1. Sun SPOT Introduction Miloš Solujić

2. Outline SPOT – beginnings Technical details - hardware Technical details - software Basestations SPOT – Pros and Cons Example application Questions

3. SPOT – beginnings SPOT stands for Small Programmable Object Technology Java is already available on few bilion cellphones – next step is SPOT Sun Labs launched new platform for playing with sensing on Java ME It is Java ME – CLDC – MIDP compatible

4. Technical details - hardware 180 MHz 32 bit ARM920T 512K RAM - 4M Flash 2.4 GHz IEEE 802.15.4 radio USB interface Example Board: 2G/6G 3-axis accelerometer Temperature sensor Light sensor

5. Technical details - hardware 8 tri-color LEDs 6 analog inputs 2 momentary switches 5 general purpose I/O pins 4 high current output pins Battery can operate for few weeks if application is well designed

6. Technical details - software Squawk – Java virtual machine written in Java, for SPOT, but not only Designed for resource constrained systems, like SPOT Manages power and other features of SPOT transparently for programmer Isolates – support for multiple independent execution spaces Aim is to be fittable on 16KB in future

7. Technical details - software Lots of libraries, with drivers for: ◦ The on-board LED ◦ The PIO, AIC, USART ◦ The CC2420 radio chip, IEEE 802.15.4 ◦ The base-station support ◦ The over-the-air (OTA) ◦ The radio policy manager ◦ And so on…

8. Technical details - software – example code using libraries String ourAddress = System.getProperty("IEEE_ADDRESS"); IScalarInput lightSensor = EDemoBoard.getInstance().getLightSensor(); ITriColorLED[] leds = EDemoBoard.getInstance().getLEDs(); System.out.println("Starting sensor sampler application on " + ourAddress + "..."); System.err.println("Caught " + e + " in connection initialization."); now = System.currentTimeMillis(); // Go to sleep to conserve battery Utils.sleep(SAMPLE_PERIOD - (System.currentTimeMillis() - now));

9. Technical details - software SPOT applications conform to the MIDlet standard startApp(), pauseApp() and destroyApp()- three methods to be implemented in any on-SPOT application

10. Basestations Basestations: to allow applications running on the Host to interact with applications running on Targets may run in either dedicated or shared mode any Sun SPOT can be used as the basestation ant startbasestation is needed to start SPOT attached via USB as basestation

11. SPOT – pros and cons Pros ◦ Java enabled ◦ It is low steep curve of learning for SPOT ◦ Good documentation, community ◦ Simulator Cons ◦ Not so small ◦ Security not on high level ◦ Some issues working with linux

12. Example application: Symbiotic Networks Concept introduced by David Loftus and Srdjan Krco, Ericsson Ireland Current status: prototype of system is designed and implemented It is tested in laboratory conditions

13. Symbiotic Networks System overview Highly decomposable system design, still possible to deploy on single PC Proof of concept level of implementation, but good base for design of enterprise-level application

14. Data Collection Point - DCP

15. DCP – Some State Diagram EVENT REPORTING Presented main part of work method in DcpReporter No unnecessary processor working Good scalability = dozens of sensors on same base station with humble resources

16. Control Centre - CC

17. Symbiotic Networks - Screenshots

20. Questions… Contact: Miloš Solujić, sole@etf.rs