1. Programming the Real-world
Introduction to SPOT
Peng Deng
∑ SUMLab
CSSE University of Melbourne

2. • Graduated from MEDC in 2008
• Research assistant in UniMelb
– SensorWeb
• Software engineer in Daintree Networks
– Implement wireless protocol decoder
2

3. Agenda
• Introduction
– Evolution of Computing
– WSN
• Sun SPOT
– What is SPOT
– Hardware and Software
• Tutorial
• Application Demos
• My Projects
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4. Evolution of Computing
4
2020 and beyond: Ubiquity Era
Thousands of computers per user.
4

5. Wireless Sensor Network
• Small-scale sensor nodes
• Wireless communication
• Large scale of deployment
• Unattended operation
• ……
• Environmental monitoring
• Security
• Defence
• Bioinformatics and health
• Transportation management
• Chemical detection and emergency response
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6. TinyOS and Crossbow
• Difficult to setup development environment
– TinyOS SDK, JDK, cygwin…
• Difficult to program
– No process/memory management
– Applilcation = scheduler + graph of components
– nesC: Low level language
• Lack computing power
– MICA2 7MHz 128K; MICAz 4MHz 128K
• Open source software, propitiatory hardware
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7. What is Sun SPOT
• Embedded Development Platform
– Flexible hardware and software
• Easy to program – Java top to bottom
– User programs the device entirely in Java
– Using standard Java tools
• Connected – Wireless Communication
– Mesh networking
– Over the Air Programming
• Mobile
– Built in battery charged through USB
• Aware and Active
– Able to sense and affect surroundings
• Secure
– Built-in asymmetric cryptography
• Open Source
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– Software -- Hardware

8. Sun SPOT Hardware
2.4 GHz IEEE
802.15.4 Radio
Antenna
Module
CC2420
180 MHz 32 bit
512K RAM
ARM920T core 4M Flash
USB interface
with
Daughter board mini-B connector
connector
8
Power switch

9. Sun SPOT Hardware [cont.]
8 3-colors LEDs Switches
Light sensor 3-D
Accelerometer
Analog in 4-5 Temperature
sensor and
A/D converter
Digital I/O 0-3 Analog inputs
Replicated switches Digital I/O "High" current outputs
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10. Sun SPOT Software
• Squawk Virtual Machine
– J2ME CLDC 1.1 (cellphone without display)
– Runs on bare metal (No OS)
– Designed for memory constrained devices
– Runs multiple applications (concurrently)
• IDE Supported
– NetBeans, Eclipse, …… any Java IDE you familiar
with
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11. Tutorial
Get Data From Sun SPOT
PC
PC Host Application
(Processing)
(Processing)
Sun SPOT
Sun SPOT
Base Station
Base Station
Sun SPOTs
Sun SPOTs Embedded Application
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12. App Dev Procedure
1. Create Sun SPOT project or Sun SPOT
Host project
2. Implement your application
3. Connect, compile and deploy
application to SPOT
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13. Embedded Application
Import …
public class StartApplication extends MIDlet {
protected void startApp() throws MIDletStateChangeException {
//application logic
}
protected void pauseApp() {} //not used
protected void destroyApp(boolean unconditional) throws
MIDletStateChangeException {} //execute when exit
}
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14. Embedded Application
//create instances of sensors on board
private IAccelerometer3D accel = EDemoBoard.getInstance().getAccelerometer();
private ITemperatureInput tempSensor = EDemoBoard.getInstance().getADCTemperature();
private ILightSensor lightSensor= EDemoBoard.getInstance().getLightSensor();
//application logic—get values from sensors
String msg = String.valueOf(accel.getAccelX())+";"+
String.valueOf(accel.getAccelY())+";"+
String.valueOf(accel.getAccelZ())+";"+
String.valueOf(tempSensor.getCelsius())+";"+
String.valueOf(lightSensor.getValue());
//send data back to PC
RadiogramConnection conn =(RadiogramConnection)Connector.open("radiogram://0014.4F01.0000.4BFD:100");
Datagram dg = conn.newDatagram(conn.getMaximumLength());
dg.writeUTF(msg);
conn.send(dg);
conn.close();
9 lines of code!
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15. Host Application
J2SE application
RadiogramConnection conn = (RadiogramConnection) Connector.open("radiogram://:100");
Datagram dg = conn.newDatagram(conn.getMaximumLength());
conn.receive(dg);
String rawData = dg.readUTF();
System.out.println(rawData);
conn.close();
DONE!
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16. Debug Remote App
• Create a debug agent
– ant debug -DremoteId=0014.4F01.0000.46E0
• Attache IDE Debuger
• Add your breakpoints
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17. Applications
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18. Applications
Autonomous Deployment
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19. Applications
Robot
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20. Applications
Swarms
Autonomous Light Air Vessels
•Cell phone vibration motor to propel
•Roam around to find friend or seek food
•Spinning together
•Feed them
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21. Applications
Mike’s Flying Bike
Flying and Exercise!
Sun SPOT + Google Earth Flight Simulator
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22. Applications
SPOTkin
Sun SPOT + Pumpkin?
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23. My Projects
Game Panel
Sun SPOT + Never Ball
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24. My Projects
Virtual Earth Controller
The earth is on your palm
Sun SPOT + NASA World Wind
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25. My Projects
Gesture Recognition
Facts:
1.Multi-attributes; 2. Data stream
Challenges:
1.Recognition; 2. Segmentation
Solutions:
1.Machine Learning; 2. Threshold+std dev
Accuracy: 17% ~ 97%
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26. Q&A

27. Thank you
Peng Deng
Research Assistant
SUM Research Lab
CSSE University of Melbourne
August 4, 2009 27