led-controller

README

LED Controller

This is a project to control NeoPixel lights with a PiZeroW and golang

Usage

A cli for running neopixels

Usage:
  led-controller [flags]
  led-controller [command]

Available Commands:
  demo        Run a demo.
  help        Help about any command
  homekit     Run the lights as a homekit accessory.
  off         Turn off the lights.
  on          Turn on the lights.
  version     Prints the current version of the tool.

Flags:
      --add_dir_header                   If true, adds the file directory to the header
      --alsologtostderr                  log to standard error as well as files
  -f, --fade-duration int                The duration of fade-ins and fade-outs in ms. [FADE_DURTION] (default 100)
  -h, --help                             help for led-controller
  -l, --led-count int                    The number of LEDs in the array. [LED_COUNT] (default 12)
      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
      --log_dir string                   If non-empty, write log files in this directory
      --log_file string                  If non-empty, use this log file
      --log_file_max_size uint           Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
      --logtostderr                      log to standard error instead of files (default true)
      --max-brightness int               The maximum brightness that will work within the 0-250 range. [MAX_BRIGHTNESS] (default 200)
      --min-brightness int               The minimum brightness that will work within the 0-250 range. [MIN_BRIGHTNESS] (default 25)
      --skip_headers                     If true, avoid header prefixes in the log messages
      --skip_log_headers                 If true, avoid headers when opening log files
      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
  -v, --v Level                          number for the log level verbosity
      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging

Use "led-controller [command] --help" for more information about a command.

pi-builder

This is the cloud-init for building my pi image using Hypriot. I have encrypted the cloud-init.yaml file using sops and pgp since it contains secrets. There's not much to this file, so it should be easy to re-create on your own if you like.

Cross Compiling

This is cross-compiled for the Raspberry Pi using the instructions in the rpi-ws281x repository. This utilizes a build container that is based on the Balena Golang Image. If you are using a different Pi, you will want to change the base image in the Dockerfile

The build commands are in the Makefile. You can make build to build the Docker container and then use that to build the binary for the Pi. At the end it will show the output of file led-controller to verify the type of the binary.

The build will also create a local .tmp directory for storing build cache so that subsequent builds are much much faster.

Another word of caution: This container build will utilized your local GOPATH so that it doesn't have to download every package every time.

References

• golang library: https://github.com/rpi-ws281x/rpi-ws281x-go
• Pi Image Builder: https://github.com/hypriot/image-builder-rpi