Led blink example with pi_piper on Raspberry Pi

pi-blink.rb

require 'rubygems'
require 'pi_piper'

# include PiPiper

# blink example
def pin
  @pin ||= PiPiper::Pin.new(pin: 17, direction: :out)
end

def counter
  @counter ||= 0
end

# unfortunately blink does not work properly, so use toggle method
def blink
  pin.on? ? pin.off : pin.on
end

def toggle
  if counter % 2 == 0
    pin.on
  else
    pin.off
  end
  # update counter
  @counter += 1
end

while true
  # blink
  toggle
  sleep 0.5
end