C4T free concept simulator
Circuit and Robot Concept Simulator
Explore course concepts through adjustable values, prediction, deterministic feedback, and an explanatory trace.
This free concept simulator supports guided prediction, comparison, and reflection. It does not execute code, train models, run databases, create repositories, or replace full project software. The course's always-free pathway also explains how to create project files with freely installable or open tools; paid services and physical hardware remain optional.
Free concept simulator
Circuit and Robot Concept Simulator
Explore course concepts through adjustable values, prediction, deterministic feedback, and an explanatory trace.
Safety note: This toy calculation assumes one virtual LED with a 2 V forward-voltage estimate and a modeled 1–20 mA operating band. It is not a component rating, GPIO-pin limit, wiring guide, or guarantee of safety. For physical work, use the exact LED and board datasheets, disconnect power before rewiring, use appropriate current limiting and driver circuitry, never connect to household or mains voltage, and work with qualified instructor or adult supervision.
1 · Predict
Will this specified virtual LED be off, within its modeled operating range, or above that modeled range?
2 · Explore
Virtual battery or controller voltage.
The resistor limiting LED current.
3 · Inspect the result
Ready to simulate
Choose a prediction, adjust the controls, and run the lab. The displayed result comes from the simplified values and rules on this page.
Courses using this free concept lab
Lab ID: robotics-lab. The guided controls run in your browser; this page does not execute course code or connect to external hardware, model, database, or deployment services.