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Introduction to Virtual Breadboard (VBB) Virtual Breadboard (VBB) is a pioneering software simulation tool designed for electronics engineers, embedded system developers, hobbyists, and educators. It allows users to design, simulate, and debug electronic circuits and microcontroller firmware without physical hardware. Version 4.15 represents a specific legacy release that became popular for its stability and accessibility, particularly as a free resource for learning Arduino, PIC, and AVR programming.