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Output

In this activity, you will build a
simple robot that uses a micro:bit
to respond to sound. The micro:bit

has a built-in microphone that can
detect sound levels. The robot is
programmed to move or perform

actions (such as stopping, turning,
or accelerating) based on the

intensity of the sound it detects.

Concepts

1. Sound Detection and Response: you will learn how the micro:bit’s
microphone detects sound waves and converts them into digital signals.

This connects to the science topic of sound waves, where you explore how
sound travels and how sensors can detect it. They will understand how a
robot can react to changes in the environment, such as loud or quiet sounds.

2. Programming and Automation: By programming the micro:bit, you will

explore how the robot’s behaviour is controlled by writing code. They will
write simple programs that instruct the robot to perform specific actions
when the sound level changes. This teaches basic programming concepts and

connects to robotics and automation, helping you understand how sensors
and actuators work together in real-world applications.

3. Energy and Motion: you will see how the robot’s movement is powered by
electrical energy from the battery, which is transformed into mechanical

energy to power the motors. They can explore how sound (an environmental
signal) can trigger motion, connecting this to the concept of energy

transformation.

Observations

In the “Building a Simple Robot That Reacts to Sound Using Micro:bit” activity,
you will observe how the robot reacts to different sounds. For example, when
someone claps, the robot might move forward, and when there’s silence, it

could stop, you will notice how sound intensity affects the robot’s behavior

Basic Motor Control and Sensors 117