151 lines
4.6 KiB
Markdown
151 lines
4.6 KiB
Markdown
# Seismograph Activity
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### ~avatar avatar
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In this project, you will build your own seismograph.
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## What you'll need:
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* micro:bit
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* USB cable
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* Scissors
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* Glue gun
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* String
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* Cup (Plastic or Paper)
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* Magnet
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Welcome! This activity will teach how to use the micro:bit to chart the strength of the acceleration. Let's get started!
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1. Setup Cup: Use scissors to cut a usable window on the cup, which will be a square sized hole at the lid side of the cup. Use scissors to create a small hole in the center of the base of the cup.
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2. Fasten Magnet: Fasten end of the string to the magnet with glue
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3. Secure String: Fasten string to base of the cup and hang the remaining string outside the base of the cup.
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### ~avatar avatar
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Seismograph built, let's code!
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### ~
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4. Go to Codemicrobit.com
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Click or tap Create Code
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Click or tap Block Editor
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### ~
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5.
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We will measure `acceleration (mg)` in terms of strength. Get the acceleration value (milli g-force), as measured in strength.
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```blocks
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input.acceleration(Dimension.Strength);
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```
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### ~
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6.
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Use the plot bar chart to visualize the acceleration on the LED screen of the micro:bit in the specified range. You implement plot Bar Graph to display a vertical bar graph based on the "value" and "high" value. Then you must insert acceleration in based on strength.
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```blocks
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basic.forever(() => {
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led.plotBarGraph(input.acceleration(Dimension.Strength), 0);
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});
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```
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### ~
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7.
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Finally, we subtract the gravity from acceleration strength.
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```blocks
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basic.forever(() => {
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led.plotBarGraph(input.acceleration(Dimension.Strength) - 1023, 0);
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});
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```
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### ~
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8.
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Notice that making vibrating the object below the micro:bit changes the values and the line appears as a wave to display the value of the strength as measured in milli-gravities. By making the object below the micro:bit vibrate, you will observe changing values of the micro:bit. Also, the LEDs shown on the Bar Graph fluctates based on the movement of the micro:bit strength.
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NOTE: The black color reflects the micro:bit device.
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### ~
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9.
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Vigorously move the micro:bit in the micro:bit simulatator by moving the micro:bit image from side to side. Every time the micro:bit moves in the x direction in the simulator, you are generating data points that can be reviewed in Excel. The more attempts to move the micro:bit from side to side, the more data being saved in Excel. After you have vigarously moved the micro:bit simulator from side to side for a sufficient amount of time, you are ready to graph or chart the accceleration of the micro:bit. We want a printout of our acceleration on Excel that can be graphed in Excel.
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### ~
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10.
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We want to chart the data collected by using a tool in Excel.
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The final part of this experiment is opening and reviewing the data in the Excel CSV file. Simply click on the line beneath the simulator. A CSV file will be generated to display the data points collected by moving the micro:bit in the X direction. Then click or tap on the data Excel file that was downloaded to your local Downloads Folder.
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### ~
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10.
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First, click or tap on the first two columns (A, B) to include the time of the data being collected; b) the results of acceleration data on the micro:bit
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Use the Recommended Charts command on the Insert tab to quickly create a chart that’s just right for your data.
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* Select the data that you want to include in your chart.
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* Click Insert > Recommended Charts.
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### ~
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11.
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* On the Recommended Charts tab, scroll through the list of chart types that Excel recommends for your data.
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Click any chart type to see how your data will look in that format.
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When you find the chart type that you want, click it, and then click OK. We want to select the chart called Line. A line chart is used to display trends over time. We will use the line chart because there are many data points over time.
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Tip: If you don’t see a chart type that you want, click the All Charts tab to see all of the available chart types.
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### ~
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12.
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* Use the Chart Elements, Chart Styles, and Chart Filters buttons next to the upper-right corner of the chart to add chart elements like axis titles or data labels, to customize the look of your chart
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### ~
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13.
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* Connect a micro:bit to your computer using your USB cable; compile; and repeat this experiment by vibrating the micro:bit. Then chart the data on Excel.
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### ~avatar avatar
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Excellent, you're ready to continue with the [challenges](/lessons/seismograph/challenge)
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### ~
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