An example script to see how https://github.com/ofgulban/griffin-powermate works.

powermate_pywinusb_test.py

"""Test Griffin Powermate library using pywinusb."""

from griffin_powermate import GriffinPowermate


def rotation_listener(data):
    """Print powermate input only for rotation."""
    global dial_click
    if data[1] == 1 :
        dial_click = True
    elif data[2] > 127:
        print data[2] - 256
    else:
        print data[2]


devices = GriffinPowermate.find_all()

# use the first powermate available
powermate = devices[0]
powermate.open()
powermate.on_event('raw', rotation_listener)

# set the light (0 - 255)
powermate.set_brightness(0)

dial_click = False
while dial_click is False:
    x = 1

powermate.close()