Description: This is a simple ULN2003 IC based stepper motor module. It can drive 4 phase stepper motor and also indicate active phase through LEDs. It requires 5 to 12 volts to power the motor. Attach a 5 wire stepper motor one side and microcontroller digital pins on other side (IN1-IN4) and you are ready to control stepper motor. This module requires 5v/0v logic level to turn on/off corresponding output pin. Additionally it has a jumper which can be removed to switch off the module. Just connect a relay in place of jumper to control module switching through microcontroller. On Pinguino 18F2550 it took us around 5 minutes to build interface with stepper motor.

Note: In case of 3.3v microcontrollers please use external level converters. Jumper color and header pins may vary slightly from the pictures above.

Documents:

• ULN2003 Datasheet
• Pinguino Stepper Motor Control Code
• Eagle Files