lib/whipped-cream/sensor.rb in whipped-cream-0.1.0 vs lib/whipped-cream/sensor.rb in whipped-cream-0.1.1

@@ -6,9 +6,16 @@
   # state changes.
   class Sensor < Control
     attr_reader :name, :pin, :low, :high, :on_low, :on_high, :block
 
     def initialize(name, options = {}, &block)
+      # Pushing nil onto VALID_GPIO_PINS to allow a pinless sensor
+      raise "Invalid pin.  The pin must be one of "\
+            "the Raspberry Pi's valid GPIO pins: "\
+            "#{VALID_GPIO_PINS}" unless VALID_GPIO_PINS.dup
+                                                       .push(nil)
+                                                       .include?(options[:pin])
+
       @name = name
       @pin = options[:pin]
       @low = options[:low]
       @high = options[:high]
       @on_low = options[:on_low]