Week 1: What Makes Something a Robot?

Session length: 60-75 minutes

Learning purpose

Students figure out what actually makes something a robot instead of just a machine. They learn that a robot senses the world, decides what to do, and then acts - the input, processing, output loop - and that a program is what makes it repeat the job on its own. They investigate real devices, map one as a robot system, and sketch a helpful robot of their own.

Expected student outcomes

By the end of this week, students can:

Explain what makes something a robot rather than a simple machine
Describe the input, processing, output loop in a real device
Explain the role of the controller as the robot's brain
Identify the sensors and actuators in a robot
Tell the difference between autonomous and remote-controlled systems
Design a robot system for a useful task
Sketch a helpful robot and label its inputs, processing, and outputs

Suggested pacing

About 60-75 minutes. Adjust to your group - these are guides, not limits.

Step	Focus	Minutes
What makes a robot a robot	Sense, decide, act, and the input-processing-output loop.	15 min
Robot-or-Not investigation	Sort real devices using the sense/decide/act test.	15 min
Robot System Mapper	Map one device's input, processing, output, and parts.	15 min
Helpful Robot design challenge	Sketch a helper robot with labeled parts.	15 min
Knowledge check	Five questions on robots, parts, and the loop.	8 min
Reflection	Write about machines vs robots and a helper you'd want.	7 min

Before you start

Set up

Gather three or four everyday devices that range from clearly-a-machine to clearly-a-robot.
Print the Robot System Mapper worksheet, one per student or pair.
If using kits, charge them and pre-load a simple sensor behavior; if using the simulator, open it on each device.

Prepare ahead

Try the robot-or-not sort yourself so you can guide borderline cases.
Have a robot vacuum or automatic-door example ready as a familiar autonomous system.

Materials

Three or four everyday devices to investigate (toy, phone, flashlight, robot vacuum, etc.)(Kit, Simulator, Unplugged)
Robot System Mapper worksheet (printable)(Kit, Simulator, Unplugged)
Pencil and paper for sketching(Kit, Simulator, Unplugged)
A programmable robot kit, if available(Kit)
Computer or tablet with a browser(Simulator)
Recycled boxes, markers, and craft supplies for a robot modelOptional(Unplugged)

Safety

cautionKeep fingers, hair, and loose clothing away from moving wheels and gears on kit robots.(Kit)
cautionDo not open or take apart real appliances; investigate by watching them work.(Unplugged)
infoTake a short screen break if your eyes get tired using the simulator.(Simulator)

Full safety briefing

Review these once with your group. They apply across the whole course; the notes above are what matters most this week.

Batteries and circuitsKit

Use only appropriate low-voltage educational equipment - no wall outlets and no household batteries wired by hand.
Never connect a battery's two terminals directly to each other.
Stop right away if a motor, wire, or battery becomes hot, and tell an adult.
Disconnect the power before changing wheels, motors, or other mechanical parts.

Motors and gearsKit

Keep fingers, hair, jewelry, sleeves, and loose clothing away from moving gears and wheels.
Do not force a stalled motor that has stopped turning - switch it off and find out why.
Make sure moving parts are secured before you run a test.

Moving robots

Test on the floor, not on a table where the robot could drive off an edge.
Keep robots away from stairs, roads, water, pets, and people's feet.
Use a clear, open test area.
Always include a safe-stop behavior so the robot halts when the job is done or something is in the way.

Tools and materialsKit, Unplugged

Ask an adult for help with cutting or any sharp tools.
Use safe classroom materials - no sharp, toxic, or breakable items.
Never launch or swing an attachment toward a person.

Running the session

1.Start with the sense/decide/act test and the input-processing-output loop before any devices come out.
2.Run the Robot-or-Not investigation, pushing students to justify each placement.
3.Model one Robot System Mapper together, then let pairs map a second device.
4.End with the Helpful Robot sketch and the knowledge check.

Common misconceptions

'Anything electronic is a robot' - a flashlight is electronic but can't decide.
'If it moves, it's a robot' - a wind-up toy moves but doesn't sense or decide.
Mixing up sensor and actuator - one measures, one acts.

