waterwell midterm presentation

WaterWell Online Water Quality Management - CSD Fall 2008

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


1.

STATEMENT

PROBLEM


Blantyre,Malawi


Technology vs. Problem

K.O

• WSN• Sensors• Sun SPOTs• Solar Panel

• Automation• Accurate Results

• Wide-Area• Power Source


PreviousWork


2.

CONTRIBUTION

UNIQUE


Reading Serial Data


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


Real-Life


Consumption3. POWER


WaterWell System

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

WSN Node

• Reading data from

sensor

• Sending data to base

station


How does it work ?


System Diagrams

Sequence Diagram State Transition Diagram


Power Consumption Issues

• Problems:• Sustainability• Sensors’ Power

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


Wake-Up Mechanism

Wake-up Mechanism

Sensor


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?


Experiment Set-up

Sender Receiver

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

-31dBm

100 different distances


LQI ResultsPRR grows with LQI increases


SAMPLES15 Samples: tradeoff between network overhead and LQI accuracy


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


Aspect4. Busines

s


BUSINESSAssessment Report

B


Nästa:Implementation

Investigation

Marco’s Tasks

Design Documents

T

Solar Panel

Business Opportunities

Implementation

Final Reports

Testing


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 SolutionQuestions and Answers

waterwell midterm presentation

Education

waterwell solution questions

link quality indicator

real link quality parameters

waterwell system host

output power vs lqi

output power speed

output power value

power steps dichotomy