Online real-time simulator for building, testing, and debugging embedded systems and microcontroller circuits, providing immediate feedback on electronic designs.

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Scratchboard is for electronics students, makers, and embedded-systems developers who want to try circuit designs or Arduino code before using physical hardware. In a browser-based workspace, you can arrange electronic components, connect them into a circuit, and run a simulation to see how the design behaves. The simulator supports Arduino C++ projects on an emulated ATmega328P, with simulated inputs and outputs such as GPIO, PWM, UART, and I2C. It also analyzes basic analog circuits, showing values such as node voltage, current, and power. Use it to explore digital logic, test a microcontroller sketch with components such as LEDs or sensors, or check a circuit idea before building it. Scratchboard is suited to learning and early-stage testing; its simulations do not replace testing a finished design on real hardware.

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