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docs/lessons/seismograph.md
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docs/lessons/seismograph.md
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# Seismograph Lesson
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Build a seismograph with household materials
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## Topic
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Acceleration & Analog Read Pin
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## Quick Links
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* [activity](/lessons/seismograph/activity)
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* [challenge](/lessons/seismograph/challenges)
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## Prior learning/place of lesson in scheme of work
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Learn how to **show LEDs** to turn on a LED light pattern on the LED screen. We will be learning basic comments such as show LEDs and pause.
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## Documentation
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```cards
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basic.forever(() => {
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});
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led.plotBarGraph(input.acceleration(Dimension.Strength) - 1023, 0);
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led.plotBarGraph(pins.analogReadPin(AnalogPin.P0), 0);
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```
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## Objectives
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* learn how to repeat code forever in the background
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* learn how to display a vertical bar graph based on the value.
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* learn how to return the sum of the two numbers
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* learn how to get acceleration value in milli-gravitys
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* learn how to read the connector value as analog as a value comprised between 0 and 1023
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docs/lessons/seismograph/activity.md
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docs/lessons/seismograph/activity.md
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# 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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## What you'll need:
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* micro:bit
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* USB cable
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* Scissors
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* Glue gun
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* String
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* Cup (Plastic or Paper)
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* Magnet
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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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1. Setup Cup: Use scissors to cut a usable window on the cup, which will be a square sized hole at the lid side of the cup. Use scissors to create a small hole in the center of the base of the cup.
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2. Fasten Magnet: Fasten end of the string to the magnet with glue
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3. Secure String: Fasten string to base of the cup and hang the remaining string outside the base of the cup.
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### ~avatar avatar
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Seismograph built, let's code!
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### ~
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4. Go to Codemicrobit.com
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Click or tap Create Code
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Click or tap Block Editor
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### ~
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5.
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We will measure `acceleration (mg)` in terms of strength. Get the acceleration value (milli g-force), as measured in strength.
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```blocks
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input.acceleration(Dimension.Strength);
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```
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### ~
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6.
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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 based on strength.
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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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7.
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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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8.
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Notice that making vibrating the object below the micro:bit changes the values and the line appears as a wave to display the value of the strength as measured in milli-gravities. By making the object below the micro:bit vibrate, you will observe changing values of the micro:bit. Also, the LEDs shown on the Bar Graph fluctates based on the movement of the micro:bit strength.
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NOTE: The black color reflects the micro:bit device.
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### ~
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9.
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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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10.
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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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10.
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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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### ~
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11.
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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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12.
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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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13.
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* Connect a micro:bit to your computer using your USB cable; compile; and repeat this experiment by vibrating the micro:bit. Then chart the data on Excel.
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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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94
docs/lessons/seismograph/challenge.md
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docs/lessons/seismograph/challenge.md
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# Challenge
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### ~avatar avatar
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Welcome! The activity will teach you how to use 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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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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```blocks
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radio.sendNumber(input.acceleration(Dimension.X));
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```
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### ~
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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.
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```blocks
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basic.forever(() => {
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radio.sendNumber(input.acceleration(Dimension.X));
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});
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```
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### ~
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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`.
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```blocks
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basic.forever(() => {
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radio.sendNumber(input.acceleration(Dimension.X))
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})
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radio.onDataReceived(() => {
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})
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```
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### ~
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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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```blocks
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basic.forever(() => {
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radio.sendNumber(input.acceleration(Dimension.X))
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})
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radio.onDataReceived(() => {
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led.plotBarGraph(radio.receiveNumber(), 1023)
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})
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```
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### ~
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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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### ~
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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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### ~
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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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