remove dependency on T1 hardware

Author: Frijol

examples/button.js

@@ -3,7 +3,7 @@
 
 var tessel = require('tessel');
 var buttonLib = require('../');
-var myButton = buttonLib.use(tessel.port['GPIO'].pin['G3']);
+var myButton =  buttonLib.use(tessel.port['A'].pin[2]);
 
 var i = 0;
 
@@ -12,7 +12,7 @@ myButton.on('ready', function () {
     i++;
     console.log('Press', i);
   });
-  
+
   myButton.on('release', function () {
     i++;
     console.log('Release', i);

index.js

@@ -5,40 +5,23 @@ var EventEmitter = require('events').EventEmitter;
 // Constructor function to instantiate the hardware object
 function Button (hardware, callback) {
   var self = this;
-  
-  // Check to ensure proper hardware has been passed in
-  if (typeof hardware.pin != 'number') {
-    // Pin not specified
-    var error = new Error("Specify a pin, e.g. tessel.port['GPIO'].pin['G3']");
-    self.emit('error', error);
-    if(callback) {
-      callback(error);
-    }
-  } else if ([16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 34, 35, 36, 37, 38, 39].indexOf(hardware.pin) < 0) {
-    // Not a digital pin
-    var error = new Error('Specified pin is not a digital pin: ' + hardware.pin);
-    self.emit('error', error);
-    if(callback) {
-      callback(error);
-    }
-  }
 
   // Set hardware connection of the object
   self.hardware = hardware;
-  
+
   // Object properties
   self.delay = 100;
   self.pressed = false;
-  
+
   // Begin listening for events
   self.hardware.on('fall', function () {
     self._press();
   });
-  
+
   self.hardware.on('rise', function () {
     self._release();
   });
-  
+
   // Make sure the events get emitted, even if late
   setInterval(function () {
     if(!self.hardware.read()) {
@@ -47,7 +30,7 @@ function Button (hardware, callback) {
       self._release();
     }
   }, self.delay);
-  
+
   // Emit the ready event when everything is set up
   setImmediate(function emitReady() {
     self.emit('ready');
@@ -63,7 +46,7 @@ util.inherits(Button, EventEmitter);
 
 Button.prototype._press = function () {
   var self = this;
-  
+
   if(!self.pressed) {
     self.emit('press');
     self.pressed = true;
@@ -72,7 +55,7 @@ Button.prototype._press = function () {
 
 Button.prototype._release = function () {
   var self = this;
-  
+
   if(self.pressed) {
     self.emit('release');
     self.pressed = false;