Added IR receiver support

Software/NodeJS/libs/commands.js

@@ -73,6 +73,12 @@ module.exports = {
   // Sets leds similar to a bar graph, reversible
   , chainableRgbLedSetLevel                     : [95]
 
+  // Grove IR sensor
+  // Read the button from IR sensor
+  , irRead                                      : [21]
+  // Set pin for the IR reciever
+  , irRecvPin                                   : [22]
+
   // This allows us to be more specific about which commands contain unused bytes
   , unused                                      : 0
 };

Software/NodeJS/libs/index.js

@@ -18,5 +18,6 @@ module.exports.GrovePi = {
     , RTCI2C: require('./sensors/rtcI2cSensor')
     , TemperatureAnalog: require('./sensors/temperatureAnalogSensor')
     , UltrasonicDigital: require('./sensors/ultrasonicDigitalSensor')
+    , IRReceiver: require('./sensors/IRReceiverSensor')
   }
 }

Software/NodeJS/libs/sensors/IRReceiverSensor.js

@@ -0,0 +1,33 @@
+var util         = require('util')
+var Sensor       = require('./base/sensor')
+var commands     = require('../commands')
+
+function IRReceiverSensor(pin) {
+  pin += 1
+  Sensor.apply(this, Array.prototype.slice.call(arguments))
+  this.pin = pin
+}
+util.inherits(IRReceiverSensor, Sensor);
+IRReceiverSensor.prototype = new DigitalSensor()
+
+IRReceiverSensor.prototype.read = function() {
+  this.write(commands.unused)
+  var writeRet = this.board.writeBytes(commands.irRead.concat([commands.unused, commands.unused, commands.unused]))
+  if (writeRet) {
+    this.board.readByte()
+    var bytes = this.board.readBytes(22)
+    if (bytes instanceof Buffer && bytes[1] != 255) {
+      bytes.slice(0,1)
+      return bytes
+    } else {
+      return false
+    }
+  } else {
+    return false
+  }
+}
+IRReceiverSensor.prototype.write = function(value) {
+  return this.board.writeBytes(commands.irRecvPin.concat([this.pin, value, commands.unused]))
+}
+
+module.exports = DigitalSensor