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2 WSNs Framework and Sensor Nodes
The sensor network structure of WSNs is composed of sensor node, sink node, and
manager station. The sensor nodes are deployed randomly in the monitoring area with
self-organization to get, transmit and process the monitoring data by multi-hop. The
data is transmitted to the sink node, and finally arrived via the Internet or satellite
management station. Sensor node is usually a micro embedded system, and its proc-
essing power, storage capacity and communication capacity is relatively weak with
limited energy. The processing power, storage capacity and communication capacity
of sink node is relatively strong. It connects the sensor network and Internet and other
external networks, communicates between the two protocol stack protocol conversion,
and releases management node monitoring tasks, and to collect data forwarded to the
external network.
Sensor node include sensing unit, communications unit and processing unit, energy
unit and other components [4], shown in Fig. 1.
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Fig. 1. Structure of sensor node
CC2430/CC2431, firstly produced by TI, is the perfect combination of excellent
performance with the leading CC2420RF transceiver core and an enhanced 8051
controller. CC2430/CC2431 chip with past CC2420 chip architecture, integrate in a
single chip ZigBee radio frequency (RF) front end, memory and microcontroller.
The difference between CC2430/CC2431 is the location tracking engine of
CC2431 and CC2430-free location tracking engine. Fig. 2 (a) shows the wireless
communication module consisting of CC2430 WSNs node hardware chart. Shown in
Fig. 2 (b) is an extension of the network board with a CC2430 module coordinator
communication module.
(a) (b)
Fig. 2.
 
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