HIH6130 temperature and humidity from a Tessel 2 (I2C).

hih61xx.js

// Hardware access
var tessel = require( 'tessel' );

// Sensor values
var humidity = null;
var temperature = null;

// Sensor
// Default address
var hih = tessel.port['B'].I2C( 0x27 );

// Reading
function update() {
  hih.transfer( new Buffer( 0x2F ), 4, function( error, data ) {
    var raw_humidity = null;
    var raw_temperature = null;
	
    if( !error ) {
      // First two bytes for humidity
      // In the range ( 2^14 - 1 )
      raw_humidity = ( ( data[0] & 0x3f ) << 8 ) | data[1];
      humidity = raw_humidity / 16382;

      // Second two bytes for temperature
      // In the range ( 2^14 - 1 )
      // Multiply by 165 and subtract 40
      // Because that is what the documentation says
      raw_temperature = ( ( data[2] << 8 ) | data[3] ) >> 2;
      temperature = ( raw_temperature / 16382 ) * 165 - 40;
		
      // Display
      console.log( temperature );
      console.log( humidity );
    } else {
      console.log( error );
    }
  } );	
}

// Read values once per second
var interval = setInterval( function() {
  update();
}, 1000 );