Data Acquisition System in Wireless Sensor Network.

1. BE PROJECT
Domain : Wireless Sensor Network
Problem statement :Data acquisition scheme for wireless
sensor network

2. Contents
 Introduction
 Architecture of node application structure
 Our project
 Future scope and limitations
 Conclusions

3. What is WSN?
 WSN stands for “Wireless Sensor Network”
 A wireless sensor network consists of three main
components:
1. Nodes
2. Communication
3. Computation
 It consists of a number of nodes deployed at different
locations, that sense their environment and sends the related
data to the Base Station.

4. Categories of WSN
 Category 1:
 Almost invariably mesh-based systems with multi hop
radio connectivity among or between WNs.
 Category 2:
 Point-to-point or multipoint-to-point (star based) systems
generally with single-hop radio connectivity to WNs.

6. Why WSN?
 Self – Organization
 Concurrency processing
 Low cost
 Tiny
 Portable

7. ARCHITECTURE OF NODE APPLICATION STRUCTURE
 Node software has 3 parts
o Operating System which performs device-specific tasks
o Sensor Driver which initializes the sensor hardware and
performs the measurements in the sensor
o Host Middleware which organizes the co- operation of the
distributed nodes in the network
 Individual nodes interact with the distributed middleware
layer to perform the functions dictated by the sensor network
application
 The general overall software architecture of the sensor net is
shown in the figure on next slide.

9. Applications of WSN
 Earthquake / Natural disaster Prevention
 Air pollution Monitoring
 Waste water Monitoring
 Health care Monitoring
 Military Surveillance
 Inventory Tracking
 Industrial Monitoring
 Data Logging

11. Our Project
At Node Level:
 Sensing data.
 Storing it in a secondary memory.
 Data aggregation
At the Base Station(base station is connected to a
computer):
 Fetching the data from the database.
 Displaying the results.

12. Our Project

13. Query based/Event based
nodes
 Query based node sends data to the base station only when
we fire a query to that node from a base station(e.g.
Temperature sensing , humidity sensing etc.)
 Event based node sends data to the base station on the
occurrence of a particular event (e.g. Forest fire , earthquake
etc.)

14. Platform/Technology used
Different Networking Technologies used :
 ZIGBEE
Nodes contains:
 MSP430-Microcontroller
 Secondary Storage/USB slots/Serial ports
 Sensors
 Power Supply

15. Platform/Technology used
 C++
 PHP
 HTML5.

17. Applications
 Temperature sensing

18. Limitations
 Power factors
 Environmental factors
 Transmission channel factors
 Energy efficiency
 Network topology
 Failure in long range communication
 Increase in traffic decreases the lifetime
 Restricted energy resource

19. Future Scope
 Data Aggregation
 To display results on Android smartphones.

20. Conclusion
 Thus, we would be able to store the data sensed by the node
in a secondary storage and can obtain/access the data as and
when required in the future.