18. Case 17: Alarm Device¶

18.1. Introduction¶

Build an alarm device with the micro:bit.

../../_images/case_17_01.png

18.2. Quick to Start¶

Materials¶

Nezha expansion board × 1

micro:bit × 1

LED-red × 1

RJ11 wires × 1

Bricks × n

../../_images/case_17_02.png

Bricks details¶

../../_images/Bricks_case_17.png

Connection Diagram¶

Connect the red LED to the J1 port on Nezha expansion board.

../../_images/

Bricks Build-up¶

Build a device as the pictures indicate:

../../_images/

Video link:https://youtu.be/bYN6-6PskHQ

18.3. MakeCode Programming¶

Step 1¶

Click “Advanced” in the MakeCode drawer to see more choices.

../../_images/case_01_10.png

We need to add a package for programming. Click “Extensions” in the bottom of the drawer and search with “PlanetX” in the dialogue box to download it.

../../_images/case_01_11.png

Note: If you met a tip indicating that the codebase will be deleted due to incompatibility, you may continue as the tips say or build a new project in the menu.

Step 2¶

Programme as the picture shows:¶

../../_images/case_17_15.png

Link¶

Link: https://makecode.microbit.org/_A4CaHvTuJ7br

You may also downoad it directly below:

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Result¶

Press button A to alarm and the red LED flashes; press it again to stop the alarming and the LED turns off.