Waterwell Midterm Presentation

WaterWell Online Water Quality Management - CSD Fall 2008

WaterWell SolutionOnline Water Quality Managementhttp://www.tslab.ssvl.kth.se/csd/projects/0821006

WaterWell Online Water Quality Management - CSD Fall 2008

1.

STATEMENT

PROBLEM

WaterWell Online Water Quality Management - CSD Fall 2008

Blantyre,Malawi

WaterWell Online Water Quality Management - CSD Fall 2008

Technology vs. Problem

K.O

• WSN• Sensors• Sun SPOTs• Solar Panel

• Automation• Accurate Results

• Wide-Area• Power Source

WaterWell Online Water Quality Management - CSD Fall 2008

PreviousWork

WaterWell Online Water Quality Management - CSD Fall 2008

2.

CONTRIBUTION

UNIQUE

WaterWell Online Water Quality Management - CSD Fall 2008

Reading Serial Data

WaterWell Online Water Quality Management - CSD Fall 2008

Testing The Connection

• Two Java Programs (NetBeans)

– To read data from sensor through serial port, forward to base station and vice versa

– To switch on & off the level converter (Sensor) through H0 pin

WaterWell Online Water Quality Management - CSD Fall 2008

Real-Life

WaterWell Online Water Quality Management - CSD Fall 2008

Consumption3. POWER

WaterWell Online Water Quality Management - CSD Fall 2008

WaterWell System

Host Station• Send HELLO• Synchronization• Configuration• Gathering data

WSN Node

• Reading data from

sensor

• Sending data to base

station

WaterWell Online Water Quality Management - CSD Fall 2008

How does it work ?

WaterWell Online Water Quality Management - CSD Fall 2008

System Diagrams

Sequence Diagram State Transition Diagram

WaterWell Online Water Quality Management - CSD Fall 2008

Power Consumption Issues

• Problems:• Sustainability• Sensors’ Power

• Solutions:• Solar Panel• Wake Up Mechanism• Power Adjustment

WaterWell Online Water Quality Management - CSD Fall 2008

Wake-Up Mechanism

Wake-up Mechanism

Sensor

WaterWell Online Water Quality Management - CSD Fall 2008

Link Quality Experiment

• PRR: Packet Received Ratio The real link quality

• Parameters: LQI: Link Quality Indicator RSSI: Received Signal Strength Indication CORR: Correlation

• Which one is the best?• How many samples?

WaterWell Online Water Quality Management - CSD Fall 2008

Experiment Set-up

Sender Receiver

1000 packets (1, 40, 80, 120 bytes)

-31dBm

100 different distances

WaterWell Online Water Quality Management - CSD Fall 2008

LQI ResultsPRR grows with LQI increases

WaterWell Online Water Quality Management - CSD Fall 2008

SAMPLES15 Samples: tradeoff between network overhead and LQI accuracy

WaterWell Online Water Quality Management - CSD Fall 2008

CONCLUSION

• Use LQI

• Use min. 15 Samples

Power Experiment

Sender Receiver

500 packets(containing output power value)

-32 to 31 dBm

7 different distances

OUTPUT POWERvs LQI

LQI 200

-25 dbm

-24 dbm

POWER ADJUSTMENT

• Base station helps

SunSPOT to adjust

output power

• Speed up negotiation:

– Adjust power between 22

power steps

– Dichotomy

WaterWell Online Water Quality Management - CSD Fall 2008

Aspect4. Busines

s

WaterWell Online Water Quality Management - CSD Fall 2008

BUSINESSAssessment Report

B

WaterWell Online Water Quality Management - CSD Fall 2008

Nästa:Implementation

Investigation

Marco’s Tasks

Design Documents

T

Solar Panel

Business Opportunities

Implementation

Final Reports

Testing

WaterWell Online Water Quality Management - CSD Fall 2008

30 Second Summary

• WSN offers many possibilities

• Sun SPOT Rocks !

• LQI is the best !

• Min. 15 Samples

• Deep Sleep Mode

• Everything is under control

WaterWell Online Water Quality Management - CSD Fall 2008

WaterWell Online Water Quality Management - CSD Fall 2008

WaterWell SolutionQuestions and Answers