A4988 Stepper Motor Drive Module With Heat sink:

The A4988 is a complete micro stepping motor driver with built-in translator for easy operation.
It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A.
The A4988 includes a fixed off-time current regulator which has the ability to operate in Slow or Mixed decay modes.
The translator is the key to the easy implementation of the A4988.
Simply inputting one pulse on the STEP input drives the motor one micr-ostep.
There are no phase sequence tables, high frequency control lines, or complex interfaces to program.
The A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.
During stepping operation, the chopping control in the A4988 automatically selects the current decay mode, Slow or Mixed.
In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time.
Mixed decay current control results in reduced audible motor noise, increased step accuracy, and reduced power dissipation.

Features:
Simple step and direction control interface
Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step
Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates
Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay)
Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection
Short-to-ground and shorted-load protection

Specifications:
Min & Max operating Voltages: 8V / 35V
Continuous current per phase: 1A
Max current per phase: 2A
Logic Voltage: 3-5.5V
Micro-step resolutions: Full, 1/2, 1/4, 1/8, and 1/16
Reverse voltage protection: No

Download Datasheet here.