5.6 KiB
charting activity
Measure the acceleration on the micro:bit in the "x" direction.
~avatar avatar
Welcome! This activity will teach how to use the micro:bit to chart the second micro:bit's acceleration in the "x" direction. Let's get started!
~
Let's measure acceleration (mg)
in the "x" direction. Get the acceleration value (milli g-force), in one of three specified dimensions.
input.acceleration(Dimension.X)
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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.
basic.forever(() => {
led.plotBarGraph(input.acceleration(Dimension.X), 0)
})
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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
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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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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Have fun reviewing your simulation and analyze the acceleration by chart the Excel data using Excel.
- Connect the first micro:bit to your computer using your USB cable and run the charting script on it.
~avatar avatar
Welcome! The activity will teach you how to use the acceleration of the 1st micro:bit and return the acceleration value in a visual graphing display using the 2nd micro:bit. Let's get started!
~
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.
radio.sendNumber(input.acceleration(Dimension.X));
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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.
basic.forever(() => {
radio.sendNumber(input.acceleration(Dimension.X));
});
~
We want to register code to run when a packet is received over radio. We can implement this code by adding on data received
.
basic.forever(() => {
radio.sendNumber(input.acceleration(Dimension.X))
})
radio.onDataReceived(() => {
})
~
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.
basic.forever(() => {
radio.sendNumber(input.acceleration(Dimension.X))
})
radio.onDataReceived(() => {
led.plotBarGraph(radio.receiveNumber(), 1023)
})
~
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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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
~
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.
~
Finally, you must open the Excel CSV file by clicking on the data.xls file that was downloaded to Downloads Folder.
~
Have fun reviewing your simulation and analyze the acceleration by chart the Excel data using Excel.
- Connect the first micro:bit to your computer using your USB cable and run the charting script on it.
- Connect the second micro:bit to your computer using your USB cable and run the charting script on it.
- 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!
- Review and analyze the actual micro:bit device acceleration data on Excel