BMP085 Digital Barometric Pressure Sensor


 * https://www.sparkfun.com/products/11282
 * http://dx.com/p/6956-bosch-bmp085-digital-air-temperature-and-barometric-pressure-sensor-module-blue-158296

Arduino code :
 * http://code.google.com/p/bmp085driver/
 * https://www.sparkfun.com/tutorial/Barometric/BMP085_Example_Code.pde