The document discusses a wireless sensor network project that involves collecting sensor data from nodes in the network. It describes the architecture of the sensor nodes and how they communicate with a base station. The project involves nodes sensing data, storing it locally, and aggregating it before the base station fetches and displays the results. The nodes use Zigbee networking and MSP430 microcontrollers to sense temperature and other environmental data. Future work includes improving data aggregation and displaying results on smartphones.

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.