Boardoza ULN2003A Unipolar Stepper Motor Driver Breakout Board

The Boardoza ULN2003A Stepper Motor Driver Breakout Board is a four-channel motor control board based on the Texas Instruments ULN2003ADR Darlington transistor array. It supports a unipolar stepper motor, four unidirectional DC motors or two bidirectional DC motors. For unipolar stepper applications, a host microcontroller controls direction and speed by applying full-step or half-step patterns to IN1–IN4.

The outputs can also switch relay coils, solenoids and lamps. Four output indicator LEDs show driver activation, while integrated flyback clamp diodes provide an inductive-current return path to VCC. A power indicator, supply decoupling capacitors and a supply selection header support integration into motor control projects. This documentation covers a nominal 5 V supply configuration.