?The A4988 is a complete microstep motor driver with built-in converter for easy operation. The product can operate bipolar stepper motors in full, half, quarter, 1/8, and 1/16 step modes, with output drive performance up to 35 V and ±1 A. Internal circuit protection includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO), and cross-current protection. No special power sequencing is required.
?The A4988 includes a fixed off-time current regulator that can operate in slow or mixed-attenuation mode. The converter is the key to the A4988's ease of implementation. As long as you enter a pulse in the "Step" input, you can drive the motor to produce microsteps. There is no need for phase sequence tables, high-frequency control lines, or complex interface programming.
?In microstep operation, the chopping control in the A4988 automatically selects the current decay mode (slow or mixed). Hybrid attenuation current control schemes can reduce audible motor noise, increase step accuracy, and reduce power consumption. An internal synchronous rectification control circuit is provided to improve power consumption during pulse width modulation (PWM) operation.
?This is a set of disassembled part, and you need basic soldering skills to solder them together. Use removable A4988 compatible stepping driver.The extension board can be used for engraving machine or 3D printer driver.Compact design, stepping motor can connect 4 pin connectors or be soldered.Jumpers to set the Micro-Stepping for the stepper drivers.
?Compatible with GRBL 0.8. Open-source firmware operated on UNO, converting G code command into stepping signal.PWM spindle and direction pin, 4 shaft support (X, Y, Z, A - you can copy X, Y, Z or use pin D12 and D13 customize firmware perform complete shaft 4).The A4988 is available in a surface-mount QFN package (ES) with dimensions of 5 mm × 5 mm, a nominal overall package height of 0.90 mm, and an exposed heat sink to enhance heat dissipation.