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Figure 8-14 is a photograph of the Sharp GP2D12 (Acroname #R48-IR12), which is a self-contained infrared rangefinder. It measures distances from 4 inches (10cm) to 31 inches (80cm). Infrared rangefinders are typically used in equipment such as copy machines to measure the location of paper or other moving parts. One advantage of the GP2D12 over the NXT Ultrasonic Distance Sensor is that it s unaffected by other distance sensors that might be operating nearby.

9. Go over to Blend s States panel and click Add state group, as I am about to do in Figure 68. Blend then highlights the new StateGroup so you can name it. Name the new StateGroup MouseEnterLeaveStateGroup, as I have done in Figure 6-9.

public void setTime(Date t) throws RemoteException; public Date getTime() throws RemoteException; public boolean isValidTime() throws RemoteException; }

Figure 6-9. Name the StateGroup. Notice that next to the StateGroup name you can see 0s. This represents the amount of time in seconds that it takes for the States (yet to be added) to complete.

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Figure 8-14. GP2D12 infrared rangefinder It works by sending out a short burst of infrared light from an LED every 32ms. The beam is dark red and barely visible to the naked eye. If you look at it with a digital camera, you can clearly see the beam, as in Figure 8-15. The beam is fairly narrow and is only about 2 inches (6cm) in diameter at a distance of 31 inches (80cm).

complete. Your States panel should look like what I have in Figure 6-10.

I ll give two implementations of this service. The first is given in this section and is the dumb one: when the timer starts, it guesses at a start time and enters an invalid state. It uses a separate thread (a ticker ) to keep increasing its time every second (approximately). When its time is set, it becomes valid, but it will probably drift from the correct time due to its use of a sleep to keep changing the time. The dumb ticker timer is as follows: package clock.service; import java.util.Date; import java.rmi.RemoteException; public class TickerTimer implements Timer { private Date time; private boolean isValid; private Ticker ticker; /** * Constructor with no starting time has * invalid timer and any time */ public TickerTimer() { time = new Date(0); isValid = false; ticker = new Ticker(time); ticker.start(); } public TickerTimer(Date t) { time = t; isValid = true; ticker = new Ticker(time); ticker.start(); } public void setTime(Date t) { System.out.println("Setting time to " + t); time = t; isValid = true; if (ticker != null) { ticker.stopRunning(); } ticker = new Ticker(time); ticker.start(); }

Figure 6-10. Your States panel should look like what I have here. With the VisualStateGroup created you can now add a State (called a VisualState in code).

public Date getTime() { return ticker.getTime(); } public boolean isValidTime() { if (isValid) { return true; } else { return false; } } } class Ticker extends Thread { private Date time; private boolean keepRunning = true; public Ticker(Date t) { time = t; } public Date getTime() { return time; } public void run() { while (keepRunning) { try { sleep(1000); } catch(InterruptedException e) { } time = new Date(time.getTime() + 1000); } } public void stopRunning() { keepRunning = false; } }

11. To add a State click the Add state button, as I am about to do in Figure 6-11.

Figure 8-15. Infrared beam as seen with a digital camera The block diagram of the sensor is shown in Figure 8-16. A type of one-dimensional camera called a Position Sensing Device (PSD) is then used to receive the reflection of the beam from an object in front of the sensor. The distance to the object is directly related to where the spot lies along the onedimensional image. The sensor outputs a voltage between 0.4V and 2.4V, and is roughly inversely proportional to the distance. That is, the farther away the object, the lower the output voltage.

State MouseLeave. Your States panel should look like what I have in Figure 6-12.

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