A4988 Stepper Driver Duplicator

Got the boards from Seeed yesterday, and soldered one up:

Assembly was easy. I was worried about soldering the SMD caps, but with the right tip it was simple enough.

Right now, this project is *done*, but I still need to test it. That's not going to happen until I have the Z motors in the Long D printer, and that won't happen until some weird flanged bearings show up in my mailbox.

I have 9 more of these boards. If you want one, drop me a line and I'll see what I can do. Otherwise, I'll just give them all away at next year's MRRF.

here are two parts to this project: a board that takes the step, direction, and enable pins from a socket meant for an A4988 stepper motor driver, and a second board that fans it out to four separate A4988 motor drivers.

Here's the cable adapter:

Simple enough, and uses very common 2x3 ribbon connectors.

The second board drives four A4988 motor controllers with all the requisite hardware. These boards are combined into a single PCB for ease of ordering.

It's designed to connect to stepper motors and a power supply through screw connectors.

And the relevant parts of the schematic: