johnny-five/lib/receiver.txt

Firmata based Arduino Programming Framework.

/**
 * Receiver, IR.Receiver
 * @param {Object} opts Options: pin
 */

 IR.Receiver = function( opts ) {

  if ( !(this instanceof IR.Receiver) ) {
    return new IR.Receiver( opts );
  }

  var settings, capture, start, started, range, last, samples, median;

  last = null;
  samples = [];

  // TODO:
  //  Switch to using
  //  Board.Device.call( this, opts );
  //
  opts = Board.options( opts );

  // Hardware instance properties
  this.board = Board.mount( opts );
  this.firmata = this.board.firmata;
  this.pin = opts && opts.pin || 9;

  // Receiver instance properties
  //
  //
  this.freq = opts.freq || 100;
  // this.microseconds = null;

  start = 2200;
  range = [ 400, 1000 ];


  // Private settings object
  settings = {
    pin: this.pin,
    value: this.firmata.LOW
    //,
    //timeout: 65
    //,
    // pulseOut: 11
  };

  this.firmata.setMaxListeners( 10000 );
  // Interval for polling pulse duration
  setInterval(function() {
    this.firmata.pulseIn( settings, function( value ) {
      var i, result, data;

      result = 0;


      if ( value === 0 ) {
        capture = false;
      }
      if ( value > start ) {
        capture = true;
        started = value;
      }

      if ( capture && value > start ) {
        samples = [];
      }

      if ( capture && started !== value ) {

        // if ( value !== last ) {
          // console.log( value );
          samples.push( value );
        // }

        if ( samples.length === 11 ) {
          data = samples.slice(0);
          samples = [];
          result = 0;

          for ( i = 0; i < 11; i++ ) {

            if ( data[ i ] > 1000 ) {
              data[ i ] = 1;
            } else if ( data[ i ] > 400 ) {
              data[ i ] = 0;
            } else {
              // return -1;
            }
          }

          for ( i = 0; i < 11; i++ ) {
            if ( data[ i ] === 1 ) {
              result |= ( 1 << i );
            }
          }

          console.log( result );
        }

        last = value;
      }

    }.bind(this));
  }.bind(this), 10 );
};


util.inherits( IR, events.EventEmitter );