This is a driver I've written in MicroPython for the ESP-WROOM-32 to interface with the TMC2208 v3.0 UART to control a NEMA motor.
To be specific, this is a really basic driver to help anyone move their NEMA motor with this setup. I found drivers written in C for the standard Arduino environment, but I didn't want to use C for my "just for fun" project.
I'm using Thonny as my IDE, and I'm runnning MicroPython 1.19.1, though I don't think I'm doing anything particularly version-specific. It's the newest version as of posting this. I flashed my ESP-DEVKITV1 board (aka ESP32 aka ESP-WROOM-32) with "esp32-20220618-v1.19.1", but there's a tutorial about how to do all that on the MicroPython website.
The correct wiring is as follows:
| ESP32 | TMC2208 | Motor | PSU |
|---|---|---|---|
| GND | GND | ||
| 3V3 | VIO | ||
| OB2 | ORNG | ||
| OB1 | BLUE | ||
| OA1 | BRWN | ||
| OA2 | BLCK | ||
| GND | GND | ||
| VM | 12-24VDC | ||
| Pin 5 | DIR | ||
| Pin 18 | STEP | ||
| TX2 | PDN | ||
| RX2 | PDN | ||
| Pin 19 | EN |
Upcoming changes:
Be able to change motor current easily
Have a more test functionality available in the "firmware"