Rakefile

require 'usb'
require 'betabrite'

###
# Get a betabrite sign:
#
#   http://www.betabrite.com/
#   http://www.amazon.com/Brite-Prism-Moving-Message-Display/dp/B000MQAI72
#
# Install gems:
#
#   $ gem install usb betabrite
#
# Run once:
#
#   $ rake betabrite:reset betabrite:allocate betabrite:format
#
# Subsequent runs:
#
#   $ rake betabrite:update SLOT0=foo SLOT1=bar
#
namespace :betabrite do
  desc 'Reset sign memory'
  task :reset do
    BetaBrite::USB.new.reset!
  end

  desc 'Allocate memory slots'
  task :allocate do
    bb = BetaBrite::USB.new do |sign|
      sign.allocate do |memory|
        memory.text('A', 4096)
        memory.string('0', 64)
        memory.string('1', 140)
      end
    end
    bb.write_memory!
  end

  desc 'Format the main screen'
  task :format do
    bb = BetaBrite::USB.new do |sign|
      sign.stringfile('0') do
        print string("hello").red
      end

      sign.stringfile('1') do
        print string("world").green
      end

      sign.textfile do
        hold
        print stringfile("0")
        print string ' '
        print stringfile("1")
      end
    end
    bb.write!
  end

  task :update do
    BetaBrite::USB.new { |sign|
      sign.stringfile('0') do
        print string(ENV['SLOT0']).rgb('0000FF')
      end

      sign.stringfile('1') do
        print string(ENV['SLOT1']).rgb('FFFFFF')
      end
    }.write!
  end
end