Added demo for k8055 usb interface board

octopus_k8055.rb

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+require 'octopus'
+require 'rubyk8055'
+include USB
+
+@off_delay = 0.4
+
+@r = RubyK8055.new
+@r.connect
+
+@r.clear_all_digital
+
+o = Octopus.new "/dev/ttyUSB0", 9600, 14
+id_hash = {}
+
+while true
+  id = o.read
+  if channel = id_hash[id]
+    @r.set_digital channel.to_i, false
+    # Clears the channel after certain delay.
+    Thread.new { sleep @off_delay; @r.set_digital channel.to_i, false }
+  else
+    print "Please enter a channel for this RFID tag '#{id}': "
+    id_hash[id] = gets.chomp
+  end
+end
+