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micro:bit apps

The emotion badge program

Emotion badge program

microcode

The emotion badge program

The emotion badge program consists of four When-Do rules:

  • the When section is the left side of the rule and describes an event, such as the pressing of a button.
  • the Do section is the right side of the rule and describes an action to perform, such as displaying a 5x5 LED image on the micro:bit.

The first two rules fire on the press of the m-A button. The second two rules fire on the press of the m-B button. The first and third rules display animations of happy and sad faces. The second and fourth rules play happy and sad sounds.

The first rule reads as: “When there is press of the m-A button, show two LED images”.

Running the program

You can run the program in one of three ways:

  • use the direction pad to navigate to the green play tile and press d-A
  • press either the m-A or m-B button on the micro:bit
  • press the menu button on the display shield

The micro:bit will indicate the program is running by a quick circular animation on the LED display.

Stopping the program

The program will continue to run until

  • you move to and select the stop tile (to the right of the play tile), or
  • you edit the program

Running without the display shield

If you remove the micro:bit from the shield and power it via battery or USB, the last program you edited in MicroCode will begin to run.

Changing the program

Plugging the micro:bit back into the shield, you can continue to edit the program (it is saved automatically after each edit operation):

  • press the edit button on the home page.
  • now navigate to one of the 5x5 LED images and press the d-A button.
  • use the D-pad to navigate around the 5x5 image;
  • press the d-A button to toggle the selected LED on/off;
  • change the image to your liking
  • finally, press the d-B button to exit the image editor.

Now run your modified program!

Let’s do one more edit:

  • move the cursor to the empty space after a LED image
  • press the d-A button and press it a second time
  • edit the image as before and press the d-B button

You have added a new image to the animation sequence.