diff --git a/docs/lessons/charting/activity.md b/docs/lessons/charting/activity.md index fb60ee2c..b767a0f0 100644 --- a/docs/lessons/charting/activity.md +++ b/docs/lessons/charting/activity.md @@ -2,20 +2,17 @@ Measure the acceleration on the micro:bit in the "z" direction. -### ~avatar +### ~avatar avatar -``` Welcome! This activity will teach how to use the 1st micro:bit to chart the second micro:bit's acceleration in the "x" direction. 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. ```blocks radio.sendNumber(input.acceleration(Dimension.X)); ``` - +### ~ 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. ```blocks @@ -25,7 +22,7 @@ basic.forever(() => { ``` - +### ~ We want to register code to run when a packet is received over radio. We can implement this code by adding `on data received`. ```blocks @@ -36,7 +33,7 @@ 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. ```blocks @@ -48,21 +45,25 @@ radio.onDataReceived(() => { }) ``` - +### ~ 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. ![](/static/mb/acc.png) +### ~ 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. ![](/static/mb/acc2.png) +### ~ Finally, you must open the Excel CSV file by clicking on the data.xls file that was downloaded to Downloads Folder. ![](/static/mb/csv.png) +### ~ 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.