Waveshare HAT User Manual page 17

Stepper Motor HAT User Manual
For more details about the current required, please refer to datasheet page12.
The R(isense) on board is 200mR, so we can get that I(chop) = V(xref). V(xref) is
voltage of potentiometer, Ichop is output current. Reduce voltage by clockwise and
anticlockwise to increase the voltage.
The factory setting is compatible with most of stepper motor. However, there are
some motor whose minimum phase current is much larger, in this case, we need to
adjust the potentiometer for properly working.
【Note】
Chip may be damaged if motor works in abnormal states for long time.
Do not turn the potentiometer anticlockwise to maximum, otherwise, the chip will
be damaged after long time using.
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