158 lines
6.0 KiB
Markdown
158 lines
6.0 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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## 8.
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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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Click or tap the compile button for the seismograph program to run the program on the micro:bit.
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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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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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### ~
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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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