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Output

The program uses a variable called
“direction” to store a random number.

• Variables store numbers or values that
can change in a computer program.

• Shake the micro:bit to set “direction” to

a random number between one and three.
• The program then uses selection and
comparison logic blocks to test the value

of the variable.

• If “direction” is equal to 1, then an arrow pointing north shows on the
micro:bit’s LED display. If “direction” is equal to 2, then the arrow points
east. Otherwise, the arrow points west.

• To make the battery last longer, the program pauses for half a second after

the arrow appears then clears the screen.

Concepts

1. Direction Detection using Accelerometer: You will learn how the micro:bit’s

accelerometer detects tilts and movements in different directions. They will
understand how devices sense motion and use this information to trigger an

output.
2. Conditional Logic in Programming: You will explore how to use “if-else”

logic to create conditions for displaying specific arrow directions. For
example, if the micro:bit is tilted to the right, a right-facing arrow will blink,

reinforcing their understanding of logic-based decisions in programming.
3. Visual Output on LED Grid: You will learn how to control the LED display by

programming the micro:bit to show different arrow symbols that represent
the direction detected by the accelerometer. This concept connects to visual

representation in programming.

Observations

In the Direction Blinking Arrow using Micro:bit activity, you will observe how
the micro:bit responds to tilting in various directions. When the micro:bit is

tilted to the right, a blinking right arrow appears, and when tilted to the left, a

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