28BYJ-48 Stepper Motor 12V DC With ULN2003 Driver Module

Quick Introduction: Step up your automation game with the 12V 28BYJ-48 Stepper Motor Kit. While most hobby motors run on 5V, this specific model is wound for 12V DC operation, making it ideal for integration into automotive systems, 12V LED setups, or projects where a higher voltage bus is already available. The included ULN2003 Driver Board makes interfacing with microcontrollers like Arduino or ESP32 incredibly simple, with built-in status LEDs to visualise the stepping sequence.

Detailed Specifications

• Motor Model: 28BYJ-48 (12V Version).

• Rated Voltage: 12V DC.

• Motor Type: Unipolar Stepper (5-Wire).

• Step Angle: 5.625° / 64 (Internal).

• Gear Reduction Ratio: ~1/64.

• Effective Step Angle: ~0.088° (High Precision).

• Driver Chip: ULN2003 Darlington Transistor Array.

• Driver Logic Voltage: 5V (Compatible with Arduino/RPi signals).

• Motor Supply Voltage: 5V - 12V (Optimised for 12V).

• Phase: 4-Phase.

• Torque: High pull-in torque due to gearing (>34.3mN.m).

Quality Advantage & Differentiation: Why choose the 12V version?

1. System Compatibility: If your project (e.g., automated curtains, car vents) already runs on a 12V battery or adapter, you don't need a separate buck converter to drop voltage for the motor.

2. Lower Current: For the same power, a 12V motor typically draws less current than a 5V equivalent, putting less strain on wiring over longer distances.

3. Visual Feedback: The ULN2003 board features 4 LEDs (A, B, C, D) that light up as coils activate, making debugging code and wiring issues instant and intuitive.

Key Applications & Usage

• Smart Home: Motorised blinds or curtains (running on a 12V adapter).

• HVAC Control: Replacement motor for air conditioner swing vents.

• Robotics: Pan/Tilt camera mounts or small robotic arms.

• Automotive: Custom dashboard gauges or vent actuation.

• Dispensing: Precision liquid pumps or pill dispensers.

What's Included & Required

• Included: 1x 28BYJ-48 Stepper Motor (12V), 1x ULN2003 Driver Board.

• Required: 12V DC Power Supply (for motor), Microcontroller (Arduino/ESP32), Jumper Wires.

The "Virtual Technician" Support Panel

• ⚠️ 5V vs 12V WARNING:

  • Check the Label: Ensure your motor says "12V" on the back sticker.

  • Do NOT run this 12V motor off your Arduino's 5V pin. It will move very slowly or not at all due to insufficient voltage.

  • Do NOT run a standard 5V 28BYJ-48 on 12V. It will overheat and burn out the coils rapidly.

• ⚠️ POWER WIRING:

  • The Driver Board has pins for + (5-12V) and - (GND).

  • Connect your 12V Source to the "+" pin and GND to "-".

  • Crucial: Connect the Driver GND to your Arduino GND (Common Ground), but DO NOT connect the 12V wire to the Arduino.

• ⚠️ GEAR RATIO:

  • The gear ratio is often cited as 1:64, but technically it is slightly non-integer (approx 63.684). For precise 360-degree rotation over many turns, code compensation may be needed.