Go Logitech Litra Glow Driver
This GO module implements a basic way to interact with a Logitech Litra Glow light. It uses karalabe/usb for the low level USB communications. I have only tested this on Linux.
The reverse engineered USB protocol comes from the kharyam/litra-driver Python implementation.
UDEV Config
Before you can use the light on Linux as a non-root user, you need to set up
the following UDEV rule in /etc/udev/rules.d/82-litra-glow.rules:
SUBSYSTEM=="usb", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="c900", MODE:="0666", GROUP="plugdev"
Then restart UDEV to refresh it rules:
udevadm control --reload-rules && udevadm trigger
And then (re-)plugin your light again.
Usage
Obtain the driver with:
go get derickr/go-litra-driver
Import the driver in your .go file:
import derickr/go-litra-driver
In order to use the driver to control the light, create a new instance of the
LitraDevice struct:
ld, err := litra.New()
Currently, the driver only supports one light. If the driver can't open the USD device, an error will be returned.
You can then use the ld variable as a handle to issue control statements.
| Task | Method | Arguments |
| Turn Light On | ld.TurnOn() | |
| Turn Light Off | ld.TurnOff() | |
| Set Brightness | ld.SetBrightness(level int) | level is brightness from 0 to 100 |
| Set Temperature | ld.SetTemperature(temp int16) | temp is light temperature
from 2700K to 6500K |
| Close Connection | ld.Close() |
If you supply an out-of-range value to SetBrightness or SetTemperature
it clamps to the supported range.