WaterWell Final Presentation Athanasios Floros Chen Huang Gökhan Dogan Manzoor Bahader Tao Sun...

WaterWell Final Presentation

Athanasios Floros Chen Huang Gökhan Dogan

Manzoor Bahader Tao Sun Zhichao Cao

Csd 2008

Fall

http://www.tslab.ssvl.kth.se/csd/projects/0821006/

WaterWell Online Water Quality Management - CSD Fall 2008

Midterm Summary


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


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


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


Midterm Results

WSN offers many possibilities Sun SPOT Rocks ! LQI is the best ! Min. 15 Samples Deep Sleep Mode


The Story of Lonely Machines

SunSPOT 90-FLT and Sensor Probes eSerial converter


SunSPOT


Anatomy of a SunSPOT

Two types• Base station

• Free Range devices SunSPOT Parts

• Sensor Board

• Processor Board

• Battery


90-FLT


Sensor Probes

TDS, PH, mV, Turbidity, Conductivity, Dissolved oxygen and Temperature


eSerial converter


RS232 Interface Connects SunSPOT & 90-

FLT

eSerial converter


Schematic of the Connection


How did we come together?

Base Station

Free Range SPOT

Free Range SPOT

Free Range SPOT

Free Range SPOT

Sensor Probes

90-FLT Meter


We need Software

Software – Classes Software – Communication Software – System Life Loop


Software-Classes

HostStation Class• Runs on PC

• Data center and configure center WSNNode Class

• Runs on free-range Sun SPOT

• Data fetcher and transmitter Node Class

• Represent WSN nodes Message Classes

• Carrier of radio signal

• Five types: Hello, Syn, Ack, Data, ConfTime


Software-Communication


Software-System Life Loop

Wake Up Mechanism


We Consume Power

SunSPOT Power Consumption System Power Consumption


Sun SPOT Power Consumption

Power adjustment mechanism• Adjust radio output power for saving energy

Sun SPOT power consumption experiment • To test if output power affects whole power

consumption a lot

50000 and 100000 packets

Broadcast and UnicastIn 0m distanceWith Max(31) and Min(-32) power

Sender Receiver


Sun SPOT Power Consumption Conf.

Broadcast Unicast

Transmission power50000 packets

100000 packets

50000 packets

100000 packets

-32 dbm11.356 mAh

21.843 mAh

16.108 mAh

30.918 mAh

+31 dbm11.496 mAh

22.023 mAh

16.610 mAh

31.615 mAh

Limited energy is saved Radio consumes Besides, CPU, memory control, E-demoboard

consumes energy Power adjustment mechanism is unworthy


System Power Consumption Conf.

Wake-up mechanism is the only way Test objects

• Basestation Sun SPOT powered by PC

• Level Converter powered by Free-range Sun SPOT

• Only power consumption of Free-range Sun SPOT and 90-FLT meter is consıdered

Test scenario• Test for 4 days continuously

• 60 measurements per day

• With and without wake-up mechanism





System life depends on Sun SPOT life Normally, the system works for more than 3

weeks

Sun SPOT and 90-FLT lives in days


Features

System Life• Lasts for approximately 3 weeks

Wake-up Mechanism• Synchronization

• Periodically wake up


Features Cont.

Automation• No human interaction is needed

Node Feedback• Node status: able to detect node failure

• Battery information: both Sun SPOT and 90-FLT


Features Cont.

Packet Retransmission MAC layer (unicast only) and Application layer Cope with instability and abnormality of radio.

Fragmentation MAC layer fragmentation always causes delay

when deep sleeping. Large packet is fragmented. Fragment out of order.


Market Overview Of WSN


Customers in Malawi


Whole Product


The Swedish Environmental Protection Agency (SEPA)

Swedish University of Agricultural Sciences, Department of Environmental Assessments (SUAS)

Åbro to analyze the water quality for beer-brewing. Alfa Laval to use in wastewater treatment and

analyze the waste water.

Potential Customers in Sweden


How did we achieve ?

Website“Really excited to have my own place to post my

latest activities.” Cao

Sub-Teams• Member Rotation

Write it down!• Deliverables

Walk the Extra Mile !• Scientific Paper


30 Sec Recap.

Automated and Reliable Sun SPOT battery is not sustainable Wake-up Mechanism saves power WSN is not mature yet Happy New Year !


Q & A

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