🧮 Stepper driver Vref current calculator (A4988 / DRV8825 / TMC)

Set the driver type and desired motor coil current — the calculator shows the exact Vref voltage to dial in on the tiny trim-pot. Watch the SVG multimeter reading and pot indicator update live. Covers A4988, DRV8825, and TMC2209 with board-specific Rsense options.