ULN2803A Relay And Stepper Motor Driver [Breakout Board]

Description
This CJMCU relay and stepper motor driver module is a breakout board for ULN2803A, which is a high-voltage, high-current Darlington transistor array. The device includes eight NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500mA. The Darlington pairs can be connected in parallel manner for higher current capability.
If you want to control a DC motor using Arduino, you must use some kinds of drivers such as ULN2803. Controlling a DC motor using ULN2803 is very easy, but it has a problem, you can't change the direction of rotation of motor by this circuit.

Features:
IC: ULN2803A
Maximum Output Voltage: 50V
Rated Collector Current: 500mA
Pin Number: 18 Pin
Size: 24mm x 23.33mm x 4.18mm
Compatible With ULN2800A Series

Applications:
Relay Drivers
Hummer Drivers
Lamp Drivers
Display Drivers (LED and Gas Discharge)
Line Drivers
Logic Buffers
Stepper Motors
HVAC Valve and LED Dot Matrix

Package Include:
1 x CJMCU ULN2803A Breakout Board