Programming the Real-world

Introduction to SPOT

Peng Deng

CSSE University of MelbourneLabSUM∑

2

• Graduated from MEDC in 2008

• Research assistant in UniMelb– SensorWeb

• Software engineer in Daintree Networks– Implement wireless protocol decoder

3

Agenda

• Introduction– Evolution of Computing– WSN

• Sun SPOT– What is SPOT– Hardware and Software

• Tutorial

• Application Demos

• My Projects

4

Evolution of Computing4

2020 and beyond: Ubiquity Era

Thousands of computers per user.

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

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

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– Software -- Hardware

8

Sun SPOT Hardware

Antenna

2.4 GHz IEEE 802.15.4 Radio ModuleCC2420

180 MHz 32 bit

ARM920T core512K RAM4M Flash

Daughter board connector

Power switch

USB interface with mini-B connector

9

Sun SPOT Hardware [cont.]

8 3-colors LEDs Switches

Light sensor 3-D

Accelerometer

Analog in 4-5

Replicated switches "High" current outputsDigital I/O

Digital I/O 0-3 Analog inputs

Temperature sensor andA/D converter

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

11

TutorialGet Data From Sun SPOT

Sun SPOTsSun SPOTs

Sun SPOTBase StationSun SPOT

Base Station

PC(Processing)

PC(Processing)

Host Application

Embedded Application

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

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

}

14

Embedded Application//create instances of sensors on boardprivate IAccelerometer3D accel = EDemoBoard.getInstance().getAccelerometer(); private ITemperatureInput tempSensor = EDemoBoard.getInstance().getADCTemperature(); private ILightSensor lightSensor= EDemoBoard.getInstance().getLightSensor();

//application logic—get values from sensorsString 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 PCRadiogramConnection 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!

15

Host Application

J2SE applicationRadiogramConnection 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!

16

Debug Remote App

• Create a debug agent– ant debug -DremoteId=0014.4F01.0000.46E0

• Attache IDE Debuger

• Add your breakpoints

17

Applications

18

ApplicationsAutonomous Deployment

19

ApplicationsRobot

20

ApplicationsSwarms

Autonomous Light Air Vessels•Cell phone vibration motor to propel

•Roam around to find friend or seek food

•Spinning together

•Feed them

21

ApplicationsMike’s Flying Bike

Flying and Exercise!

Sun SPOT + Google Earth Flight Simulator

22

ApplicationsSPOTkin

Sun SPOT + Pumpkin?

23

My ProjectsGame Panel

Sun SPOT + Never Ball

24

My ProjectsVirtual Earth Controller

Sun SPOT + NASA World Wind

The earth is on your palm

25

My ProjectsGesture Recognition

Facts:1.Multi-attributes; 2. Data stream

Challenges:1.Recognition; 2. Segmentation

Solutions:1.Machine Learning; 2. Threshold+std dev

Accuracy: 17% ~ 97%

Q & A

27

Peng DengResearch Assistant

SUM Research LabCSSE University of Melbourne

Thank you

August 4, 2009