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Figure 6-10. Making one change to the SOUND block will fix the problem. This time, SPOT does exactly what I wanted him to do. He plays the C note for 10 seconds, and when the SOUND block is finished, motors B and C spin, and SPOT moves forward 5 rotations. Perfect! Now you can add sound files and tones to your robots to give them more personality. But before we finish this chapter, let me also tell you that sounds can be used when testing your robots. For example, in a complex program you can drop in a SOUND block to let you know when the robot has reached a certain portion of the program. Let s say you want to know when your robot has reached the part of a program where it has to decide between turning left and turning right. You could place a SOUND block directly in front of the MOVE blocks and program a sound to play when turning left and a different sound for turning right. After you ve tested and verified the program is working properly, you can remove the SOUND blocks and run the program normally. In this example, SOUND blocks give you an idea of where a robot s program is currently executing by giving you an audible alert, which is very useful for troubleshooting and testing. Now, before we investigate any new blocks, I want to go over the different ways your robots receive input this includes motors, sensors, timers, and the buttons on the Brick. 7 covers all of this, so read on!

Figure 15-36. Place four long black connectors in the 13-hole beams. Connect two gray pins to the 15-hole beams and insert the axle rods in the Ultrasonic Sensor.

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Figure 16-8. The SWITCH block will help me display True or False on the screen. Now all that is left is for the LCD screen to display True or False. This is simple enough: I ll drop one DISPLAY block in the True tab (see Figure 16-9) that puts the word True on the LCD screen on Line 7. I ll drop another DISPLAY block in the False tab (see Figure 16-10) that puts the word False on the LCD screen on Line 7 (remember to remove the check from the Clear box so text on the LCD screen doesn t get erased). I ll position the True and False text so they are displayed on the LCD screen where X=12 and Y=8.

Figure 16-9. This DISPLAY block puts the word True on the screen. Now, if the statement is evaluated as True, the SWITCH block will execute the DISPLAY block found in the True tab. And if the statement is evaluated as False, the SWITCH block will execute the other DISPLAY block found in the False tab.

Figure 15-37. Connect the 13-hole beams to the 15-hole beams. Place the other two small bushings on the axle rods as shown.

Wired!

Figure 16-10. This DISPLAY block puts the word False on the screen. Next, I ll drop in a NXT BUTTON WAIT block and configure it to wait for the left button to be pressed (see Figure 16-11). This will allow me time to view the results.

Figure 15-38. Connect the 15-hole beams and the 13-hole beams as shown. Place the black pins in the 13-hole beams and four bushings on the axle rods.

ome of the questions I hear the most are related to data hubs and wires and for good reason! A block s data hub can be confusing, especially when a block has numerous options on the hub. And wires can be just as difficult to figure out. In this chapter, I want to take a short break from learning about NXT-G programming blocks and give you some background and tips on how to use data hubs and wires. I hope that any confusion you have will be cleared up by the end of this chapter.

And now I ve got an exercise for you. It shouldn t be too difficult if you understand the program we ve just created. One possible solution to the exercise is at the end of the chapter.

Figure 15-41. Connect the Ultrasonic Sensor and neck to the 11-hole beam on the main body as shown.

Modify the program to use two RANDOM blocks to create the Upper and Lower values used by the RANGE block. The Lower value should be between 30 and 40. The Upper value should be between 50 and 60. Use a third RANDOM block to generate the Test value between 5 and 95 and test whether this value falls outside the range. Use DISPLAY blocks to display the Upper and Lower values as well as the Test value and display True or False depending on whether the Test value falls outside the range.

To help you understand hubs and wires, let me start with a fake programming block called the COLOR block. This block is shown in Figure 7-1.

Figure 15-54. Connect the 15-hole beam and use the black connector to pin it. Now your GrabberBot needs to be wired up and programmed. Take a look at Figure 15-55 to see how I ve wired up the bot.

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