Updated digital pin and added pwm raspi example.

examples/raspi_led_brightness.coffee

@@ -0,0 +1,20 @@
+Cylon = require('..')
+
+# Initialize the robot
+Cylon.robot
+  connection:
+    name: 'raspi', adaptor: 'raspi', port: '/dev/ttyACM0'
+
+  device:
+    name: 'led', driver: 'led', pin: 11
+
+  work: (my) ->
+    # we do our thing here
+    brightness = 0
+    fade = 5
+    every 0.05.seconds(), ->
+      brightness += fade
+      my.led.brightness(brightness)
+      fade = -fade if (brightness is 0) or (brightness is 255)
+
+.start()

src/digital-pin.coffee

@@ -34,29 +34,29 @@ namespace 'Cylon.IO', ->
       @mode ?= mode
 
       # Check if the pin acceess file is already in the GPIO folder
-      FS.exists @_pinPath(), (exists) =>
+      FS.exists(@_pinPath(), (exists) =>
         if exists then @_openPin() else @_createGPIOPin()
+      )
 
     close: ->
-      FS.writeFile @_unexportPath(), "#{ @pinNum }", (err) =>
+      FS.writeFile(@_unexportPath(), "#{ @pinNum }", (err) =>
         @_closeCallback()
+      )
 
     closeSync: ->
-      FS.writeFileSync @_unexportPath(), "#{ @pinNum }"
+      FS.writeFileSync(@_unexportPath(), "#{ @pinNum }")
       @_closeCallback false
 
     digitalWrite: (value) ->
       @_setMode('w') unless @mode is 'w'
       @status = if value is 1 then 'high' else 'low'
 
-      FS.writeFile @_valuePath(), value, (err) =>
+      FS.writeFile(@_valuePath(), value, (err) =>
         if err
-          @emit(
-            'error',
-            "Error occurred while writing value #{value} to pin #{@pinNum}"
-          )
+          @emit('error', "Error occurred while writing value #{value} to pin #{@pinNum}")
         else
-          @emit 'digitalWrite', value
+          @emit('digitalWrite', value)
+      )
 
     # Reads the pin input every interval amount of time:
     # params:
@@ -65,14 +65,15 @@ namespace 'Cylon.IO', ->
       @_setMode('r') unless @mode is 'r'
       readData = null
 
-      setInterval =>
-        FS.readFile @_valuePath(), (err, data) =>
+      setInterval(() =>
+        FS.readFile(@_valuePath(), (err, data) =>
           if err
-            @emit 'error', "Error occurred while reading from pin #{ @pinNum }"
+            @emit('error', "Error occurred while reading from pin #{ @pinNum }")
           else
             readData = data
-            @emit 'digitalRead', data
-      , interval
+            @emit('digitalRead', data)
+        )
+      , interval)
 
     setHigh: ->
       @digitalWrite 1
@@ -85,35 +86,38 @@ namespace 'Cylon.IO', ->
 
     # Creates the GPIO file to read/write from
     _createGPIOPin: () ->
-      FS.writeFile @_exportPath(), "#{ @pinNum }", (err) =>
+      FS.writeFile(@_exportPath(), "#{ @pinNum }", (err) =>
         if err
-          @emit 'error', 'Error while creating pin files'
+          @emit('error', 'Error while creating pin files')
         else
           @_openPin()
+      )
 
     _openPin: () ->
-      @_setMode @mode, true
-      @emit 'open'
+      @_setMode(@mode, true)
+      @emit('open')
 
     _closeCallback: (err) ->
       if err
-        @emit 'error', 'Error while closing pin files'
+        @emit('error', 'Error while closing pin files')
       else
-        @emit 'close', @pinNum
+        @emit('close', @pinNum)
 
     # Sets the mode for the GPIO pin by writing the correct values to the pin reference files
     _setMode: (mode, emitConnect = false) ->
       @mode = mode
       if mode is 'w'
-        FS.writeFile @_directionPath(), GPIO_DIRECTION_WRITE, (err) =>
+        FS.writeFile(@_directionPath(), GPIO_DIRECTION_WRITE, (err) =>
           @_setModeCallback err, emitConnect
+        )
       else if mode is 'r'
-        FS.writeFile @_directionPath(), GPIO_DIRECTION_READ, (err) =>
+        FS.writeFile(@_directionPath(), GPIO_DIRECTION_READ, (err) =>
           @_setModeCallback err, emitConnect
+        )
 
     _setModeCallback: (err, emitConnect) ->
       if err
-        @emit 'error', "Setting up pin direction failed"
+        @emit('error', "Setting up pin direction failed")
       else
         @ready = true
         @emit('connect', @mode) if emitConnect