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March 8, 2026 23:17
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powermate
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| """ | |
| Griffin PowerMate Python 3 library for Windows | |
| Ported from crash7/griffin-powermate (Python 2) | |
| Requires: pip install pywinusb | |
| """ | |
| from pywinusb.hid import HidDevice, HidDeviceFilter | |
| def find_griffin_powermate(): | |
| return GriffinPowermate.find_all() | |
| class GriffinPowermate(): | |
| VENDOR = 0x077d | |
| PRODUCT = 0x0410 | |
| MOVE_LEFT = -1 | |
| MOVE_RIGHT = 1 | |
| def __init__(self, raw_device): | |
| self.__device = raw_device | |
| self.__device.set_raw_data_handler(lambda raw_data: self.__internal_listener(raw_data)) | |
| self.__events = {} | |
| @classmethod | |
| def find_all(cls): | |
| return [cls(device) for device in HidDeviceFilter(vendor_id=cls.VENDOR, product_id=cls.PRODUCT).get_devices()] | |
| def __internal_listener(self, raw_data): | |
| """ | |
| [0, button_status, move, 0, bright, pulse_status, pulse_value] | |
| move byte: 1-127 = clockwise (higher = faster), 129-255 = counter-clockwise (lower = faster) | |
| """ | |
| raw_move = raw_data[2] | |
| if raw_move == 0: | |
| delta = 0 | |
| elif raw_move < 128: | |
| delta = raw_move # positive = clockwise | |
| else: | |
| delta = raw_move - 256 # negative = counter-clockwise | |
| if 'move' in self.__events: | |
| self.__events['move'](delta, raw_data[1]) | |
| if 'raw' in self.__events: | |
| self.__events['raw'](raw_data) | |
| def is_plugged(self): | |
| return self.__device.is_plugged() | |
| def open(self): | |
| if not self.__device.is_opened(): | |
| self.__device.open() | |
| def close(self): | |
| if self.__device.is_opened(): | |
| self.__device.close() | |
| def on_event(self, event, callback): | |
| self.__events[event] = callback | |
| def set_brightness(self, bright): | |
| self.__device.send_feature_report([0, 0x41, 0x01, 0x01, 0x00, bright % 255, 0x00, 0x00, 0x00]) | |
| def set_led_pulsing_status(self, on=True): | |
| self.__device.send_feature_report([0, 0x41, 0x01, 0x03, 0x00, 0x01 if on else 0x00, 0x00, 0x00, 0x00]) | |
| def set_led_pulsing_default(self): | |
| self.__device.send_feature_report([0, 0x41, 0x01, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00]) | |
| if __name__ == '__main__': | |
| from time import sleep | |
| from msvcrt import kbhit | |
| position = 0 | |
| def move_listener(delta, button): | |
| global position | |
| position += delta | |
| # LED on while button held | |
| if button: | |
| powermate.set_brightness(254) | |
| else: | |
| powermate.set_brightness(0) | |
| direction = 'CW' if delta > 0 else 'CCW' if delta < 0 else '--' | |
| print("Pos: {:<6d} Delta: {:<+4d} Speed: {:<3d} Dir: {} Button: {}".format( | |
| position, delta, abs(delta), direction, button)) | |
| def raw_listener(data): | |
| # handle button press/release even without rotation | |
| if data[2] == 0: | |
| if data[1]: | |
| powermate.set_brightness(254) | |
| else: | |
| powermate.set_brightness(0) | |
| devices = GriffinPowermate.find_all() | |
| if len(devices) > 0: | |
| print("Found Powermates") | |
| powermate = devices[0] | |
| try: | |
| powermate.open() | |
| powermate.set_led_pulsing_status(False) | |
| powermate.set_brightness(0) | |
| powermate.on_event('move', move_listener) | |
| powermate.on_event('raw', raw_listener) | |
| print("\nPos Delta Speed Dir Button") | |
| print("----- ------ ----- --- ------") | |
| print("Waiting for data... Press any keyboard key to stop.\n") | |
| while not kbhit() and powermate.is_plugged(): | |
| sleep(0.5) | |
| finally: | |
| powermate.set_brightness(0) | |
| powermate.close() | |
| else: | |
| print("No PowerMate found. Is it plugged in?") |
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