This expansion board is a driver expansion board. It can be used for engraving machines, 3D printers etc.
It has a total of four slots. It can carry four A4988 stepper motor drivers in total. Each stepper motor only need two IO ports. In other words, six IO ports can managed three stepper motors. Very convenient to use.
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 want to change direction, can be change the position of one group , for example 2A, 2B mutually exchanged.