This Stepper Motor Driver Module is upgrade of A4988, simple step and direction control interface, 4-layer, 2 oz copper PCB for improved heat dissipation, six different step resolutions: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step and djustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor’s rated voltage to achieve higher step rates This Stepper Motor Driver Module is upgrade of A4988. Use to replace the A4988 to upgrade your 3D printer. Features - Simple step and direction control interface - Can interface directly with 3.3 V and 5 - Over-temperature thermal shutdown, over-current shutdown, and under-voltage - Short-to-ground and shorted-load protection - 4-layer, 2 oz copper PCB for improved heat dissipation - Exposed solder-able ground pad below the driver IC on the bottom of the PCB - Six different step resolutions: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, and 1/32-step - Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor�">39;s rated voltage to achieve higher step rates - Intelligent chopping control that automatically selects the correct current decay mode (fast decay decay - 45 V maximum supply voltage - Built-in regulator (no external logic voltage supply needed - Module size, , and interface match those of our A4988 stepper Package list: 15 * 4-layer Stepper Motor Driver Module for 3D Printer Reprap RP A4988