Quote:
Originally Posted by Rac
The main downside is the mega2560 falls far short of a Teensy 3.2-3.6 for speed. I also noticed smoothness under tracking was much improved when I moved to a Teensy. All my mounts now use a Teensy 3.6.
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Hmmmm
I don't think the speed is an issue here - in my case ( I am using A4988 drivers, 16 /usteps), processor has to output a pulse every 15ms for tracking, which is not a large task, and it is timer interrupt driven. Slewing is much, much faster, and I never noticed any problems.
However, at the beginning when I experimented with other systems (SoundStepper) I did have a smoothness problem with A4988 drivers. I had to short the resistor, to obtain smooth motor operation (no missed pulses), see
here.
Most likely DRV8825 doesn't have that issue.
I like Teensy because it is smaller, so it may fit into smaller enclosure... but I don't like the price - So I am sticking with MEGA/RAMPS-1.4 for now, especially because i am using it for my CNC projects as well (3D printer, CNC mill, CNC lathe, laser engraver etc.).