What this product does The A4988 stepper motor driver module provides precise, adjustable control of bipolar stepper motors. It automatically manages current decay mode, lets you set a maximum current with a built-in potentiometer, and accepts simple step and direction signals for straightforward integration. Key benefits and why you need it Accurate microstepping for smoother motion: Five selectable step resolutions (full, half, quarter, eighth, sixteenth) reduce vibration and improve positional accuracy. Protects motors and electronics: The adjustable current control lets you limit motor current to match motor ratings, reducing overheating and extending component life. Reliable under changing loads: Intelligent chopping control automatically switches between fast and slow decay to maintain stable current and torque across operating conditions. Easy to integrate: Simple step and direction interface makes it quick to connect to motion controllers or microcontroller-based systems. Important specifications and performance Model: A4988 stepper motor driver module Step resolutions: full step, half-step, quarter step, eighth step, sixteenth step Output capacity: up to 35 V Current rating: up to ±1.2 A (with adjustable limit via onboard potentiometer) Chopping control: automatic selection of fast or slow decay for current regulation Practical features and usage notes Onboard potentiometer for fine adjustment of maximum current output Simple step and direction control signals for straightforward interface with controllers Compact PCB module suitable for integration into custom electronics Take anti-static precautions before handling and installation to avoid damage; observe proper wiring to prevent shorts Typical applications 3D printers and CNC routers: Smooth microstepping and current limiting help produce accurate, repeatable motion while protecting motors from excessive current. Small robotics and automation: Compact driver with selectable microstepping improves low-speed torque and reduces vibration for robot joints and precision actuators. Camera sliders and motion control rigs: Fine microstepping delivers smooth, quiet motion for video and timelapse systems. Quick integration checklist Verify motor voltage is within the driver’s 35 V limit Adjust the onboard potentiometer to set motor current at or below the motor’s rated value (monitor motor temperature) Connect step and direction signals from your motion controller or microcontroller Follow standard anti-static and wiring precautions to prevent damage This A4988 module provides a compact, controllable, and reliable solution for driving bipolar stepper motors where adjustable current, selectable microstepping, and automatic current decay control are required.