Java Solaris Communities Partners My Sun Sun Store United States Worldwide

Sun SPOT Quick Start Tutorial
»	Introduction
	A Short Tour of a Sun SPOT (current page)
»	The Ectoplasmic Bouncing Ball Demo
»	Loading and Running the Air Text Demo
»	Changing the Air Text Demo
»	Basestation in Action

Sun SPOT Quick Start Tutorial

A Short Tour of a Sun SPOT

How to Open a Sun SPOT

Before we run anything on the Sun SPOT, let's take a look at one of them. You should have three Sun SPOTs. One is a basestation and two are free-range Sun SPOTs.

Pick up one of the free-range Sun SPOTs. There is a lid on the Sun SPOT, sometimes called a Sun roof. You will need to take the lid off to get at some of the switches and LEDs. To open the lid, press firmly on the lid, down and back, on the edge of the lid near the small raised dot. You can think of that small-raised dot as the fingernail-catching dot. The closer to the edge that you press, the easier the lid will open. See the illustrations below:

The graphic shows a Sun SPOT, held in the left hand, with the right hand grasping the SPOT, thumb on top, fingers curled unde4rneath. The thumb and thumbnail are pressing down on a small bump on the lid. The graphic shows a Sun SPOT being held in the left hand. The thumb of the user's right hand is pressing down on the lid just above the radio fin. The lid is popping up on the end opposite from where the thumb is pressing down.

The opposite end of the lid will pop up. Grasp that opposite end to remove the Sun SPOT lid.

Now that you have opened it, you can see the LEDs and switches on the sensor board.

The graphic shows a Sun SPOT with the lid removed and the eDemo board exposed. The radio fin is pointing up and, near the top of the opening is a row of LEDs. Under the LEDs are two switches. Labels in the diagram call attention to the LED and switch locations.

These are under Java program control, so they will act differently, depending on the application that is running. That fin at the top of the SPOT is the radio fin housing the antenna for the wireless communication.

If you tilt the SPOT so that the fin is away from you, you will see the Control Button.

The illustration shows a Sun SPOT from the narrow end. The end shown is the one opposite the radio fin. It shows a small button to the left, LEDs on either side of the button, and a USB connector on the right. The diagram labels only the button, which is calls a 'Control Button.'

The Control Button is used to reset the SPOT, to put it to sleep, and to wake it up. If the SPOT is asleep, clicking once, briefly - just a tap - on the Control Button will wake the SPOT up. You may have to press hard, but you don't have to press long. If the SPOT is awake, clicking once on the Control Button will reset the SPOT and restart whatever program it was running. Pressing the Control Button down and holding it down for five seconds will put the SPOT to sleep. Let's try it out:

To turn on the SPOT: Pick up one of the free-range SPOTs. Press the SPOT Control Button firmly and briefly, just a tap. You have just turned it on. You should see the LED to the right flicker green for about two seconds. That's the SPOT looking to see if it is connected to a host workstation. Some of the LEDs on the top should also light up because there is a demo on the SPOT that turns them on.
To turn off the SPOT: Press the Control Button and hold it down for about five seconds. The LED to the left should flash red twice then go dark. You have just turned the SPOT off.
To reset the SPOT: Turn on the SPOT so the preloaded demo is running again. To reset a running SPOT, just tap the Control Button again. The LEDs on the right will flicker green for about two seconds.

That's it! You have mastered the SPOT Control Button.

NOTE: If the free-range Sun SPOT does not boot, if the LED to the right doesn't flicker when you tap the Control Button, the Sun SPOT probably needs to charge its battery. To charge a Sun SPOT battery, attach the SPOT, using the supplied USB cable, to the USB port on a working computer. The USB power will fully charge the Sun SPOT in approximately three hours.

Here is a little more detail on the LEDs that are on either side of the SPOT Control Button.

The illustration shows a Sun SPOT from the narrow end. The end shown is the one opposite the radio fin. It shows a small button to the left, LEDs on either side of the button, and a USB connector on the right. The diagram labels the leftmost LED as the 'Power LED' and the rightmost LED as the 'Activity LED.'

Those LEDs can be controlled by Java programs on the SPOT, but in ordinary circumstances, they are controlled by the operating environment on the SPOT. The LED on the left will tell you about the power status on the SPOT. Here are its most important signals:

Power LED Signal	Meaning
Three red flashes	Powering down
Slowly alternate between bright and dim green	Charging from USB; CPU active
Slowly alternate between dim green and off	Charging from USB; CPU asleep
Steady dim green	Attached to USB, fully charged; CPU active
Steady dim red	Battery low.
One short green flash	Resetting, restarting program.
One bright green pulse, sharp on, soft off	Powering up

The LED on the right is under application control. If that behavior is not changed, the system programs will use it to tell you about the communication status of the SPOT. Here are its most important signals.

Activity LED Signal	Meaning
Rapidly flash green	Searching for the host workstation on the USB connection
Flash green	Packets being received from the host workstation
Flash red	Packets being sent to the host workstation
Blink green twice every 12 seconds	Normal functioning as a basestation.

You've taken the basic tour of the Sun SPOT. Now we'd like you to try some demos .

Next: The Ectoplasmic Bouncing Ball Demo