Can some one help me with DRV8825 stepper drivers.

3D Printing
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Can some one help me with DRV8825 stepper drivers. I put first time that driver my printer to handle two Z axle motors. A4988 not able to drive that without skipping steps. DRV8825 work very well very little current. Maybe my A4988 is faulty or china problems :slight_smile:

Now i have noisy problem with DRV that keep quite high frecuenzy noise when stepper motors are on, stepper not need to move that frecuenzy is always on when motors is on.

Only what i think to change jumpers on ramps and do stepping to 1/8 or 1/16. Now i think DRV8825 working 1/32 when all jumpers are attached to RAMPS board.

Maybe down that stepping get that noise of or what you think guys? Or can i do some setting on Smoothieware to get that high frecuenzy noise of. Not any problems with noise when i used A4988 drivers.

Many thanks all who can help me with this problem.

Edit: Same time i thinking my stepper motors are not that “strong” what they are old Mega2560 system. Is that possible example some faster frecuenzy that smoothie use because 32bit prosessor. Example all stepper motors are cold, before they are little bit warm always when printing.

Anyone have same thingings or do i just thinking wrong?

Edit2: Now using 100khz smoothie stepping frecuenzy. Find some thinking maybe that is too much to drivers and do that high frecuenzy noise. Now try to but that lover 30khz example.

Anyone have information how that need to edit with nema17 motors and 3d printers.
microseconds_per_step_pulse 1 #Duration of step pulses to stepper drivers, in microseconds

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8825s are noisy, sorry. The hissing/whining noise is caused by the fixed-frequency 30KHz PWM chopping algorithm having some audible subharmonics.

You can try changing the decay mode, which will change the character of the noise. Fast Decay will have the most accurate microstepping, but probably also the most audible noise. Mixed Decay introduces ripples into the print for a lot of PSU/motor combinations, but tends to be less noisy. Slow decay is awful, don’t bother.

You can check the decay mode performance using my stepper simulator if you have a basic datasheet for your motors:

Honestly though, if I were you, I would pick up some 5984s or 6128s from Panucatt. Both are great drivers, much better current control than 4988s or 8825s.

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Ok thx for info. Just google things are do same thinkings.

Are that 6128 128 microstepping more silent than 5984?

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Yes, finer microstepping is quieter, but the 1/32 stepping of the 5984 is already pretty quiet, and you have to worry about step pulse generation rates at some point. I like to run my 6128s at 1/32 with 0.9 degree steppers or 1/64 with 1.8 degree steppers. I like to do fast travel moves though.