86 lines
4.2 KiB
Markdown
86 lines
4.2 KiB
Markdown
# Activity
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Measure the acceleration on the micro:bit in the "x" direction.
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### ~avatar avatar
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Welcome! This activity will teach how to use the micro:bit to chart the acceleration in the "x" direction. Let's get started!
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### ~
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Let's measure `acceleration (mg)` in the "x" direction. Get the acceleration value (milli g-force), in one of three specified dimensions.
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```blocks
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input.acceleration(Dimension.X)
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```
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### ~
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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 the X dimension to measure the acceleration.
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```blocks
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basic.forever(() => {
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led.plotBarGraph(input.acceleration(Dimension.X), 0)
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})
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```
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### ~
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Notice that moving the micro:bit in the simulator from left to right (x direction) changes the values beneath the micro:bit in a range from 1023 to -1023 as measured in milli-gravities. By hovering over the micro:bit from left to right, you can observe changing values beneath the micro:bit simulator. Also, the LEDs shown on the Bar Graph fluctates based on the movement of the micro:bit simulator in the x direction. The line underneath the micro:bit simulator reflect the acceleration in the x direction.
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NOTE: The colors of the charts reflect the color of the micro:bit simulator. In this instance, the micro:bit is yellow. So the color of the data line reflects the color of the micro:bit
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### ~
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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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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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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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* 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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* 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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* Connect a micro:bit to your computer using your USB cable; compile; and repeat this experiment by moving the micro:bit in the "x" direction. Then collect and chart the data on Excel.
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* Review and analyze the actual micro:bit device data on Excel
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* Display acceleration with y or z using plot bar graph by changing acceleration from "x" to "y" or "z"
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### ~avatar avatar
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Excellent, you're ready to continue with the [challenges](/lessons/charting/challenge)
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### ~
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