How to using Stepper Motor while interfacing with Arduino and Stepper Motor Driver?

Bipolar Stepper Motor is DC motor that move in discrete steps. It has multiple coils that are organized in groups called "phases". By energizing each phase in sequence, the motor will rotate, a step at a time. In order to be able to move the motor, you will need a motor driver. Thus, stepper motor driver A4988 is designed to play this role. A4988 stepper motor driver comes with heat sink. This stepper motor driver lets you control one bipolar stepper motor at up to 2 A output current per coil.

Procedure (1)
This example is done by driving the 42 Step Stepper Motor device using the Arduino UNO via A4988 Stepper Motor Driver Module. Before connecting the motor power supply to the module, the sample source code must be uploaded first into the Arduino UNO board via USB 2.0 type A male to type B male cable.

Procedure (2)
Next, adjust the current limiting of the driver by using the potentiometer on board. This is to make sure that the current is within the current limits of the motor ranges from 0mA to 2000mA (2A).
In order to prevent damage to both of the motor and driver module, the current must actively be limited to under 1A. In full step mode, the current through the coils is limited to 70% of the current limit, so to get a full-step coil current of 1 A, the current limit should be 1 A/0.7=1.4 A, which corresponds to a Vref of 1.4 A/2.5=0.56 V.

Procedure (3)
The USB cable that is used to upload the source code can now be disconnected. Next, connect the motor power supply (Li-on Battery, 7.4 V, 1200mAh) to the module through the power jack. The stepper motor will start to rotate clockwise and anticlockwise according to the given sample source code.

Check here more “best stepper motor online”.