Carving machine 3D printer expansion board CNC Shield V3 for A4988
 
Introduction:
The extension board can be used for carving machine and 3D printer driver expansion board, there are 4 slots for stepping
motor driver,it can not into the motor drive 4 road.And every step motor only need two IO interfaces, that is to say, 6pc IO interfaces can be manage three stepper motors well, it's very convenient.
 
Note:
When inserting the A4988 module, must be careful not to insert opposite. Stepper motor wiring as follows:
2A, 2B is a group (red, green), 1A, 1B is a group (blue, yellow).If you want to change direction, can be change the position of one group , for example 2A, 2B mutually exchanged.