Fab Stepper Driver

Fab-Labbable (i.e. easy-to-pcb-mill) design for a networked stepper driver.

SAMD21E18 micro, 2x A4950 H-Bridges to drive, UART over RS485 network / bus connection.

Status

2021 06 15

I have the D21 alive and running, and the 2x H-Bridges alive and stepping w/ microstepping via VREFs and a LUT. A previous design used TTL comms and the SPI peripheral, I have elected to re-do with UART over RS485. Those boards are in the mail, so I'll be testing / making-alive next month. I'm also interested in refining an embedded-level motion controller and networked interface. The D21 presents some (mostly RAM limited) programming challenges, and without an FPU I'm curious about how well lookahead will work.

dev log

Images

Slightly older version:

BOM