Hey guys!
I am pretty new to the Mycroft community and like what you are doing here! 
I decided to develop a skill that controls the LEDs of the Respeaker Mic Array v2.0, however I have run into a problem:
When I try to tell the device to change the LEDs, it gives me the following error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/pi/pixel_ring/pixel_ring/usb_pixel_ring_v2.py", line 25, in off
self.mono(0)
File "/home/pi/pixel_ring/pixel_ring/usb_pixel_ring_v2.py", line 16, in mono
self.write(1, [(color >> 16) & 0xFF, (color >> 8) & 0xFF, color & 0xFF, 0])
File "/home/pi/pixel_ring/pixel_ring/usb_pixel_ring_v2.py", line 66, in write
0, cmd, 0x1C, data, self.TIMEOUT)
File "/home/pi/mycroft-core/.venv/lib/python3.7/site-packages/usb/core.py", line 1071, in ctrl_transfer
self._ctx.managed_open()
File "/home/pi/mycroft-core/.venv/lib/python3.7/site-packages/usb/core.py", line 113, in wrapper
return f(self, *args, **kwargs)
File "/home/pi/mycroft-core/.venv/lib/python3.7/site-packages/usb/core.py", line 131, in managed_open
self.handle = self.backend.open_device(self.dev)
File "/home/pi/mycroft-core/.venv/lib/python3.7/site-packages/usb/backend/libusb1.py", line 804, in open_device
return _DeviceHandle(dev)
File "/home/pi/mycroft-core/.venv/lib/python3.7/site-packages/usb/backend/libusb1.py", line 652, in __init__
_check(_lib.libusb_open(self.devid, byref(self.handle)))
File "/home/pi/mycroft-core/.venv/lib/python3.7/site-packages/usb/backend/libusb1.py", line 604, in _check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 13] Access denied (insufficient permissions)
Is it not allowed for skills to access USB devices or am I doing something wrong?
Help is much appreciated! 