The PWM or Pulse width Modulation can be used on the Arduino is several ways. In this guide explain how PWM work and techniques, as well as how to use the PWM registers directly to the Arduino board and control
How to used ULN2003 Stepper Motor Driver Module in Arduino Tutorial Guide
The ULN2003 Stepper Motor Driver Module is small size & ease to use electronic module, it used ULN2003 Chip to amplify the signal from the micro controller, Input voltage max 15v Logic Control Voltage: 3 to 5.5v Motor Supply Voltage: 5 to