This board is designed based on Texas Instrument DRV8818 Stepper Motor Controller IC
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The DRV8818 provides an integrated stepper motor driver solution for printers, scanners, and other automated equipment applications. The device has two H-bridge drivers, as well as microstepping indexer logic to control a stepper motor
To set the max current per phase place voltage meter from gnd to REF. Then follow table below to get your desired current by adjusting the Cur pot.