✍ The ULN2003 stepper motor driver board allows you to easily control the 28BYJ-48 stepper motor from a microcontroller, like the Arduino Uno. One side of the board side has a 5 wire socket where the cable from the stepper motor hooks up and 4 LEDs to indicate which coil is currently powered. The motor cable only goes in one way, which always helps.

✍ On the side you have a motor on / off jumper (keep it on to enable power to the stepper). The two pins below the 4 resistors, is where you provide power to the stepper. Note that powering the stepper from the 5V rail of the Arduino is not recommended. A separate 5-12V 1Amp power supply or battery pack should be used, as the motor may drain more current than the microcontroller can handle and could potentially damage it. In the middle of the board we have the ULN2003 chip. At the bottom are the 4 control inputs that should be connected to four Arduino digital pins.

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▼ Features
On-board ULN2003A chipset
5-12V power supply
On-board 4-way indicator light;
On-board XH-5P socket
Compatible with Arduino
Stepper Motor Driver Test and DIY

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▼ Specifications
Rated voltage: 5V to 12V DC
Number of Phase: 4
Speed Variation Ratio: 1/64
Stride Angle: 5.625° /64
Frequency: 100Hz
DC resistance: 50Ω±7%(25℃)
Idle In-traction Frequency: > 600Hz
Idle Out-traction Frequency: > 1000Hz
In-traction Torque: >34.3mN.m(120Hz)
Self-positioning Torque: >34.3mN.m
Friction torque: 600-1200 gf.cm
Pull in torque: 300 gf.cm
Insulation grade A