Measurement
A value representing part of the world.
Curriculum topic
Sensors
A sensor turns part of the physical world into information a program can inspect.
Why it matters
A small idea that returns in larger systems.
Robots cannot respond intelligently without information. Sensors measure light, distance, motion, temperature, touch, sound, or other signals, but every reading has limits and noise.
Real-world connection
Automatic lights do not see darkness as a person does. They receive a number from a light sensor and compare it with a threshold chosen by a designer.
The connection shows where the idea returns; it does not claim every advanced application is taught in this first topic.
Math and logic kernel
The structure beneath the project.
Threshold
A chosen boundary between responses.
Noise
Small changes or errors in readings.
Sampling
Reading a changing signal repeatedly over time.
Small examples
Make one relationship visible at a time.
Button
A simple two-state sensor: pressed or not pressed.
Distance
Estimate how near an obstacle is.
Light level
Change output when a space becomes darker.
Accelerometer
Measure movement or orientation on a microcontroller.
Program connections
Where this topic appears.
Active now
Robotics
Commands, sensors, simple electronics, simulations, and physical systems organized around Sense, Decide, Act.
Available later
AI & Smart Machines
A future practical and critical program about patterns, predictions, prompts, limits, and human judgment.
Common mistakes
Useful clues, not reasons to stop.
Treating readings as perfect
A system reacts badly to small fluctuations.
Poor threshold
The decision boundary does not match the actual environment.
No calibration
The program assumes every room or device produces the same values.
Confusing sensor and decision
The sensor measures; the code decides what the measurement means.
Lesson and projects
Use the idea inside a working system.
Robotics
Guided Class Project
Button and Buzzer Alarm
Connect a button input to visible and audible outputs, then improve the alarm's state rules.
Open project
Robotics
Guided Class Project
micro:bit Reaction Timer
Measure reaction time, store results, and decide what makes a timing test fair.
Open project
Robotics
Computer Lab Project
Robot Patrol Challenge
Design a patrol that repeats, senses a changed world, and uses feedback to recover.
Open project