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Case 12: The Burglar Alarm in Shops


  • After installing the bulglar alarm device in shops, program to send alarms if someone breaks into the shops.


  • Detect the magnet from the magnetic(compass) function on the micro:bit, if the magnet goes far from the micro:bit, program to send alarms and light on the LED.

Note: A piece of magnet requires in this project.


Hardware Connection

Connect the red led to P1 port on IoT:bit.

Software Program

Click "Advanced" in the MakeCode drawer to see more choices.

For programming, we need to add a package: click "Extensions" at the bottom of the MakeCode drawer and search with "iot-environment-kit" in the dialogue box to download it.

Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.


Detect the magnetic intensity in the current field, if the returned value is below the threhold, program to send alarms and flash on the led.



  • If someone breaks into the shop, the device sends alarms and the led keeps flashing.