SainSmart A4988 Stepper Motor Driver for Arduino Mega2560 Mega1280 RepRap Ramps

This product is a carrier board or breakout board for Allegro"s A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection; we therefore recommend careful reading of the A4988 datasheet (380k pdf) before using this product. This stepper motor driver lets you control one bipolar stepper motor at up to 2 A output current per coil (see the Power Dissipation Considerations section below for more information). The equivalent to A4983-board but offers over current protection. If the boards get too hot, they will interrupt the current until it cools a bit. If the current is too high for the heat sinking, the motors will pulse as the current is interrupted and restored.