ULN2003 Driver Module - 5V-12V Stepper Motor Controller Board for Arduino & Raspberry Pi

Product Description The ULN2003 Stepper Motor Driver Board is a compact and efficient solution for controlling small 4-phase 5-wire stepper motors, such as the widely used 28BYJ-48. At its core is the ULN2003A high-voltage, high-current Darlington transistor array, which allows a low-power microcontroller to drive high-current inductive loads. The board features a standardized 5-pin XH-series connector for plug-and-play motor connection and a 4-pin header for easy interfacing with Arduino, ESP32, or Raspberry Pi. With its integrated status LEDs, users can visually monitor the step sequence in real-time, making it an excellent choice for robotics, automated blinds, and educational mechatronics projects.

Key Features

• Darlington Array Efficiency: Utilizes seven Silicon NPN Darlington pairs, capable of handling high-voltage outputs and large peak currents.

• Real-time Monitoring: Equipped with four onboard LEDs (A, B, C, D) that blink according to the pulse sequence, simplifying code debugging.

• Direct Motor Connection: Includes a pre-soldered 5-pin socket specifically designed to fit the standard 28BYJ-48 stepper motor connector.

• Integrated Protection: Features internal clamp diodes for inductive load switching, protecting your microcontroller from back-EMF spikes.

• Wide Voltage Range: Supports motor power supplies from 5V up to 12V, allowing flexibility for different motor torque requirements

Technical Details

• Internal Circuitry: Each channel consists of a Darlington pair with a high-voltage output and common-cathode clamp diodes.

• Current Handling: Capable of 500mA continuous current per channel, with peak currents reaching up to 600mA.

• Logic Compatibility: Resistor-equipped inputs allow direct connection to 3.3V (CMOS) and 5V (TTL) logic levels without external components.

• Inductive Kickback Protection: Integrated suppression diodes eliminate the need for external flyback diodes when driving motors or relays.

• Power Input Pins: Dedicated VCC and GND pins for the motor power supply, separate from the microcontroller's logic power.

• Parallel Capability: Outputs can be paralleled for higher current requirements if necessary for custom inductive loads.

• Input Impedance: High input impedance reduces the load on the microcontroller's GPIO pins, ensuring stable operation.

• Phase Sequence Support: Supports 4-phase, 5-wire motors in both half-step and full-step operation modes.

• Mounting Ease: Includes a fixed mounting hole for secure installation within project chassis or 3D-printed enclosures.

• Compact Form Factor: The narrow PCB design saves valuable space in high-density electronics assemblies.

• Heat Dissipation: Perforated board design and high-quality traces help manage thermal loads during continuous stepping.

• Standard Pitch: Features 2.54mm (0.1") pitch headers, making it fully compatible with standard jumper wires and breadboards.

• Switching Speed: High-speed switching capability suitable for precision micro-stepping applications.

• Operating Temperature: Rated for industrial temperature ranges, ensuring reliability in varying environmental conditions.

• Modular Design: Can be easily daisy-chained or used in multi-axis configurations for CNC or robotic arm projects.