Smart Room Security Rover
The Grades 3-4 curriculum includes a miniature patrol rover with an approach alarm. It is a classroom model for learning sensing and decisions, not a home-security product. Children investigate how a machine can notice an object without understanding what that object is.
What the project does
A rover patrols a small test area and sounds an alarm when a nearby object crosses a chosen distance. Children first predict the response, then move an object closer and farther away. This creates a practical distinction between measuring a distance and interpreting whether something is a threat.
Grade, tools and components
This pathway is aimed at Grades 3-4, approximately ages 8-9. Its existing tools include BBC Micro:bit v2, ultrasonic sonar, servo motors, infrared sensors and MakeCode Blocks. A two-wheel chassis, battery supply and alarm output complete the model as configured by the mentor. Wiring and power connections are supervised.
Programming concepts
A loop repeatedly reads the distance; an if-else condition decides whether to continue or raise an alarm. A variable stores the current measurement or an event count. Children can describe these instructions in everyday language before arranging blocks, which helps separate reasoning from tool familiarity.
Testing should include an object just inside and just outside the threshold, an angled surface and an empty path. An unreliable alarm may come from a poor measurement rather than a wrong condition. Students record the test conditions so they can compare results fairly.
What parents can ask
Ask the learner to explain which number triggers the alarm, show a situation that gives a surprising reading, and demonstrate one change that improved behaviour. These explanations reveal more than watching a successful patrol. The project prepares students for more independent circuits and typed code in Grades 5-6. Genuine project media is not yet available because the centre is preparing to open.