Maker Faire learning mission · Ages 8–16
ROB’s Systems Lab
Repair eight imaginary robot missions—including a four-part USB Power Lab—by reasoning about systems, signals, motion, circuits, and safe control. No login, tracking, or robot connection—everything stays in this browser.
Drive ROB in 3D
1ObserveWhat evidence is available?
2ModelHow do the parts connect?
3PredictWhat should happen next?
4TestDoes evidence match?
5ReviseWhat would you change?
The engineering learning loop

Missions 5–8 · USB Power Lab
Turn an old battery toy into a circuit lesson
Practice the whole reasoning chain before touching a real cable: unplug, let a mentor prepare it, isolate unused wires, verify voltage and polarity, match the load, connect while unpowered, and run one bounded test.
Children do not cut live cables. In the real Maker Faire activity, only a mentor cuts and strips a sacrificial, unplugged USB-A cable. Use an approved current-limited 5 V source and toy, remove its batteries, cover every connection, and stop for heat, odor, noise, or damaged insulation.
Mission1 / 8
Evidence points0
Systems detective
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For families and educators
Ask for a claim, evidence, and a limit
After each answer, ask: “What do you predict?”, “What observation supports that?”, and “When might your model stop working?” The goal is not guessing quickly. It is learning to explain.
- Keep activities on paper, in simulation, or in approved current-limited classroom kits.
- USB cable preparation is an unplugged, adult-only tool task; learners predict, identify, measure, connect prepared leads, and explain.
- Never open ROB’s battery, power, drivetrain, actuator, or machine-tool systems.
- An authenticated green connection means identity was proven—not that motion is automatically safe.