28BYJ-48 5V DC Stepper Motor with ULN2003 Driver Module

Overview

The 28BYJ-48 5V stepper motor paired with the ULN2003 driver module is a popular, low-cost motion control solution for hobbyists, makers, and engineers. This unipolar 5V stepper provides precise, repeatable motion with a compact footprint and easy interfacing to microcontrollers such as Arduino and Raspberry Pi.

Key Advantages

• Accurate position control with small step angles for repeatable motion
• Easy integration using the included ULN2003 driver board and 5-pin connector
• Indicator LEDs on the driver board for visual coil activation feedback
• Low-voltage 5V operation suitable for most development boards and battery-powered projects

Features

Motor Features

• Type: Unipolar 5V DC stepper motor (28BYJ-48)
• Configuration: Four-phase, 5-wire design
• Step angle: 5.625° per step with internal 1/64 reduction ratio for finer motion
• Rated torque: 34.3 mN·m
• Shaft: Single flat shaft for secure mounting

Driver Module Features (ULN2003)

• Driver IC: ULN2003A Darlington transistor array for safe coil switching
• Input voltage: 5V DC compatible with common microcontrollers
• Control pins: IN1 to IN4 for motor coil activation
• Indicators: 4 LEDs, one per motor phase for troubleshooting and status
• Motor connector: Screw terminal output for robust wiring

Specifications

Stepper Motor (28BYJ-48)

• Type: Unipolar 5V DC stepper motor
• Voltage: 5V DC
• Step Angle: 5.625° per step (with 1/64 internal reduction)
• Reduction Ratio: 1/64
• Number of Phases: 4
• Rated Torque: 34.3 mN·m
• Shaft Type: Single flat shaft
• Connector: 5-pin JST / screw terminal via ULN2003 board

Driver Module (ULN2003)

• Input Voltage: 5V DC
• IC: ULN2003A Darlington transistor array
• Indicators: 4 LEDs (one per motor phase)
• Interface: IN1 to IN4 control pins
• Output Type: Terminal block for motor connection

Compatibility and Wiring

The module is plug-and-play with Arduino, Raspberry Pi, and most microcontrollers. Connect the motor 5-pin connector to the ULN2003 board, wire the module VCC to 5V and GND to ground, then use IN1-IN4 to control coils from your microcontroller’s GPIO pins. Use a separate 5V supply for higher current needs to avoid resetting the controller.

Driving Modes and Control

• Full-step: Maximum torque, simpler control sequence.
• Half-step: Better resolution and smoother motion, common for precise position control.
• Microstepping: Not supported natively by ULN2003; for finer microstepping consider a dedicated microstepping driver.

Applications

• Robotics and automation systems
• Camera pan and tilt platforms
• Small CNC machines and 3D printer mechanisms
• Smart curtain or door position control
• DIY motion control and educational projects
• Learning stepper motor programming with Arduino or Raspberry Pi

Package Contents

• 1 x 28BYJ-48 5V stepper motor (4-phase, 5-wire)
• 1 x ULN2003 driver module with indicator LEDs
• 1 x 5-pin connector cable (if provided by vendor)

Tips and Best Practices

• Use a stable 5V supply rated for the motor current to avoid undervoltage issues.
• Add a flyback diode or rely on the ULN2003 internal suppression for inductive spikes.
• Start with half-step mode for smoother movement; increase speed gradually to avoid missed steps.
• Secure the flat shaft with a matching set-screw pulley or adapter to prevent slippage.

Note

Images are for illustration purposes only. Verify connector type and included accessories with the vendor before ordering.