155 lines
6.2 KiB
Markdown
155 lines
6.2 KiB
Markdown
# Seismograph Challenge
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Coding challenges for the seismograph.
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### ~avatar avatar
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Engineering: In this project, you will build a remote control based on the seismograph micro:bit activity using a second micro:bit and micro USB cable.
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### ~
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## What you'll need:
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* micro:bit (2)
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* micro USB cable (2)
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* Plate
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* Tape
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* Scissors
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![](/static/mb/lessons/seis_challenge01.png)
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## Before we get started
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Complete the [seismograph](/lessons/seismograph/activity) activity and your code will look like this:
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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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### ~avatar avatar
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Computer Science: Welcome! The activity will teach you how to code the acceleration of the 1st micro:bit and to visualize the acceleration on the 2nd micro:bit. Let's get started!
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### ~
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# Computer Science Steps
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## 1.
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We want to simply detach the blocks from the recent activity. We will use blocks from the activity to create a brand new program to show the way micro:bit devices communicate through the BLE (Bluetooth low energy) radio.
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```shuffle
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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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## 2.
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Let's measure `acceleration (mg)` and then `send number`. `Acceleration` is measured in **milli-gravities**, so a value of -1000 is equivalent to -1g or -9.81m/s^2. We will be able to get the acceleration value (g-force), in the specified "x" dimension. `Send number` will broadcast a number data packet to other micro:bits connected via radio.
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We need add send number block found in the Radio drawer. We will attach send number to acceleration and subtract the gravity from acceleration strength.
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Your finished code will look like this:
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```blocks
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radio.sendNumber(input.acceleration(Dimension.Strength) - 1023);
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```
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## 3.
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We want to display the acceleration forever. In order to do so, we need a `forever` loop. A forever loop will repeat code in the background forever. We need attach forever loop to send number.
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Your finished code will look like this:
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```blocks
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basic.forever(() => {
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radio.sendNumber(input.acceleration(Dimension.Strength) - 1023);
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});
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```
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## 4.
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We want to register code to run when a packet is received over radio. We can implement this code by adding `on data received`block found in the radio drawer.
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Your finished code will look like this:
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```blocks
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basic.forever(() => {
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radio.sendNumber(input.acceleration(Dimension.Strength) - 1023);
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});
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radio.onDataReceived(() => {
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});
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```
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## 5.
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Finally, we want to chart the acceleration. So we must first implement `plot bar graph`. `Plot Bar Graph` will display a vertical bar graph based on the value and high value. In order to transfer the receive the number from the 1st micro:bit, we must implement `receive number` to constantly display a vertical bar graph based on the value. Remember, the value will equal to the micro:bit's acceleration in the "x" direction.
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Your finished code will look like this:
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```blocks
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basic.forever(() => {
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radio.sendNumber(input.acceleration(Dimension.Strength) - 1023);
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});
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radio.onDataReceived(() => {
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led.plotBarGraph(radio.receiveNumber(), 0);
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});
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```
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### ~avatar avatar
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Science: Welcome! The activity will teach you how to chart the acceleration of the 1st micro:bit and to visualize the acceleration on the 2nd micro:bit. Let's get started!
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### ~
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# Science Steps:
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## 6.
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Notice that moving the micro:bit the farthest direction in the x direction will be -1023 on the charting beneath the simulator. The second observation will be that the LEDs will be full brightness on the 2nd micro:bit. There is a single LED turned on with the 1st micro:bit. Additionally, the graphs will reflect 0 acceleation for the 1st micro:bit. In this scenario, if you are adjusting the acceleration in the simualator, you are also changing your chart that will be produced.
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![](/static/mb/acc.png)
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### ~
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NOTE: The colors of the charts reflect the color of the micro:bit simulator. In this instance, the micro:bits are blue and green. So the colors of the line graphs reflect the colors of the micro:bit
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### ~
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After running this simulatation several seconds by moving the micro:bit side to side in the x direction, you are ready to graph or chart the accceleration of the micro:bit. We want a printout of our acceleration on Excel. We will graph the fluctuating acceleration of the simulation experiment.
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![](/static/mb/acc2.png)
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### ~
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Finally, you must open the Excel CSV file by clicking on the data.xls file that was downloaded to Downloads Folder.
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![](/static/mb/data3.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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![](/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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![](/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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![](/static/mb/elements_styles_filters.png)
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### ~
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Have fun reviewing your simulation and analyze the acceleration by chart the Excel data using Excel.
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* Connect the first micro:bit to your computer using your USB cable and run the charting script on it.
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* Connect the second micro:bit to your computer using your USB cable and run the charting script on it.
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* The first person and second person take turns tilting the micro:bit in the "x" direction while the other player charts the data on the micro:bit!
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* Review and analyze the actual micro:bit device acceleration 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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