Introducción a las redes de sensores inlámbricos (WSN) y estudio particular de la solución Sun Spot de ORACLE.

1. Sun SPOT
Wireless Sensors Networks
José Jaime Ariza
ISIS group (University of Málaga)
Slideshare version, original version at http://jariza.net/ponencias.

2. 1. SENSORS NETWORKS

3. 1. SENSORS NETWORKS

4. 1. SENSORS NETWORKS

5. 1. SENSORS NETWORKS
Applications
• Air pollution.
• Forest fire detection.
• Water monitoring.
• Agriculture.
• Structural monitoring.
• Enviromental sensing.
• Machine monitoring.
• Etc...

6. 1. SENSORS NETWORKS
Gateway
Sensor
node
Sensor
node
Sensor
node
Sensor
node
Sensor
node
Sensor
node
Sensor
node

7. 1. SENSORS NETWORKS
Requirements
• Wireless communications.
• Low power consumption.
• Easy deployment.
• Sensors.
• Heterogeneous network.

8. 2. COMMUNICATIONS
A sensor may use a communication device to connect to a
network, but it is of key importance that devices “speak” a
common language.

9. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.
WIRELESS PERSONAL AREA
NETWORKS (WPAN)
WIRELESS LOCAL AREA
NETWORKS (WPAN)

10. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.

11. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.

12. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.
Security (authentication and privacy)
Hardware interfacing

13. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.
Fixed network

14. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.
Mobile network

15. 2. COMMUNICATIONS
ISO standarizes the different communication levels
of devices, so that they can understand each other.
Mobile network

16. 2. COMMUNICATIONS
For wireless sensor implementation there are several technologies...

17. 2. COMMUNICATIONS
For wireless sensor implementation there are several technologies...
ZigBee
(WPAN)
Bluetooth
(WLAN/WPAN)
Wi-Fi
(WLAN)
●802.15.4
●250 kbps
●TX: 35mA
●Standby: 3µA
●32-60 kB memory
●Sensors, remote
control...
●Mesh, P-P, P-M.
●802.15.1
●1 Mbps
●TX: 40mA
●Standby: 200µA
●100+ kB memory
●Telecom, audio...
●P-M.
●802.11
●300Mbps
●TX: > 400mA
●Standby: 20mA
●100+ kB memory
●Internet...
●P-M

18. 2. COMMUNICATIONS
For wireless sensor implementation there are several technologies...

19. 3. WIRELESS SENSORS
Sensor, processing and communication units can be packed into a tight, cheap
and low power circuit.

20. 3. WIRELESS SENSORS
Any sensor can connect to a WPAN and, through it, to any other wireless
network, like mobile phones, laptops, PDAs, etc.

21. 4. Sun SPOT
Sun
Small
Programmable
Object
Technology
Java platform for developing applications for wireless sensors

22. 4. Sun SPOT
314,93€

23. 4. Sun SPOT
Gateway
Mota

24. 4. Sun SPOT
Processor Board
• Core CPU: ARM9, 32bit, 400Mhz.
• RAM: 1Mb
• Flash: 8Mb
• Radio: 2.4 Ghz 802.15.4.
• USB interface.
• 3 serial lines.
• 770 mAh L-ion battery.
• Deep sleep: 40µA/65µA
• Temperature sensor.

25. 4. Sun SPOT
Sensor Board
• ATmega microcontroller.
• 4 digital GPIO.
• 4 analog GPIO and ADC.
• Tri-color light sensor.
• 2/4/8G 3-axis accelerometer.
• I2C.
• Speaker.
• IR receiver & IR transmitter.
• 8 RGB LEDs.
• 2 switches.

26. 4. Sun SPOT
Software
• Virtual Marchine
– Squawk VM (J2ME CLDC 1.1).
– Memory protection (bad code).
– Security protection (malicious code).
• Programming with...
– Java.
– Netbeans.
– SunSPOT SDK.

27. 4. Sun SPOT
Communications
• Wireless
– 802.15.4
– +250Kbps
– ZigBee support
– Topologies: adhoc, mesh, cluster tree, star.
• Wired
– USB

28. 4. Sun SPOT
Sqwak VM
• Mainly written in Java.
• Runs on ARM9 without underlying OS.
• Drivers written in Java.
• Open Source.
• Isolate application model.

29. 4. Sun SPOT
Build and deploy flow
Javac
Java source
Squawk suit
converter
SunSPOT
Build

30. 4. Sun SPOT
Sqwak split VM

31. 4. Sun SPOT
SunSPOT SDK
• Squawk Java VM: Desktop and Sun SPOT
• Libraries
– Java ME CLDC 1.1 libraries
– Hardware libraries
• SPI, PIO... (drivers written in Java)
• Demo sensor board library
– Wireless layer libraries
– Network layer libraries
• 802.15.4 MAC (layer written in Java)

32. 4. Sun SPOT
Code spnippet: send broadcast
try {
dgConnection =
(DatagramConnection) Connector.open("radiogram://broadcast:37");
dg = dgConnection.newDatagram(dgConnection.getMaximumLength());
dg.reset();
dg.writeUTF("I rock");
dgConnection.send(dg);
} catch (IOException ex) {
//Catch code
}

33. 4. Sun SPOT
Code spnippet: receive broadcast
try {
dgConnection =
(RadiogramConnection) Connector.open("radiogram://:37");
dg = dgConnection.newDatagram(dgConnection.getMaximumLength());
} catch (IOException e) {/*Catch code*/}
while(true){
try {
dg.reset();
dgConnection.receive(dg);
tmp = dg.readUTF();
} catch (IOException e) {/*Catch code*/}
}

34. 4. Sun SPOT
Code spnippet: sensors reading
ILightSensor lightSensor = (ILightSensor)
Resources.lookup(ILightSensor.class);
min = ((IMeasurementInfo)lightSensor).getMinValue();
max = ((IMeasurementInfo)lightSensor).getMaxValue();
lightLevel = lightSensor.getAverageValue();

35. 4. Sun SPOT
Code spnippet: outputs
ITriColorLEDArray leds = (ITriColorLEDArray)
Resources.lookup(ITriColorLEDArray.class);
leds.getLED(0).setOff();
leds.getLED(0).setColor(LEDColor.BLUE);
leds.getLED(0).setOn();
leds.getLED(3).setRGB(0, 0, 0);
speaker =
(IToneGenerator) Resources.lookup(IToneGenerator.class, "speaker");
speaker.startTone(freq);
speaker.stopTone();

36. Thank you
…
¿Any question?