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Case 17: Alarm Device

Introduction​

This is an alarm device. Press button A to make the red LED light on and flash, and the buzzer will be activated. Press button A again to cancel the alarm.

Quick to Start​

Materials​

Nezha expansion board × 1

micro:bit × 1

LED-red × 1

RJ11 wires × 1

Bricks × n

Tips: You may need to purchase Nezha Inventor's Kit if you want all the above compoents.

Connection Diagram​

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

Assembly Video​

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

Assembly Steps​

MakeCode Programming​

Step 1​

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

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.

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:​

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

You may also downoad it directly below:

Result​

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