Test Arduino circuits and code before soldering a single component
A software environment for experimenting with circuits, Arduino microcontrollers and component behavior before building hardware, for education and prototyping.
Learning electronics and microcontroller programming usually depends on physical hardware: boards, components, wiring and measurement tools. For students and hobbyists, this equipment is not always easy to obtain, and a simple wiring mistake can damage components.
In early prototyping, testing ideas on real hardware is slow, and finding out whether a fault lies in the code or in the circuit can take a lot of time. A simulation environment that shows circuit behavior and program execution side by side can make this cycle shorter and less risky.
The simulator is designed as a software environment in which users place components such as LEDs, resistors, push buttons and sensors on a workspace, connect them to the pins of a virtual Arduino board and run their program.
The core consists of two main parts: a microcontroller model that tracks program execution, the state of digital and analog pins and serial output, and a simplified circuit model that represents component behavior based on voltage levels and connections. The aim is educational accuracy and understandable behavior, not a full replacement for professional analog circuit simulators.
Graphical interface for placing components, wiring them and setting their properties.
Executes the Arduino program and manages digital pins, analog inputs and serial communication.
Simplified behavioral models for LEDs, resistors, buttons, potentiometers and sensors.
Synchronizes code execution with circuit state updates in discrete time steps.
Displays component states, pin values and the program serial output.
The most important decision in this project was choosing the right level of accuracy. A complete, precise analog simulation is complex and slow, and it is not necessary for teaching purposes. The circuit is therefore represented by a simplified behavioral model: an LED lights up depending on its orientation and the presence of a current-limiting resistor, and an analog input returns a value within the range of the analog-to-digital converter. This level of detail is sufficient for understanding circuit logic and testing code.
The second decision was to keep the microcontroller model separate from the circuit model. The two parts communicate only through pin states, so new components can be added without changing the program execution logic.
In each time step, the simulation core executes part of the program, passes pin state changes to the circuit model and feeds the components' responses, such as a button state or a sensor reading, back into the microcontroller inputs. Serial output appears in a separate window so users can debug their program much as they would with a real board.
Possible extensions include a larger component library, displays and motors, ready-made exercise scenarios, and simulating the transmission of sensor data to an IoT platform. The latter builds a bridge between electronics education and the design of industrial IoT systems.
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Let’s discuss how this approach could be adapted to your equipment and requirements.
