
handling an emergency event.
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