i2cdetect

now using a version that returns an array of ids

var isDevice = function isDeviceOnBus(i2cBus,id) {
      try {
          return i2cBus.readFrom(id,1);
      }
      catch(err) {
          return -1;
      }
};

var detect = function(i2c,first, last) {
      first = first | 0;
      last = last | 0x77;
      var idsOnBus = Array();
      for (var id = first; id < last; id++) {
          if ( ! isDevice(i2c,id) ) {
              idsOnBus.push(id);
          }
      }
      return idsOnBus;
};


I2C1.setup({sda: D4, scl: D5} );
console.log(detect(I2C1));