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what is this hardware option called?
DRV8880? Palou? else?
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When holding camera in place, use a lower current than when moving.
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Hi,
I noticed that both steppers get very hot when idle. Vref on the A4988s was > 0.9 V, which I'm sure isn't necessary for this scanner. I reduced it to 0.5 V which is plenty, motors stay cool.
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The Marlin version RC7 - 31 Jul 2016
Machine Self build coreXY
Electronics board ramps 1.4 with arduino 2560
Machine components (direct drive e3d lite, with termistors (my stepper drivers are m542…
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This was discovered when we tried to use an RPM of less than zero...
In DRV8880.x RPM it's a short, but in BasicStepperDriver.x it's a float...
Changing casting on DRV8880.x from short to float …
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In order to enable, one has to pull `ENABLE` up, but library pulls down, so that `enable()` disables driver and vice versa.
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Investigate ways to control Aref (and motor current) dynamically. It is currently controlled via a pot on the DRV board. Possibilities include
- break pot and use DAC + voltage divider
- use 1-2 digit…
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Should limit RPM based on driver fSTEP and microstep.
- DRV8880: 1MHz (470ns pulse)
- DRV8834: 250KHz (min 1.9us pulse)
- DRV8825: 250KHz (1.9us)
- A4988: 500KHz (1us)