OK. I’ve got a few drv8825 drivers sitting around. They are way too complicated, but I wonder if this would work.
Short the step, dir pins to ground.
Adjust the pot to be a small current, like 100mA.
Wire up the microsteps however you want.
Connect the EN pin to a microcontroller.
Connect some LEDs (without resistors) to coil A.
What would happen if the microcontroller turned on EN? Assuming their first step was +A and not -A, +B, -B (but whatever it is, we could switch it). Would it just send the set current through the LEDs, or are the drivers smarter than that? I wonder what the frequency of it switching on and off is, if it’s fast enough to not destroy the LEDs when on.
I just so happen to have a bunch of drv8825s and some LEDs I want to power. I had this idea, and I probably won’t even try it, but I am curious if it would work.