A tool for interacting with rpi-rgb-led-matrix over ZeroMQ.
Depends on cppzmq and friends.
Requires a built rpi-rgb-led-matrix. Tell CMake where it is with -DRPI_RGB_LED_MATRIX_DIR.
Build with cmake, e.g.:
mkdir build cd build cmake -DRPI_RGB_LED_MATRIX_DIR=/path/to/rpi-rgb-led-matrix .. make
A Docker image is available for amd64 and arm64.
The server must be run with --privileged to allow GPIO access. This binary is only included in the arm64 image.
docker run \
--privileged \
--rm \
-v /run/lmz:/run/lmz \
ghcr.io/knifa/led-matrix-zmq-server:latest \
led-matrix-zmq-server \
--frame-endpoint ipc:///run/lmz/frame.sock \
--control-endpoint ipc:///run/lmz/control.sock \
--cols 64 \
--rows 64
# ...etc
led-matrix-zmq-control and led-matrix-zmq-pipe are also available in the image.
docker run \
--rm \
-v /var/run/lmz:/run/lmz \
ghcr.io/knifa/led-matrix-zmq-server:latest \
led-matrix-zmq-control \
--control-endpoint ipc:///run/lmz/control.sock \
set-brightness 128
See led-matrix-zmq-server --help for available options. These mostly passthrough to the rpi-rgb-led-matrix library.
sudo ./led-matrix-zmq-server \ --cols 64 \ --rows 64 \ --chain-length 2 # ...etc
The --xyz-endpoint options pass directly through to ZeroMQ, so you can use any valid transport string. For example, you could specify tcp://0.0.0.0:42069 to listen on the network.
The server is a simple ZMQ REQ-REP loop. All you need to do is send your frame as a big ol' byte chunk then wait for an empty message back. Each frame should be in a RGBA32 format.
led-matrix-zmq-pipe is both a bit of an example and a handy tool. It reads raw RGBA32 frames from stdin and sends them to the server.
# Use ffmpeg to convert a video to raw data. ffmpeg -re -i input.mp4 -vf scale=128:64 -f rawvideo -pix_fmt rgba - \ | sudo ./led-matrix-zmq-pipe -w 128 -h 64 # Use imagemagick to resize and convert an image to raw data. convert input.png -resize 128x64^ rgba:- \ | sudo ./led-matrix-zmq-pipe -w 128 -h 64 # Play a YouTube video. yt-dlp -f "bv*[height<=480]" "https://www.youtube.com/watch?v=FtutLA63Cp8" -o - \ | ffmpeg -re -i pipe: -vf scale=128:64 -f rawvideo -pix_fmt rgba - \ | sudo ./led-matrix-zmq-pipe -w 128 -h 64
Brightness and color temperature, etc. can be get/set through another simple REQ-REP loop.
Transitions are animated if a duration is provided.
See led-matrix-zmq-control --help for available options, or see the source to dig deeper.
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