Software Issues in Wireless Sensor Networks - Application and Multidisciplinary Aspects of Wireless Sensor Networks - page 39

ITemperatureInput ourTempSensor = EDemoBoard.getADCTemperature();
double celsiusTemp = ourTempSensor.getCelsius();
double fahrTemp = ourTempSensor.getFahrenheit();

3.2.2.2 A SunSPOT “Blink” Application

As for TinyOS/nesC, we now present a Blink (Hello World) application for Sun
SPOTs.
package org.sunspotworld;
importcom.sun.spot.sensorboard.EDemoBoard;
importcom.sun.spot.sensorboard.peripheral.ISwitch;
importcom.sun.spot.sensorboard.peripheral.ITriColorLED;
importcom.sun.spot.util.*;
importjavax.microedition.midlet.MIDlet;
importjavax.microedition.midlet.MIDletStateChangeException;

public class Blink extends MIDlet {
private ITriColorLED [] leds =
eDemoBoard.getInstance().getLEDs();
protected void startApp() throws MIDletStateChangeException {
System.out.println(“Hello, world”);
ISwitch sw1 =
EDemoBoard.getInstance().getSwitches()[EDemoBoard.SW1];
leds[0].setRGB(100,0,0);

// set color to moderate red

while (sw1.isOpen()) { // done when switch is pressed

leds[0].setOn(); // Blink LED Utils.sleep

(250); // wait 1/4 seconds

leds[0].setOff();
Utils.sleep(1000); // wait 1 second

}
notifyDestroyed(); // cause the MIDlet to exit

}

protected void pauseApp() {
// This is not currently called by the Squawk VM

}
protected void destroyApp(boolean unconditional) throws
MIDletStateChangeException {
for (int i = 0; i < 8; i++) {
leds[i].setOff();

}

}

}

3.2.2.3 Radio Stream and Datagram Connections

Sun SPOT SDK provides two ways to perform communication between two Sun SPOT
devices: the radiostream protocol and the radiogram protocol. The basic difference is
in guarantees of delivery: the radiostream protocol provides stream-based reliable
service, while the radiogram protocol makes no guarantees on delivery or ordering.