Waterwell Midterm Presentation
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Transcript of 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