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CHAPTER 19 BASIC TEXT
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Figure 19-3. Three string values combined and sent to the DISPLAY block Next, add a TIME WAIT block, so you can view the text before the program ends and the text disappears. You ll configure the WAIT block for 10 seconds (see Figure 19-4).
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CHAPTER 19 BASIC TEXT
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Figure 19-4. This WAIT block gives you time to view the results on the screen. When you run the program, it now displays I am SPOT on the LCD screen. In 18, I showed you how to use the VARIABLE block. You could use this block to send text to the TEXT block using the input data plugs (A, B, and/or C). To do this, you would configure three VARIABLE blocks to each hold a bit of text. Drag a wire out of each VARIABLE block into ports A, B, and C and let the TEXT block do the rest!
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Exercise 19-1: Counting Characters
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Now for a short and easy exercise. Create a program that uses the TEXT block to combine three separate strings, each with a length of 10 characters. Use a combination of characters that when displayed on the LCD screen will make it easy for you to count the maximum number of characters that can be displayed on a single line.
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CHAPTER 19 BASIC TEXT
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The information from this exercise will be useful when it comes time to determine how much text can be squeezed on to a single line. I ve included one possible solution at the end of the chapter.
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Continue on to the next chapter where I ll show you how to program your robot with some basic math skills. Believe it or not, the more complicated your robot becomes, the more likely it is that it will need to perform some addition, subtraction, or possibly even multiplication and division. Your robot isn t smart enough to do the math itself, so it s going to require a special block that assists it with performing calculations.
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Exercise Solution
Figures 19-5 to 19-13 show the complete program and configuration panels for Exercise 19-1. Notice that I ve configured the DISPLAY block to start displaying any text it receives at a position where X=1. This will place the first character in any string all the way to the left side of the LCD screen. I ve also created three variables (String1, String2, and String 3). See 14 for instructions on creating a variable, one for each of the VARIABLE blocks. The first three VARIABLE blocks have their Action setting set to Write so I can enter a string of text. The next three VARIABLE blocks (wired to the TEXT block) have their Action setting set to Read so the data stored inside can be read by the TEXT block. (Try wiring the TEXT block using the first three VARIABLE blocks you ll see that a VARIABLE block set to Write cannot be used to provide that data via its output data plug.)
Figure 19-5. The complete program and the first VARIABLE block s configuration panel
CHAPTER 19 BASIC TEXT
Figure 19-6. The second VARIABLE block s configuration panel
Figure 19-7. The third VARIABLE block s configuration panel
Figure 19-8. The fourth VARIABLE block s configuration panel
Figure 19-9. The fifth VARIABLE block s configuration panel
CHAPTER 19 BASIC TEXT
Figure 19-10. The sixth VARIABLE block s configuration panel
Figure 19-11. The TEXT block s configuration panel
Figure 19-12. The DISPLAY block s configuration panel
Figure 19-13. The NXT BUTTON WAIT block s configuration panel
C H A P T E R 20
Basic Math
Don t you just love short chapters Well, I promise this is going to be another extremely short chapter. So get ready to add another programming block to your collection of tools you re going to turn your robot into a calculator.
The MATH Block
Your robots can do some very simple math: addition, subtraction, multiplication, and division. Take a look at Figure 20-1, which shows the MATH block and its configuration panel.
Figure 20-1. The MATH block and its configuration panel
CHAPTER 20 BASIC MATH
The MATH block uses two values: A and B. For NXT-G 1.0 users, these values can be positive or negative integers. An integer is a whole number with no decimal values. If you attempt to enter in a number such as 4.3 or 10.8 the MATH block will round the values up or down to the nearest integer ( 4 and 11 for my examples). But for NXT-G 2.0 users, you are not limited to integer math. Decimal values are allowed. In the Operation section, there is a drop-down menu for you to select the type of operation to be performed. If you click the drop-down menu, you should see the following options: Addition: This option will add values A and B. Subtraction: This option will subtract value B from value A. Multiplication: This option will multiply value A by value B. Division: This option will divide value A by value B. Absolute value: This option will calculate the absolute value of A. Square root: This option will calculate the square root of value A.
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