Designed specifically for unipolar stepper motors like the 28BYJ-48, the ULN2003 driver board incorporates a high-voltage, high-current Darlington transistor array. It features a simple 5-pin JST-XH connector for quick plug-and-play motor connection and 4 onboard logic status LEDs (A, B, C, D) that provide immediate visual feedback for active coil phases. It operates as an interface between low-power microcontrollers (3.3V/5V logic) and higher-current load outputs, keeping your logic pins protected while simplifying stepping sequences.