... . You can refer to the back of the Arduino code, direct drive motor The advantages compare to 4988 : 1, the maximum current of 2.5 ... A. 2, the highest support 32 subdivision. 3, 4 layer PCB, better heat dissipation performance. 4, chip resistance ... smaller, lower heat, heat better. Parameters: Size: 15 mmx20mm (the same as 4988) Drive current: 2.5 A ...