1. Using the BBC micro:bit for Home Security
Further developing and improving the micro:bit security system

2. Design Brief Situation
Homeowners worry about the potential for burglary. A good security system can keep their home safe from unwelcome intruders.
Brief
Using the BBC micro:bit, create a working door access security system. The system must use sensors to detect an intruder and sound an alarm when this happens. It must also be possible for the homeowner to reset the system as needed.
Teacher may wish to recap the original brief before continuing with this activity.

3. Piezo sounder or buzzer
Systems Diagram
INPUT
PROCESS
OUTPUT
Movement sensor
BBC
micro:bit
Piezo sounder or buzzer
Door opening
Alarm sound
Teacher may wish to recap from previous activity.
Reset switch
A systems or block diagram shows the layout of the system to be created. The blocks represent the physical parts of the system and the arrows represent signals.
Push

4. Developing your Program Further
You are now going to develop and improve your alarm system.
Try to make at least two improvements to your system based on what would deter burglars the most.
Think about any extra inputs or outputs that you could add.
Improve the program as needed.
Suggestions for what improvements students could make are contained in the teacher lesson plan document, but they should try to identify their own.