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– Basic Introduction to Communication Network
– Basic Network Topologies
– WSN Concept
– A Commercial Sensor Node
– Sensor Network
– Comparision Between a PC and Sensor Mote
– Working of a Sensor Node
– Some Real Time Applications
• A communication network is composed of
nodes, each of which has
transmit and receive messages over
communication links, wireless or cabled.
Basic Network Topologies
Star Topology Ring Topology
Bus Topology Tree Topology
Fully Connected Networks Mesh Networks
Mesh nets can be good models for large-scale
networks of wireless sensors that are
distributed over a geographic region.
Each node consists of
Wireless Sensor Networks are networks that consists of
sensors which are distributed in an ad hoc manner.
These sensors work with each other to sense some physical
phenomenon and then the information gathered is processed to
get relevant results.
A single network may consist of several
interconnected subnets of different
A WSN is a wireless network consisting of
spatially distributed autonomous devices
using sensors to cooperatively monitor
physical or environmental conditions, such
as temperature, sound, vibration, pressure,
motion or pollutants, at different locations.
The flowing of data ends at special nodes
called base stations (sometimes referred to
A base station links the sensor network to
another network (like a gateway) to
disseminate the data sensed for further
Base stations have enhanced capabilities
over simple sensor nodes since they must do
complex data processing.
Base stations have
• workstation/laptop class processors,
• enough memory,
• energy, storage
• computational power
0.5 oz, 2.25 x 1.25 x 0.25
25 lb, 19.5 x 5.5 x 16 inch
~14 mW~ 64 W
~ $35~ $6K (today)
512 KB Flash160 KB Floppies
128 KB RAM16-256 KB RAM
4 MHz4.77 MHz
MICAZ Mote (2005)Original IBM PC (1981)