lifx-sunrise-simulator.rb

require "lifx" # http://rubydoc.info/github/lifx/lifx-gem/master/frames

def calculate_color(i) # 0 <= i <= 1
  h = [40 * 2 * i, 40].min         # will be 40 (yellow) at i=1/2 and stay there
  s = 1.0 - [(i - 0.5) * 2, 0].max # will be 1 until i=1/2 and then go down to 0
  b = i
  LIFX::Color.hsbk(h, s, b, LIFX::Color::KELVIN_MIN)
end

duration = 30 * 60 # seconds
step_duration = 15 # seconds

client = LIFX::Client.lan
client.discover!

colors = (0..1).step(step_duration.to_f / duration.to_f).map { |i| calculate_color(i) }

# ensure the bulbs are actually *on* but turn brightness down *first* to avoid a flash to previous color
# before the sunrise timer starts
client.lights.set_color(colors.first, duration: 0)
sleep 1
client.lights.turn_on

colors.each do |color|
  client.lights.set_color(color, duration: step_duration)
  sleep(step_duration)
end