[PD] stepper message syntax (pd through arduino)

[Christian Klippel]

hi again,

on a quick note, the sequence for using unipolar 4 coils steppers is:

A B C D	coils A - D
1 0 0 0	step1
0 1 0 0	step2
0 0 1 0	step3
0 0 0 1	step4

this is the full step sequence. you can do half-steps as well, practically 
doubling the number of steps per revolution:

A B C D	coils A - D
1 0 0 0	step1a
1 1 0 0	step1b
0 1 0 0	step2a
0 1 1 0	step2b
0 0 1 0	step3a
0 0 1 1	step3b
0 0 0 1	step4a
1 0 0 1	step4b


to make it turn continously, repeat the sequence. to change direction, step 
from 4 to 1 ....

if you want to use bipolar stepper motors, you need an extra h-bridge driver, 
so that the polarity of the coil driving voltage can be changed.

greets,

chris