Go Logitech Litra Glow Driver

This GO module implements a basic way to interact with a Logitech Litra Glow light. It uses karalabe/usb <https://github.com/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 <https://github.com/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::

SUBSYSTEMS=="usb", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="c900", MODE:="0666", GROUP="plugdev"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="c900", TAG+="uaccess"
KERNEL=="hidraw*", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="c900", TAG+="uaccess"

Then restart UDEV to refresh it rules as root::

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.