199 lines
7.5 KiB
Markdown
199 lines
7.5 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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* BBC micro:bits (2)
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* micro USB cables (2)
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* Plate
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* Tape
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* Scissors
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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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First, notice that moving the 1st micro:bit in the simulator in any direction, you will change the acceleration value of the 2nd micro:bit. Also, notice that by moving the micro:bit simulator, there is a changing acceleration value of the second micro:bit. Second, the flat colored horizontal line will start a waving line on the 2nd micro:bit to display the value of the strength as measured in milli-gravities. Finally, notice that the LED display will fluctate based on the movement of the 2nd micro:bit simulator.
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## 7.
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Connect the 2nd micro:bit to your computer using your USB cable. We should have two micro:bit devices attached to the computer.
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## 8.
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Click or tap the compile button for the seismograph program to run the program on the 1st micro:bit and 2nd micro:bit.
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## 9.
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The black lines should appear directly beneath the colored lines. The black lines measure the micro:bit acceleration. And the colored lines measures micro:bit simulator acceleration.
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Run the acceleration experiment by vigarously moving the plate in any direction or move the object below the micro:bit (such as a table).
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Every time the micro:bit moves in any direction, you generate data points that can be reviewed in Excel later. The more attempts to move the micro:bit, the more data to be reviewed in Excel. Notice that the LED on the 2nd micro:bit changes to communicate the movement of the 1st micro:bit.
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Now we are ready to graph or chart the accceleration of the micro:bit. We want a printout of the micro:bit acceleration graphed in Excel.
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## 10.
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In order to receive the the data plotted by Excel, click or tap anywhere in the on the chart data.
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## 11.
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You have two options to Analyze Data:
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* Local File: Save the data to your local Downloads folder and open it in Excel.
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* Stream to Cloud: Upload your data to Microsoft Azure to analyze it.
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Click or tap Download data
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## 12.
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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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## 13.
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Select the data that you want to include in your chart. The chart should include the first two columns: time and acceleration.
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Click or tap on the first two columns (A, B) to include time and acceleration data from the micro:bit. We only need the first two columns (A, B) because the 2nd micro:bit changes have been communicated by the 1st micro:bit. So the data points of the seismograph are being recorded on the 1st micro:bit.
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## 14.
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Click or tap on Insert then select Recommended Charts. We can select a chart that’s just right for the data.
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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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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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Click on the chart type to see how your data will look in that format. When you find the chart type that you want, click it, and then click OK.
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Tip: If you don’t see the line chart, click the All Charts tab to see the line chart.
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## 15.
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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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Alternatively, click or tap on the Design Ribbon.
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Let's select Style 10 as an example.
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### ~
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* Have fun reviewing your seismograph data and analyzing the acceleration with Excel.
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* The first person and second person take shaking or moving the micor:bit in any 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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