Using the library, a designer assembles a tiny universe: MCU pins routed to MS1–MS2–MS3 for microstep selection, STEP pulses sequenced from a timer, and ENABLE tied to a control line. The motor wires — A1/A2 and B1/B2 — attach to the outputs, and Proteus’ simulated motor element responds with torque and position. The oscilloscope displays current ripples shaped by decay settings; the logic analyzer shows phase relationships; a virtual thermometer warns of thermal shutdown if you drive too much current without proper cooling. The library makes that choreography possible, shaping expectations and revealing subtle interactions: an inadequate supply decoupling capacitor leads to voltage sag and skipped steps; an aggressive microstepping rate meets the motor’s inductance, and current never reaches steady values between pulses; the chosen decay mode creates audible frequency components that would, in the real world, translate to copper whining under load.
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