added isHigh?(pin) and isLow?(pin). URGENT TODO: switch to Firmata protocol.

Signed-off-by: Akash Manohar J <[email protected]>

Author: HashNuke

arduino.gemspec

@@ -3,7 +3,7 @@ $:.push File.expand_path("../lib", __FILE__)
 
 Gem::Specification.new do |s|
   s.name        = "arduino"
-  s.version     = "0.3.2"
+  s.version     = "0.3.3"
   s.date 				= %q{2011-01-01}
   s.platform    = Gem::Platform::RUBY
   s.authors     = ["Akash Manohar"]

example_blink.rb

@@ -1,15 +1,17 @@
 require "./lib/arduino"
 
 #specify the port as an argument
-myBoard = Arduino.new('/dev/ttyUSB0')
+board = Arduino.new('/dev/ttyUSB0')
 
 #declare output pins
-myBoard.output(13)
+board.output(13)
 
 #perform operations
 10.times do
-  myBoard.setHigh(13)
+  board.setHigh(13)
+  puts "High" if board.getState(13)
   sleep(1)
-  myBoard.setLow(13)
+  board.setLow(13)
+  puts "Low" if !board.getState(13)
   sleep(1)
 end

lib/arduino.rb

@@ -18,6 +18,7 @@ def initialize(port, baudrate=115200)
 	  @serial.sync
 	  @port = port
 	  @outputPins = []
+	  @pinStates = {}
 	end
 
 	# Print information about connected board
@@ -37,27 +38,51 @@ def output(*pinList)
 	  else
 		 	raise ArgumentError, "Arguments must be a list of pin numbers"
 	  end
-	end
-
-	# Get state of a digital pin. Returns true if high and false if low.
-	def getState(pin)
-	  sendData('2')
-	  sendPin(pin)
-	  return formatPinState(getData())
+	  return pinList
 	end
 
 	# Set a pin state to low
 	def setLow(pin)
+		saveState(pin, false)
 	  sendData('0')
 	  sendPin(pin)
 	end
 
+	def isLow?(pin)
+		if !getState(pin)
+			return true
+		else
+			return false
+		end
+	end
+	
 	# Set a pin state to high
 	def setHigh(pin)
+		saveState(pin, true)
 	  sendData('1')
 	  sendPin(pin)
 	end
 
+	def isHigh?(pin)
+		if getState(pin)
+			return true
+		else
+			return false
+		end
+	end
+	
+	def saveState(pin, state)
+		@pinStates[pin.to_s] = state
+	end
+
+		# Get state of a digital pin. Returns true if high and false if low.
+	def getState(pin)
+		if @pinStates.key?(pin.to_s)
+			return @pinStates[pin.to_s]
+		end
+	  return false
+	end
+	
 	# Write to an analog pin
 	def analogWrite(pin, value)
 		sendData('3')
@@ -109,10 +134,4 @@ def getData
 	  cleanData = @serial.readlines()
 	  cleanData = cleanData.join("").gsub("\n","").gsub("\r","")
 	end
-
-	def formatPinState(pinValue)
-	  return true if pinValue=="1"
-	  return false #if pinValue=="0"
-	end
-
 end