161 lines
5.3 KiB
Markdown
161 lines
5.3 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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### ~
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## What you'll need:
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* micro:bit
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* USB cable
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* Plate
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* Tape
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* Scissors
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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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Step 1. Prepare Tape: Measure and cut approximately 10mm of tape. The tape will be fastened to a micro USB cable.
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![](/static/mb/lessons/seismograph1.png)
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Step 2. Fasten Tape: Fasten tape to the micro USB cable and to the plate. Attach the micro:bit to the micro:bit USB cable.
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![](/static/mb/lessons/seismograph0.png)
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### ~avatar avatar
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Seismograph built, let's code!
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### ~
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Step 1. Go to Codemicrobit.com
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Click or tap New Project
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Click or tap Blocks
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Step 2.
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We will measure `acceleration (mg)` in terms of strength or Magnitude. Get the acceleration value (milli g-force), as measured in strength or Magnitude.
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```blocks
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input.acceleration(Dimension.Strength);
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```
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Step 3.
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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 forever and plot Bar Graph to constantly display a vertical bar graph, which will be based on the "value" and "high" value. Then measure the acceleration based on the strength or Magnitude.
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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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Step 4.
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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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Step 5.
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First, notice that making moving the micro:bit simulator in any direction will change the values from a flat horizontal line to a waving line to display the value of the strength as measured in milli-gravities. Next, notice that by moving the micro:bit simulator below, there is a changing acceleration value. Finally, notice that the LED display will fluctate based on the movement of the micro:bit simulator.
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![](/static/mb/data4.png)
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### ~
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Step 6.
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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 any 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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Step 7.
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* Connect a micro:bit to your computer using your USB cable
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![](/static/mb/lessons/seismograph3.png)
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* Press compile button for the seismograph program to run on the micro:bit.
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![](/static/mb/lessons/seismograph4.png)
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A black colored flat line appears to measure micro:bit acceleration beneath the colored micro:bit simulator line.
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Run the acceleration experiment by moving the actual micro:bit.
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First, notice that by moving the actual micro:bit in any direction, you will change the values of the black, flat horizontal line. The black line will change from being flate to being a waving black line. The changing values of the micro:bit accelereration is being measured in milli-gravities. Next, notice that by moving the micro:bit below, there is a changing acceleration value. Finally, notice that the LED display will fluctate based on the movement of the micro:bit.
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### ~
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Step 8.
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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 charts area beneath the simulator. A CSV file will be generated to display the data points collected by the micro:bit. Click or tap on the data Excel file that was downloaded to your local Downloads Folder.
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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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![](/static/mb/data7.png)
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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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Step 9.
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![](/static/mb/chart1.png)
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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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Step 10.
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![](/static/mb/chart_title.png)
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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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Step 11.
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![](/static/mb/elements_styles_filters.png)
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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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