Wireless Sensor Networks-Wireless Networking-Lecture 08 Slides-Computer Science Engineering, Slides of Wireless Networking

Wireless Sensor Networks, Sensor Motes, Sensor Network Applications, Monitoring Spaces, Monitoring Things, Environment Monitoring, Sensor Node, Sensor Mote Requirements, Issues in Sensor Network, Processing and Storage, Sensors, Radios, Tinyos, Advanced Computer Networks, Bhaskaran Raman, Computer Science Engineering, Kameswari Chebrolu, Electrical Engineering, Indian Institute of Technology, Kanpur, India.

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Jan-Apr 2007 CS698T: “Wireless Networks: Principles & Practice”, Bhaskaran Raman, Dept. of CSE, IIT Kanpur Topic 08
CS698T
Wireless Networks:
Principles and Practice
Topic 08
Embedded Wireless Sensors: An Introduction
Bhaskaran Raman,
Department of CSE, IIT Kanpur
http://www.cse.iitk.ac.in/users/braman/courses/wless-spring2007/
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CS698T

Wireless Networks:

Principles and Practice

Topic 08

Embedded Wireless Sensors: An Introduction

Bhaskaran Raman,

Department of CSE, IIT Kanpur

http://www.cse.iitk.ac.in/users/braman/courses/wless-spring2007/

Wireless Sensor Networks

What are sensors?

Why “ wirel ess” sensor “ n etworks”?

What do we need to make a wireless sensor

network node?

– Sensor

– Processing

– Radio

– Memory

– SENSOR MOTE

Wireless Sensor Networks

Trends in semi-conductor technology

– Moore's Law

– More silicon per unit area

– More processing per unit area

– Miniaturization becomes possible

Miniaturization of: computing, radios, sensors

Reference: “ Ov erview of Sensor Networks” ,

D. Culler, D. Estrin, M. Srivastava, IEEE

Computer Aug 2004

Sensor Network Applications

Monitoring space

Monitoring things

Monitoring interaction of things in an

encompassing space

Monitoring Things

Bridge Health

Equipment Maintenance

Medical Diagnostics

Structural monitoring, condition based equipment

maintenance, patient health monitoring/diagnostics

Monitoring Interaction of things

in an encompassing space

Wildlife tracking, disaster management,

manufacturing process flow

Disaster Management

Animal Tracking

The Sensor Node

Source: Overview of Sensor Networks, D. Culler, D.

Estrin, M. Srivastava, IEEE Computer Aug 2004

Some Measurements

Source: Overview of Sensor Networks, D. Culler, D. Estrin, M. Srivastava, IEEE Computer Aug 2004

Issues in Sensor Networks

Routing, data dissemination

– Energy conservation

– Lots of literature in this domain

Localization, time synchronization

Topology, power control

Processing and Storage

Microprocessors:

– 1 mW at about 10MHz speed

– Duty cycle of 1% ==> 10 micro-watts

Memory:

– About 10KB of RAM, 100KB of ROM

Battery:

– Typically about 1AH per cu.cm.

– Solar power: 10mW per sq.cm. outdoors, 0.01-

0.1mW per sq.cm. indoors

– Mechanical vibrations: 0.1 mW

TinyOS

Uses event-driven paradigm for concurrency

Hardware interrupts and software tasks

Tasks: deferred procedure call

– Tasks are maintained in a queue

– Tasks are atomic

System modeled as a set of components

– State + tasks

Components interact via interfaces

– Commands + events