Alarm System 警報裝置 (from Electronics Pack)

single model from pack


Product Description

As soon as the door is opened, the red light (LED) starts flashing. When the door is closed, the LED continues to flash. The LED goes out only when another push button (for arming the alarm system) is pressed.

You can construct a real burglar alarm with the special program. With it you can even protect the door to your room to prevent unauthorized access.

Build the model using the assembly instructions and connect the cables according to the circuit diagram.



  • All model parts can be reused and recycled for other projets and student's creative pieces.    fischertechnik is made in Germany with quality and precision.
  • No soldering.  Ideal for all ages, promote problem solving, changes on the fly as debugging and adjustment can be done instantly.    All works can be done to perfection as even the smallest adjustment can be accommodated, thanks to over 580+  mechanical/structural and electronic blocks offered by fischertechnik.


Part 1 - micro:bit block commands used in the Alarm System Model

To achieve fluency and competency in micro:bit coding, you really need to get a thorough understanding of each of the block catagories to be used in the Alarm System Model (see part 2 below for the full code).    Fortunately, all the reference guides are available on the BBC micro:bit web site for you to get a deeper and more comprehensive understanding and mastery.

Through this fischertechnik alarm system model, you can learn, practise, build fluency and confidence in coding.

The Alarm system  Model uses the following micro:bit blocks.  You can click to lean more about each of the block catagories.  The links bring you directly to the respective part of the BBC micro:bit reference document site, where live codes are included for you to understand, try, and download:



Part 2   The "live"  Alarm system Code  - Understand, Edit and Download

  The following code has used all the mentioned blocks in Part 1 above.    


Comments In English, click the " ? " on block to find out the comment (meaning) of the block code.

  • If you read this page on a computer with wider screen size, you will be able to see the micro:bit simulator that is fully clickable.
  • If you cannot see the code, such as on a mobile phone, please  click this link instead.
  • Click   to open the code on the micro:bit website for further editing and modification.
  • Click   to download this code to your micro:bit for immediate use or to save on your computer.     






The followings are listed according to the order options


Option 1.  Alarm system model parts and support resources only  - HK$ 589  per set

The following are provided under the Ventilating Fan model pack 

 Item  Quantity
Output Motor with Gear Box 1
Green light (light, light holder, green cap) 1
Red Light (light, light holder, red cap) 1
Structure/Circuit cable 300 mm length
Structure/Circuit mini screw driver 1
Structure/Circuit building blocks  575
Support assembly guide (PDF) 1


full micro:bit code for the model 



Option 2:

Alarm system Fan model parts and support resources + Motor Driver Board    HK$699


Option 3: 

Alarm system parts and support resources + Motor Driver Board  + the BBC micro:bit    HK$ 822



fischertechnk STEM II 零件分類及介紹    (Barrier is 1 of the 12 models from STEM II)


fischertechnik full part list  (fischertechnk has close to 580 unique mechanical, structural, electronic parts for use by students, teachers, hobbist, engineers, from around the world).

You can order individual parts from us directly.    Contact us



The motor driver board comes with the 4 x AA battery case.  

For long lasting power supply, please order the fischertechnik rechargeable battery - the Accu Set




Order options
HK$ 589.00

Model parts only