beanz Magazine

Laser Burglar Alarm

Alan Cleaver on Flickr

Protect your home with micro:bit!

This project will help keep our home safe from intruders and scare our parents / brothers / sisters, all using the power of the micro:bit.


Protect your home! Can we use the power of the micro:bit to keep safe (or our family out of our room?) Well yes we can and this is thanks to something special about the micro:bit.

Unlike the Raspberry Pi, the micro:bit GPIO (General Purpose Input Output) pins feature analog inputs. This means that when a compatible component is connected it returns a voltage, rather than a 0 or 1 (digital input / output). This voltage is controlled by the sensor. For example, a potentiometer will have variable resistance depending on which way it is turned. In this project we shall use a Light Dependant Resistor (LDR) to monitor a light shone upon it, if the light beam is broken then our micro:bit alarm will alert us to an intruder.

In this project we shall learn:

  • How to code with Python
  • How to connect components to the micro:bit
  • How a Light Dependant Resistor works
  • How to generate sound
  • How a loop works
  • How a conditional statement works

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