leddy

Linux LED controller for the fnatic miniSTREAK.

(Works on Windows, too, though: https://xanclic.moe/leddy.exe)

Usage

See leddy --help for a description of the supported effects.

You may need to run leddy with root rights to change your keyboard’s lighting.

Examples

Some examples for effects:

• leddy color=rgb:ff4000: Colors the whole keyboard orange
• leddy reactive-ripple/keyup: Creates a ripple (in changing colors, following the rainbow pattern) whenever a key is released
• leddy wave/color=rainbow: Lets a rainbow roll over the keyboard
• leddy rain/direction=down/speed=20/color=rgb:40ff00: Lets bright green rain drops flow slowly over your keyboard
• leddy gradient/color=gradient:ff0000@0,00ff00@70,0000ff@100: Creates kind of a rainbow gradient from left to right, where green is right of center
• leddy fade/color=gradient:ff8080,3080ff,ff8080: Fades between pink and blue (note that the positions are distributed evenly when omitted; also note that the color for positions 0 and 100 is the same)
• leddy --profile=2: Switch to profile 2 (note that without the --profile switch (or -p for short), leddy will always switch to and modify profile 1).
• leddy screen-capture: Lets ffmpeg take 18×6 pixel screenshots and displays them on the keyboard (in 60 FPS).

sound-spectrum

sound-spectrum is a software effect (that is, like screen-capture, leddy keeps running and manually updates all keys’ colors) that expects raw PCM data from stdin (44100 Hz s16 little-endian mono samples). For example, it can be used as follows:

parecord -r \
    -d $(LANG=C pactl info | grep Sink | sed -e 's/[^:]*..//').monitor \
    --raw --rate=44100 --channels=1 --format=s16le --latency-msec=50 \
    | leddy sound-spectrum

On Windows with ffmpeg, first get the device name:

ffmpeg -list_devices true -f dshow -i dummy

And then:

ffmpeg -f dshow -audio_buffer_size 10 -i audio="[input source]" \
    -f s16le -ac 1 -bufsize 1k - \
    | leddy sound-spectrum

Note that Powershell buffers pipe data until the first process has exited, so you will have to invoke the above in cmd.

udev rule

You may put your desired effect into a configuration file like /etc/leddy.conf, e.g.:

gradient/color=gradient:3080ff@0,3080ff@20,ff8080@20,ff8080@40,d0fff0@40,d0fff0@60,ff8080@60,ff8080@80,3080ff@80,3080ff@100

Then you can let xargs pass its content to leddy in a udev rule, like so:

ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="2f0e", ATTRS{idProduct}=="0102" RUN+="/bin/sh -c '/usr/bin/xargs /usr/bin/leddy < /etc/leddy.conf'"

Store this as a file in /etc/udev/rules.d, and your customization should be applied on system startup or whenever the keyboard is plugged in.

Considering that the keyboard does have memory to store every profile’s setting, this generally shouldn’t be necessary, though (apart from maybe switching the active profile). However, you may find it useful to add MODE="666" to be able to run leddy without root rights. I don’t know what the security implications of that are, though (i.e., whether this would allow any program to log keyboard input).