jfols / ledfs

(Migrated from my old account @rucuriousyet) Drive Neopixels from JSON files on a Raspberry Pi

LedFS

A daemon for driving WS281x LEDs (Neopixels) using a FUSE filesystem on the Raspberry Pi

Usage

Follow the build instructions below to install the LedFS Daemon on the Raspberry Pi of your choice.

Config

Config is provided within <mountpoint>/options.json and automatically resets the program when changed. When reset, all leds are zeroed out, and the connection to the Neopixels is toggled off and on again.

Defaults to:

{
    "numLeds": 24,
    "gpioPin": 18,
    "brightness": 220
}

Colors

Colors are set using <mountpoint>/colors.json and automatically updated with the file is modified. Colors should be formated as an JSON array of hex color code strings like so:

{ "values": ["#FAFAFA", "#000000", "#1a0000"] }

Note that array values map directly to the Neopixels. If you have 24 leds, but only provide an array of three colors, only the first three leds will be colored.

Build setup

In order to compile the ledfs binary, you will need to setup a few things on Raspberry Pi. Once installed, using LedFS is as simple as running the executable like so: ledfsd /directory/to/mount. Please note that you may need to run the executable as root (since it needs access to the GPIO). While running, LedFS enables control over Neopixels using the configuration as found in <mountpoint>/options.json and the array of hex colors found in <mountpoint>/colors.json.

• Go: This should do the trick...

   sudo apt install golang
   mkdir -p $HOME/go
   echo "export GOPATH=$HOME/go" > .profile
   . .profile

• WS281x C and Go libs:

  Copy the libraries locationed in the deps directory to the path they are in minus the containing folder. For example files in, deps/usr/local/lib should be placed in /usr/local/lib.

• Root Priviledges: We'll leave that up to you and the internet.

• Fuse Libraries:

  This will install libfuse2 and the binaries required for mounting.

  sudo apt install fuse

As long as you have all of the above, compiling your go source like any other Go code should work fine. Just make sure to compile and then run the resulting binary as root, because the leds require root access to run, and funky errors appear if you aren't root.