ULN2003 Stepper Motor Driver and 28BYJ-48 Stepper Motor

The ULN2003 Stepper Motor Driver and 28BYJ-48 Stepper Motor combo is a popular and affordable stepper motor control solution for beginners and hobbyists. The set includes the 28BYJ-48 unipolar stepper motor, which operates at 5V DC, and the ULN2003 driver board, which allows easy interfacing with microcontrollers like Arduino, ESP32, STM32, and Raspberry Pi.

The 28BYJ-48 is a compact 4-phase stepper motor featuring a gear reduction mechanism, which increases torque and step resolution. With a step angle of approximately 5.625° and a gearbox ratio of 1:64, it provides smooth and precise control ideal for small robotics, automation, and mechanical positioning projects.

The included ULN2003 driver board features seven Darlington transistor arrays, with four outputs used to drive the motor coils. LED indicators on the board show which coil is active, aiding in debugging. It accepts 5V input and is fully compatible with open-source libraries and example code, making it beginner-friendly.

Get your ULN2003 + 28BYJ-48 stepper motor kit now at eleberric.com, your trusted source in Sri Lanka for Arduino components and DIY electronics.

Specification

28BYJ-48 Stepper Motor

• Type: Unipolar stepper motor

• Operating Voltage: 5V DC

• Phases: 4

• Step Angle: 5.625°/64 (approx. 0.088°/step after gearbox)

• Reduction Ratio: 1:64

• Rated Torque: ~300 gf·cm

• Drive Mode: Wave drive / Full step / Half step

• Shaft Type: Circular with flat edge

• Dimensions: Approx. 28mm diameter body

• Cable Length: ~20cm with 5-pin connector

ULN2003 Driver Board

• Driver Chip: ULN2003A

• Inputs: IN1–IN4 (from microcontroller)

• Outputs: OUT1–OUT4 (to motor)

• Voltage Supply: 5V DC

• Indicators: 4 LEDs show step activation

• Connector: 5-pin JST for motor

• Mounting Holes: Yes

• Dimensions: Approx. 45mm × 32mm

Key Features

• Complete stepper motor control kit: driver + motor

• Easy to connect with Arduino, ESP32, STM32, and Raspberry Pi

• Smooth and precise control with gear reduction

• LED indicators for easy status monitoring

• Simple wiring with JST and DuPont connectors

• Supports wave drive, full-step, and half-step modes

• Reliable operation for low-power automation and robotics

Applications

• Arduino-based robotic arms and cars

• DIY CNC or camera slider projects

• Automated curtain systems

• Home automation prototypes

• Mechanical timing and indexing systems

• Educational kits for stepper motor control and programming