Electronics 01
How to Set Vref on A4988 and TMC2209 Stepper Drivers
Vref = 8 × Rs × I on an A4988, 5 × Rs × I on a DRV8825, and about 1.41 × the RMS current on a TMC2209 with 0.110 Ω resistors. How to read the sense resistor, why TMC numbers are RMS, and how to measure the pot.