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Now it s time to get some more practice with the DISPLAY and WAIT TIME blocks that you learned about in this chapter. Below are two exercises for creating new NXT-G programs for SPOT. (If you get stuck, the answers are at the end of this chapter.)
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Exercise 3-1. Display Your Own Text
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For this exercise, I d like you to modify the HelloWorld program. For this program, I want you to enter one line of text near the top of the LCD screen, a picture (your choice) below the text, and have both items displayed for 25 seconds before the program ends.
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Tip Keeping both the text and the picture on the screen at the same time requires a special option to be
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deselected.
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Exercise 3-2: Draw a Rectangle
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Use four DISPLAY blocks to manually draw a rectangle (or make it more challenging and draw a square) to the LCD screen. After a side of the square is drawn, have the robot pause for 5 seconds
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CHAPTER 3 HELLO WORLD!
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before drawing the next side. When the square is completed, have the robot pause for 10 seconds before the program ends.
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Tip Read Appendix A for help with the coordinate system and the starting and end points of each line.
What s Next
Spot needs to get moving! It s a little dull just watching him sit on the floor, so let s continue learning about blocks in 4 by giving him somewhere to go. You ll learn all about doing this with the MOVE block.
Exercise Solutions
Following are some possible exercise solutions. Remember, your solutions may be somewhat different. Results are what matter. Very often, there is more than one way to get to the same end result.
Exercise 3-1
Figure 3-13 shows the program for one possible solution. Figure 3-13 also shows the configuration panel for the first of the three program blocks. Figures 3-14 and 3-15 show the panels for the other two blocks. Notice that the second DISPLAY block (from the left) has its Clear box unchecked (Figure 3-14). Unchecking that box will keep the words I did it! on the LCD screen while the image is also displayed. If the Clear box remains checked, the text will be erased and only the image will be displayed.
Figure 3-13. Program s blocks and configuration panel for first DISPLAY block.
CHAPTER 3 HELLO WORLD!
Figure 3-14. Configuration panel for second DISPLAY block.
Figure 3-15. Configuration panel for WAIT TIME block.
Exercise 3-2
Figures 3-16 through 3-23 show the eight configuration panels for the eight blocks used in the program I wrote as my own solution to Exercise 3-2. Figure 3-16 shows the panel for the first block. Figures 3-17 through 3-23 show the panels for subsequent blocks. Notice that the first three WAIT TIME blocks (Figures 3-17, 3-19, 3-21) are all configured for 5 seconds; only the last WAIT TIME block (Figure 3-23) is set for 10 seconds. Do you see how the coordinates are manually entered to make the lines all match up perfectly Try to modify the coordinates to draw a perfect square. Also, remember that the Clear checkbox must be unchecked for the last three DISPLAY blocks (but not the first).
Figure 3-16. The program for Exercise 4 and the first DISPLAY block s configuration panel.
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Figure 3-17. Configuration panel for the first WAIT TIME block.
Figure 3-18. Configuration panel for the second DISPLAY block.
Figure 3-19. Configuration panel for the second WAIT TIME block.
Figure 3-20. Configuration panel for the third DISPLAY block.
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Figure 3-21. Configuration panel for the third WAIT TIME block.
Figure 3-22. Configuration panel for the fourth DISPLAY block.
Figure 3-23. Configuration panel for the final WAIT TIME block.
CHAPTER 4
Get Movin
I would say that the MOVE block is probably one of the most important blocks when it comes to programming a robot. Without the MOVE block, you can still build robots, but they won t be able to do much. They can sit on a desk or table (just like SPOT), but they re not going to be very exciting to watch. Any robot that you design that uses one or more motors will use the MOVE block. So, let s go over this very important block and see what it can do.
The MOVE block
Open your Mindstorms NXT software, and drag and drop a MOVE block from the Common Palette onto the beam. The configuration panel will appear in the lower left corner of the screen (see Figure 4-1).
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