LIFX Sunrise Simulator

lifx-sunrise-simulator.rb

require "lifx" # http://www.rubydoc.info/gems/lifx

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 = 10 * 60 # seconds

step_duration = 1 # seconds

client = LIFX::Client.lan
client.discover!(timeout: 60)

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

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

Information about the LIFX lightbulb: http://lifx.co/

Video on YouTube:

Another implementation: https://github.com/ryanseddon/sunrise-lifx

Nice! I have been nerding out on watching sunrise timelapse videos and seems a more natural sunrise starts blue/purpelish and then goes red/orange and finally a bright yellow.

would be cool to have a sunset that goes from current state of bulb to dark at a set time too :)