GPIO RGB LED

ピンを開く

{:ok, red} = Circuits.GPIO.open("GPIO17", :output)
{:ok, green} = Circuits.GPIO.open("GPIO18", :output)
{:ok, blue} = Circuits.GPIO.open("GPIO27", :output)

LED の点灯

# Red
Circuits.GPIO.write(red, 1)
Circuits.GPIO.write(green, 0)
Circuits.GPIO.write(blue, 0)

# Green
Circuits.GPIO.write(red, 0)
Circuits.GPIO.write(green, 1)
Circuits.GPIO.write(blue, 0)

# Blue
Circuits.GPIO.write(red, 0)
Circuits.GPIO.write(green, 0)
Circuits.GPIO.write(blue, 1)

# Yellow
Circuits.GPIO.write(red, 1)
Circuits.GPIO.write(green, 1)
Circuits.GPIO.write(blue, 0)

# Purple
Circuits.GPIO.write(red, 1)
Circuits.GPIO.write(green, 0)
Circuits.GPIO.write(blue, 1)

# White
Circuits.GPIO.write(red, 1)
Circuits.GPIO.write(green, 1)
Circuits.GPIO.write(blue, 1)

PWM

Circuits.GPIO.write(red, 0)
Circuits.GPIO.write(green, 0)
Circuits.GPIO.write(blue, 0)

defmodule PWM do
  def set(led, duty, length) do
    on_time = (10 * duty) |> round()
    off_time = 10 - on_time
    full_time = (length / 10) |> round()

    1..full_time
    |> Enum.map(fn _ ->
      Circuits.GPIO.write(led, 0)
      Process.sleep(off_time)
      Circuits.GPIO.write(led, 1)
      Process.sleep(on_time)
    end)
  end
end

PWM.set(red, 0.3, 1000)
PWM.set(red, 0.6, 1000)
PWM.set(red, 1.0, 1000)

Circuits.GPIO.write(red, 0)
Circuits.GPIO.write(green, 1)
Circuits.GPIO.write(blue, 0)

# Cyan
PWM.set(blue, 0.2, 5000)

ピンを閉じる

Circuits.GPIO.close(red)
Circuits.GPIO.close(green)
Circuits.GPIO.close(blue)