A4988 DRV8825 3D PRINTER STEPPER MOTOR DRIVER CONTROL EXTENSION SHIELD If jumper is hit the position of ON DP, that means 16 segment (4988) or 32 segment (8825)Jm connected motor
connect 5v and 9v power supply E, S, D, G, respectively corresponding to the connection of the Enable/Step/Dir/Gnd drive signal output