Step 1: Make it
What is it?
Make a compass that makes a sound when you're pointing North to make it more accessible and useful.
What you'll learn
- How to use compass readings from the micro:bit's magnetometer sensor
- How to use variables, selection, comparisons and logic to trigger events when sensor readings fall in a range of numbers
How it works
- A loop keeps the micro:bit checking which direction you're facing in. It stores this in a variable called direction.
- If the direction is between 355 and 5 degrees, you are facing North so it shows an N on the LED display and makes a beeping sound.
- If you have a new micro:bit you can hear the sound on the built-in speaker, otherwise you can connect headphones to pin 0 and GND.
- If you're not facing North it clears the display and stops the sound.
- You can also press button A to see a compass reading on the LED display if you're not facing North.
- The first time you use a compass project on your micro:bit, you’ll probably be asked to play a little game. Tilt the screen to light every LED on the display. This calibrates the compass and makes sure it’s working correctly.
What you need
- A micro:bit
- MakeCode or Python editor
- battery pack (optional)
Step 2: Code it
Step 3: Improve it
- Play different notes depending on which way you're facing: South, East or West.
- Add another button press to calibrate the compass again if you think it's not accurate. In MakeCode you'll find the 'calibrate compass' block under Input... more. In Python use
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