birt barcode open source Figure 14-2. File Access menu in Font

Generation QR Code JIS X 0510 in Font Figure 14-2. File Access menu

Figure 14-2. File Access menu
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The Wait block at the end of the loop sets the time between samples in this case, 15 seconds. The number of samples is set by Until: in the loop count menu shown in Figure 14-3. If the loop count is set to 240 and the time between samples is 15s, the total data logging time is 3,600 seconds, or one hour. When you first try to do data logging, you might want to set Wait to a few seconds and take only a few samples to make sure that everything is working correctly. The sensor used in this example is the LEGO Light Sensor. You could also use the Color Sensor with the Action set for light or even one of the Light Sensors you built from 5. Remember to turn off any light generation the sensor might have or else it will spoil the reading. The first data point is taken immediately when you start the program, so you need to have everything ready at the start.
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Figure 14-3. Loop menu Every time you run the program, you need to go into the NXT-G environment to retrieve the data file. First, click the NXT window button (see Figure 14-4).
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Figure 14-4. NXT window button Then select the Memory tab (see Figure 14-5).
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Figure 14-5. Select the Memory tab
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On the Memory page, click the Other file type (see Figure 14-6). Select the appropriate data file name and click the Upload button. Save the file somewhere on your computer where you can feed it to your spreadsheet program. Make sure that you delete the file from the NXT, or else the next time you run the program it will just add the new data to the end of the old file.
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Figure 14-6. Memory tab You re probably familiar with the handheld light sticks used as emergency flashlights. They also make a tiny version that is used for fishing lures, and you can purchase these light sticks at sporting goods stores. The smaller light stick is easier to enclose in a box made out of LEGO bricks, as shown in Figure 14-7. Seal around the Light or Color Sensor with black electrical tape to make sure that no stray light bothers the experiment.
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Figure 14-7. Black box to hold the light stick
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When you re ready, break the little vial inside the glow stick to energize it, quickly put it in the box, put the lid on, start the program, and come back in an hour. Retrieve the data file and open it with a textbased editor such as Notepad. You can see the first few lines of the data file in Figure 14-8. In the Edit pull-down menu, pick Select All and then Copy.
Figure 14-8. DataFile opened with Notepad Open your spreadsheet program and select cell A1. Then in the Edit pull-down menu, choose Paste. All the data numbers should fill the A column, as shown in Figure 14-9.
Figure 14-9. Data pasted into the spreadsheet
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Next, in the Tools pull-down menu, select Chart, or follow whatever procedure generates plots for your particular program. A wizard (see Figure 14-10) allows customization of the chart for your experimental data.
Figure 14-10. Data plotted in the spreadsheet As you can see in the finished plot shown in Figure 14-11, the brightness of the light quickly drops and then stabilizes. You could make this into more of a scientific project by making multiple runs with sticks that are at different temperatures.
Figure 14-11. Light level over time
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Another interesting long-term experiment is to observe the temperature of a disposable hand warmer over time (see Figure 14-12) using the Temperature Sensor from 5. Hand warmer devices work by an exothermic chemical reaction that creates rust inside a porous bag. There s some iron dust in the bag, along with some other ingredients that cause the iron to rust quickly and heat up when it s exposed to moisture in the air. It can take ten hours to fully use up the supply of chemicals in the bag.
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