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CHAPTER 8 STRINGBOT PROGRAM IT
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Figure 8-5. The basic SWITCH block
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Note The SWITCH block is located on the COMMON palette and on the COMPLETE palette. In most
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instances, just look around on the COMMON and COMPLETE palettes and you ll find the necessary blocks. If it helps, you can hover the mouse over a block for a few seconds a small hint block will appear telling you the name of the block.
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Okay, let s get back to programming the StringBot.
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As you begin to put the program together, I want to suggest that you start adding comment text as you move forward. The comments you add will help you remember not only why you re using a certain block, but they can also be used to tell you how a block is configured. In the remaining programming figures, I ll include comments so you ll see what I mean. Now, what was that first Task List item Fairly simple: wait on the string while an object is loaded in the carrier. You re going to use a LOOP block, but this one is a little different from the one seen in 4. With this LOOP block, instead of testing for a sensor to be triggered (such as the Sound Sensor or Ultrasonic Sensor), you re going to have the block wait for a button on the Brick to be pressed. (You could use a simple WAIT block configured to wait for a button to be pressed, but you re using the LOOP block because you can later add more blocks inside the LOOP block if you wish, and add more options for your bot later on.) Take a look at Figure 8-6 to see how I did this.
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CHAPTER 8 STRINGBOT PROGRAM IT
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Figure 8-6. Using a LOOP block to hold the StringBot until an object is placed in the carrier In Figure 8-6, I ve configured the LOOP block to check and see if the Enter button (orange button) on the Brick has been pressed. Once the button has been pressed, the rest of the program will begin to execute. I could just as easily have included the Touch Sensor on my StringBot and had the LOOP block test to see if the Touch Sensor was pressed. But because I wanted to keep my StringBot light in weight, reducing the amount of sensors was important. The Brick has to be included, so I might as well use its buttons in place of the Touch Sensor, right So, while the StringBot is sitting on the string, waiting, we ll place an object in the carrier. Once the carrier is loaded, the next step is to start the StringBot moving along the string. If you remember, one of our conditions was that we wanted the StringBot to slow down as it neared the jar. We then want the motors to spin again, but slowly, so that we have more control over the accuracy of putting the bot over the jar. To do this, you re going to use LOOP blocks again. The first LOOP block will run the motors at high speed and the second LOOP block will run the motors at a reduced speed. You ll use your voice (with the Sound Sensor) to control when the bot switches from high speed to low speed. You ll place the first LOOP block as shown in Figure 8-7.
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Figure 8-7. This LOOP block will allow you to stop the high-speed bot with your voice. In Figure 8-7, I ve configured the LOOP block to use the Sound Sensor. I set the threshold to 90 (I ll probably have to yell) so the LOOP will end when the Sound Sensor is triggered. Now you need to place the MOVE block so the motors will run at high speed (see Figure 8-8).
Figure 8-8. This MOVE block runs the motors at high speed. After the Sound Sensor is triggered, you want the motors to stop. Figure 8-9 shows the program so far.
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