{"title":"A4988 Stepper Motor Driver Carrier","handle":"a4988-stepper-motor-driver-carrier","url":"/products/a4988-stepper-motor-driver-carrier","description":"A breakout board for the Allegro A4988 DMOS microstepping stepper motor driver with translator and overcurrent protection. It lets you control one bipolar stepper motor at up to 2 A per coil (with sufficient cooling) using a simple step-and-direction interface.\n\nThe board ships with all surface-mount components installed. A 1×16-pin breakaway 0.1″ male header is included but not soldered, ready for use with breadboards or 0.1″ connectors.\n\nKey Features\n\n\nSimple Control Interface – Step and direction pins for easy microcontroller integration\n\nFive Microstep Resolutions – Full, half, quarter, eighth, and sixteenth step\n\nAdjustable Current Limiting – Onboard potentiometer sets the maximum output current, allowing voltages above the motor's rated voltage for higher step rates\n\nIntelligent Chopping Control – Automatically selects fast or slow current decay mode\n\nBuilt-In Protection – Over-temperature thermal shutdown, under-voltage lockout, crossover-current, short-to-ground, and shorted-load protection\n\nMotor Supply – 8–35 V\n\nLogic Supply – 3–5.5 V\n\nMax Current – 2 A per coil (with heat sink; ~1 A without)\n\n\n\nWarning: Low-ESR ceramic capacitors on this board make it susceptible to destructive LC voltage spikes with long power leads. Place a large (at least 47 µF) electrolytic capacitor across VMOT and GND close to the board.\n\n\n\nWarning: Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver.\n\n\nCurrent Limit Setting\nThe current limit can be set by measuring VREF on the board. The formula is:\nIMAX = VREF / (8 × RCS)\nwhere RCS is 0.068 Ω on boards manufactured from January 2017 (0.050 Ω on earlier boards). For example, for a 1 A current limit with 68 mΩ sense resistors, set VREF to 540 mV.\n\nMicrostep Resolution\n\n\nMS1 Low, MS2 Low, MS3 Low – Full step\n\nMS1 High, MS2 Low, MS3 Low – Half step\n\nMS1 Low, MS2 High, MS3 Low – Quarter step\n\nMS1 High, MS2 High, MS3 Low – Eighth step\n\nMS1 High, MS2 High, MS3 High – Sixteenth step\n\n\nAlso Available\n\n\nA4988 Black Edition – four-layer PCB with ~20% better thermal performance\n\n\nResources\n\nA4988 Datasheet (PDF)\nPololu A4988 FAQs\n\n\nPackage Contents\n\n1× A4988 Stepper Motor Driver Carrier\n1× 1×16-pin 0.1″ Male Header (not soldered)\n","vendor":"Pololu","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":11242,"title":"Default Title","sku":"PL-1182","price":9.76,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}