This was a quick one-off stepper tester board. This version uses a TMC2208 from Trinamic.
The idea for this version was to test out if the TMC2208 is really a drop in replacement for it's competetors in practice (spoiler: it is!). A few (very) minor improvements have been made to the code, but it actually ran with only new pin mappings and no other changes the first time I uploaded it.
For pcb design files look in PCB (KiCAD). For the arduino code look in the stepper_driver directory.
You can upload code to the board using your ISP programmer of choice (I use tinyISP) with the fuse settings and pin mappings for a pro-mini.
- Move the joystick up and down to change the pulse frequency within a single micro-stepping band (zero centered).
- Flick the joystick side to side to change the microstepping level. (faster to the left)
- To read the current microstepping level, count the status LED's pulses.
- To disable output, connect the jumper by the joystick.
The sketch uses a few Arduino libraries (below) all of which can be installed from within the Arduino IDE using the standard library tool.
- PWM Freak - convenience functions for setting pwm devisor values.
- TIMER1 - convenience functions for timer interrupts