RGB LED

An RGB LED controller for AT microcontrollers with bonus RSpec formatter.

Upload the src/rgb_led.ino to the microcontroller and use the following setup:

The executable is a simple pry based REPL.
Note that all usage here is applicable with the "Library" section below as well.

$ rgb_led
RGB LED > red
RGB LED > green
RGB LED > blue
RGB LED > update(1, 0.1, 0)
RGB LED > off
RGB LED > exit

Since it's just using a Ruby pry REPL, we can program the LED to do whatever we want.
Here, we're pulsing the LED red using a sine wave:

$ rgb_led
RGB LED > x = 0.0
RGB LED > loop do
RGB LED >   value = (Math.sin(x) + 1.0) / 2.0 # sin is a range from -1.0 to 1.0, so we modify it to a 0.0...1.0 range
RGB LED >   update(value, 0, 0)
RGB LED >   x += 0.01
RGB LED > end

The color gem can output red, green, and blue values in the 0.0 to 1.0 range, so we're able to use it to parse HTML/CSS color strings to set our LED color:

$ rgb_led
RGB LED > require 'color'
RGB LED > color = Color::RGB.from_html('#47021E')
RGB LED > update(color.r, color.g, color.b)

require 'rgb_led'

RGBLED::Controller.open('/dev/usbdevicepath') do |controller|
  controller.red
  sleep 1
  controller.green
  sleep 1
  controller.blue
  sleep 1
  controller.update(1, 0.1, 0) # Yellow. Really depends on how bright each diode is within the LED
  sleep 1
  controller.off
end

require 'rgb_led'

controller = RGBLED::Controller.open('/dev/usbdevicepath')
# ...
controller.close

Note: You can use multiple formatters with RSpec by passing multiple --format options.

spec_helper.rb

RSpec.configure do |config|
  # ...
  config.rgb_led_path = '/dev/usbdevicepath'
  # ...
end

.rspec

--require 'rgb_led/rspec_formatter'
--format RGBLED::RSpecFormatter

Copyright © 2016 Ryan Scott Lewis ryanscottlewis@gmail.com.

The MIT License (MIT) - See License.md for further details.