The A4988 Stepper Motor Driver Module is a microstepping driver designed to control bipolar stepper motors with high precision. It supports adjustable current limiting and multiple microstepping modes, making it ideal for CNC machines, 3D printers, robotics, and motion control applications where smooth and accurate motor movement is required.
Core Driver Specifications
• Driver IC: A4988
• Motor Type: Bipolar stepper motor
• Control Interface: STEP / DIR
• Microstepping Modes: Full, 1/2, 1/4, 1/8, 1/16
Electrical & Interface
• Logic Supply Voltage (VDD): 3.3 V – 5 V
• Motor Supply Voltage (VMOT): 8 V – 35 V
• Output Current: Up to 1 A per phase (2 A peak with cooling)
• Control Pins: STEP, DIR, ENABLE
• Configuration Pins: MS1, MS2, MS3
• Protection: Overcurrent, thermal shutdown, undervoltage lockout
Performance Characteristics
• Smooth motor motion using microstepping
• Adjustable current limit via onboard potentiometer
• Fast response suitable for high-speed motion control
• Reliable operation with proper cooling
Physical Characteristics
• Module Type: Plug-in stepper motor driver module
• Form Factor: Pololu-compatible footprint
• Heatsink Support: Optional external heatsink recommended
• Compact and lightweight design
Compatibility
• Arduino Uno / Mega
• CNC Shield
• ESP32 / ESP8266
• STM32 controllers
• 3D printer and CNC controller boards
Key Advantages
• Fine microstepping for smooth movement
• Simple STEP/DIR interface
• Wide motor voltage support
• Built-in protection features
Technical Insights
• Current limit must be set before connecting the motor
• Heatsink and airflow recommended at higher currents
• Microstepping selection via MS1–MS3 pins
• Motor should never be connected or disconnected while powered
Applications
• 3D printers
• CNC machines
• Robotic arms
• Camera sliders
• Precision motion control systems
Pro Tip
• Adjust current limit using a multimeter before operation
• Use proper cooling to avoid thermal shutdown
• Match motor current rating with driver settings
• Secure wiring to prevent intermittent motor faults
Package Includes
• 1 × A4988 Stepper Motor Driver Module