Questions to ask

How does this device know when to act?
What would happen if we removed its sensor?
Is a person deciding here, or is the device deciding?

Classroom & group adaptations

Make it easier

Use picture cards of devices and sort them as a group instead of mapping the full loop.

Make it harder

Have students map a device that can be both autonomous and remote-controlled, and explain when it is each.

Groups & whole class

In pairs or small groups, give each student a role that rotates - driver (builds or types), navigator (reads the plan), and recorder (fills the worksheet) - so everyone participates. For a whole-class demo, run one shared robot or simulator on the board, have students predict together, then let groups repeat it on their own path. Groups can also mix paths: one builds on the kit while another checks the same idea in the simulator or unplugged, then they compare results.

Hardware and no-hardware notes

Every activity this week runs three ways - all three teach the same core idea, so pick whichever fits your room. No specific product is required.

Kit

Three or four everyday devices to investigate (toy, phone, flashlight, robot vacuum, etc.)
Robot System Mapper worksheet (printable)
Pencil and paper for sketching
A programmable robot kit, if available

Simulator

Three or four everyday devices to investigate (toy, phone, flashlight, robot vacuum, etc.)
Robot System Mapper worksheet (printable)
Pencil and paper for sketching
Computer or tablet with a browser

Unplugged

Three or four everyday devices to investigate (toy, phone, flashlight, robot vacuum, etc.)
Robot System Mapper worksheet (printable)
Pencil and paper for sketching
Recycled boxes, markers, and craft supplies for a robot model

Troubleshooting

Common problems from this week's activities and what to try.

The robot just drives straight and never reactsKitTry: Load a behavior that uses a sensor (like stop-at-wall) so students can see it decide.
Not sure what the simulator robot is sensingSimulatorTry: Point out the sensor read-out in the sim and match it to the robot's action.
Everything looks like 'just a machine'UnpluggedTry: Ask which device changes what it does without a person - that is the sensing-and-deciding clue.
Can't tell the sensor from the actuatorKitTry: A sensor measures; an actuator moves. Ask which part causes motion.
Processing box is blankSimulatorTry: Write the rule as 'if the sensor says X, then do Y'.
Not sure what the controller isUnpluggedTry: It is the hidden 'brain' that gets the sensor's message and tells the actuator to act.
The robot has no sensorKitTry: Ask: how does it know when to act? That is where a sensor goes.
The idea is too big to drawSimulatorTry: Shrink it to one job the robot does on one small grid.
Model has no moving partUnpluggedTry: Add a flap, wheel, or arm to stand in for the actuator.

Knowledge-check answer key

Answers are shown here for the adult only - the student worksheet keeps them hidden.

1. Decide what kind of system this is.
Correct answer: A remote-controlled machine
Why: A person decides every move through the handset, so it is remote-controlled, not an autonomous robot.
2. Which of these are actuators? Select all that apply.
Correct answer: A motor that spins a wheel; A buzzer that makes a sound; A light the robot turns on
Why: Actuators are the parts that act - motors, buzzers, and lights. A sensor only measures, so it is not an actuator.
3. What makes something a robot instead of just a machine?
Correct answer: It can sense, decide, and act on its own
Why: A robot senses the world, decides what to do, and acts - and it does this on its own by following a program.
4. In the input-processing-output loop, what is the 'processing' step?
Correct answer: The controller decides what to do with the input
Why: Processing is the 'thinking' step: the controller takes the input and decides which output to make.
5. Which part of a robot is the actuator?
Correct answer: The motor that turns the wheel
Why: Actuators are the parts that act - motors, wheels, grippers, buzzers, and lights.
6. A robot vacuum cleans a room by itself with no one steering it. This is an example of a system that is:
Correct answer: Autonomous
Why: Autonomous systems use their own program and sensors to decide, with no person steering.
7. Why does a robot need a program?
Correct answer: So it can do a job the same way on its own, again and again
Why: A program is the list of instructions the controller follows so the robot can repeat a job by itself.