Hans-Christoph Steiner wrote:
On Oct 6, 2006, at 12:14 AM, Martin Peach wrote:
...
As far as steppers go it would be nice to have arduino commands for
steppers. It looks like the existing pduino firmware code can only
change one pin at a time, it would be nice to have a parallel digital
pin command with a mask like set_digital_outs(int output_pattern, int
mask) so the set bits in mask would be changed, at the same time,
according to output_pattern and the zero bits would be unaffected.
Couldn't the stepper commands be written as Pd objects or is the
serial port too slow? Do you know the maximum speed you can send the
stepper control pulses?
I just tried it yesterday with a bipolar (4-wire) stepper from an old 5
1/4" floppy drive and a dual h-bridge. It worked well if I sent the bit
patterns in sequence. The metro was running at around 15ms at the
smoothest rotation. Faster than about 10 it started missing steps. The
patch is just a counter that bangs a sequence of four numbers into arduino.
Also, are there standardized patterns for steppers?
Here are some:
http://www.appliedmotionproducts.com/support/wiring.php
I don't know how standard they are. It usually doesn't take long to
figure them out from scratch, you can't damage the motor.
The coils can be found with an ohmmeter, the sequence by trial and error.
Martin
.hc
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