ETF WSN Testbed: Practical Health Enhancing Application of Wireless Sensor Networks - Application and Multidisciplinary Aspects of Wireless Sensor Networks - page 249

Server

Nodes Internet

USB

IEEE 802.15.4

Base station

Fig. 12.4 Interactive Street Sensing (ISS) architecture

Fig. 12.5 ISS software tiers

Sensor nodes are Sun SPOT devices equipped with a number of sensors. These
nodes are capable of gathering relevant sensor data from the environment and trans-
ferring the information to the base station (via 802.15.4 link).
The base station, a Sun SPOT without the sensor board, is attached to server
(host machine) through USB connection. This device is used for data transfer from
nodes to the server. The server component maintains a database in which collected
information is stored, offers an appropriate graphical interface, and integrates the
whole ISS sensor infrastructure with Internet.

12.2.2 ISS Software

ISS software is divided into three different tiers (Fig. 12.5 ):

• Sensor node tier

• Base station tier

• Server tier