gk-arduino.html

<element name="gk-arduino">

  <template>
    <div id="{{id}}" device="{{device}}"></div>
  </template>

  <script>
  function getBtConnection(device) {
    return bluetoothSerial;
  }

  function generateOnError(cause) {
    return function(err) {
      this.status = cause + ': ' + JSON.stringify(err);
      this.$ele.trigger('error', [this.status]);
    };
  }

  registerElement('gk-arduino', {

    device: '',

    status: 'disconnected',

    _connection: null,

    _pinMappings: {},

    init: function() {
      this.device = this.$ele.attr('device');
      this._connection = getBtConnection(this.device);
      this._connection.subscribe("\n\n", this._dispatch, generateOnError('Subscribe Failed').bind(this));
      this.connect();
    },

    connect: function() {
      this.status = 'connecting';
      var self =this;
      this._connection.connect(this.device, this._onconnect.bind(this) , this._ondisconnect.bind(this));
    },

    _onconnect: function() {
      this.status = 'connected';
      this.$ele.trigger('ready', [this.arduino()]);
    },

    disconnect: function() {
      this.status = 'disconnecting';
      this._connection.disconnect(this._ondisconnect);
    },

    _ondisconnect: function(cause) {
      this.status = 'disconnected';
      this.$ele.trigger('disconnect');
    },

    sendData: function(data) {
      this._connection.write(data);
    },

    _dispatch: function(data) {
      var lines = data.split('\n');
      if (lines.length === 3) {
        switch (lines[0]) {
          case 'digitalRead':
            var handler = this._pinMappings[lines[1]];
            if (typeof handler === 'function') {
              handler.apply(null, lines[2]);
            }
            break;
          default:
            break;
        }
      }
    },

    arduino: function() {
      var self = this;
      return {
        pinMode: function(pin, mode) {
          self.sendData('pinMode\n' + pin + '\n' + mode + '\n\n');
        },
        digitalWrite: function(pin, value) {
          self.sendData('digitalWrite\n' + pin + '\n' + value + '\n\n');
        },
        digitalRead: function(pin, callback) {
          self._pinMappings[pin] = callback;
        }
      };
    }

  });
  </script>

</element>