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This product is a breakout board for Allegro's A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection; please read the A4988 datasheet carefully before using this product.
This stepper motor driver lets you to operate bipolar stepper motors in full-, half-, quarter-, eighth-,
and sixteenth-step modes, with an output drive capacity of up to 35 V and 2 A.
The translator is the key to the easy implementation of the A4988.
Simply inputting one pulse on the STEP input drives the motor one microstep.
There are no phase sequence tables, high frequency control lines, or complex interfaces to program.
The A4988 interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened.
Warning:
Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver.
(More generally, rewiring anything while it is powered is asking for trouble.)
Package Include:5PCS A4988 Stepper Motor Driver Module 3D Printer Polulu StepStick RAMPS RepRap
din
Reviewed in the United States on August 5, 2024
These are great and do exactly what they say they do. However, these are very delicate and easy to destroy.Here's a couple tips if you're not familiar with these boards.1. Do NOT plug these into a power source without first connecting them to the stepper motor, it will blow the unit easily.2. Be very very careful around the unit, these are super easy to short.3. Check your wiring, stepper motor wiring that come with the units don't always match the wiring in for this controller, most often you need to switch the A and A- wires for it to work properly.4. Adjust the current prior to using, failure to do so will blow the unit and maybe your stepper as well.The formular for these is simple, the Vref = IMax x 8 * 0.10 ... where IMax is the rating of your stepper motor. For example, if the stepper is rated at 1.6 Amps, then Vref = 1.6 * 8 * 0.10 which equals 1.28V. However, it's not a good idea to start with the max, so multiply that by 0.80 and you get 1.024V. So the beginning recommended formula is Vref = (IMas * 8 * 0.10) * 0.80 = 1.024.Adjust the voltage on the board using a multimeter and set the voltage to 1.024V as a starting point, and go from there, not to exceed 1.28V.
Robert
Reviewed in the United States on January 1, 2020
They work pretty decent, fixed my burnt out stepper driver situation.
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