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To determine if this is happening, the FILE ACCESS block has a very useful Error data plug that returns a True or False Logic value You can drag a data wire out of the Error data plug and use it as a condition to monitor For example, a LOOP.

Now, that example involved reading the data directly from the VARIABLE block. What if I want to put some data in Then I d have to write some data into the block. Here is how you do it. Take a look at Figure 18-5. In this figure, I ve selected Write in the Action section.

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Figure 16-4. This MOVE block controls the GrabberBot s movement down the tunnel. What if my calculations were a little off Well, I did round the number of rotations from 8.5714 (when I divided 60 inches by 7 inches earlier), so could this make my GrabberBot possibly bump the scroll If you look again at Figure 16-3, you ll notice that I ve got another foot-and-a-half of distance before the scroll, so I should be safe. That s why I intentionally chose to stop the bot at the 6-foot mark and not the 7-foot position. Now I m going to upload my program and test it. I have a measuring tape, and I want to make sure that my bot moves forward about 5 feet and no more. I test it and . . . it works. I press the Start button (Touch Sensor), and the bot moves forward almost exactly 5 feet from its starting point. Excellent. Because I need to take a deep breath at this point (and maybe you do, too), I m going to have my bot pause for 10 seconds. I m doing this because as I mentioned in 14, if I find that my bot isn t lined up exactly where I want it, I could use the string that I m going to tie to the rear of my bot and pull it back. It s not the best solution, but I really want my bot to make one attempt on the scroll, and I want it to be successful. So I ll add in a WAIT block, which will let me look down the tunnel and make certain the bot is pointed directly forward and that the arm mechanism will fit smoothly underneath the scroll s supporting legs (see Figure 16-5).

block could be configured to break when a True value is received from the Error data plug the loop breaks and the program continues. This chapter has only touched lightly on the power of the FILE ACCESS block. Believe me; there are many more uses for this block, and you ll find that giving your robots the ability to record data (and later retrieve it) will be a powerful tool. You can use it to keep track of light values, left and right turns, and more. Play around and experiment with the FILE ACCESS block to learn the little tricks that will allow you to give your robot a long-term memory! Up next, make sure your Light and Sound sensors are working properly using the CALIBRATION block.

Figure 18-5. The VARIABLE block with Write selected in the Action section In Figure 18-5, I can change the logic value. Remember that the default is False, so I ve changed it to True. Did you also notice the input data plug that was added on the data hub This means that I could actually have the True or False value determined by a data wire from another block. (In this example, the data wire must carry a logic value of True or False; anything else would give me a broken wire that wouldn t work. Likewise, if the List section has Number or Text selected, the input data wire must be providing a data type of the selected item.) Figure 18-6 shows the configuration panels for the Number 1 and Text 1 blocks. I m including them, because I want you to see how you can modify the data when the Action option is set to Write. For the Number 1 variable, you can type either a positive or a negative value in the Value field. For the Text 1 variable, you can type words, sentences, or even entire paragraphs in the Value field.

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