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Activity

Magic 8-ball

Beginner | MakeCode, Python | Accelerometer, LED display | Randomisation, Selection

Step 1: Make it

What is it?

Recreate a classic toy from the 1950s with your micro:bit and customise it to make it your own.

micro:bit being shaken and showing a tick on its LED display next to a magic 8 ball toy

How it works

  • A Magic 8-ball is a toy invented in the USA in the 1950s. Shaped like an oversized pool ball, you ask it a question like ‘will I be rich and famous one day?’, shake the ball and one of 20 different answers randomly appear in a window. Answers can be positive, negative - or somewhere in between.
  • This program recreates a Magic 8-ball using the micro:bit’s accelerometer, its ability to make random numbers and its LED display output to show a tick for yes, a cross for no or a ‘meh’ face for ‘not sure’.
  • The program generates a random number between 1 and 3 then uses if… then… else… if… statements to make different symbols appear depending on the number. This is known as selection.
  • If the number is 3, it shows a tick for ‘yes’. If the number is 2, it shows a cross for ‘no’.
  • The program doesn’t need to check if the number is 1, because if it’s not 3 or 2, it must be 1, in which case it shows a ‘meh’ face for ‘not sure.’

What you need

  • micro:bit (or MakeCode simulator)
  • MakeCode or Python editor
  • battery pack (optional)
  • some questions to ask your micro:bit

Step 2: Code it

Step 3: Improve it

  • Make the image vanish after a few seconds.
  • Make the micro:bit show different cryptic answers when you shake it, instead of pictures. It could say ‘I am not sure’ or ‘That remains to be seen’.
  • Here’s another way of making a Magic 8-ball using Python.