This solves the problem (http://forum.balanduino.net/index.php?topic=47.0), however, create another, if you can not keep the sensor coupled to the Arduino board you must create a dedicada board with a ATMega to capture sensor data and send it to the main board, there arises another problem, interference can also affect communication between dedicated board and the Arduino board if you use the serial interface, in this case, the solution is implement a communication protocol. To make this solution more efficient leave the dedicated board to perform the treatment of the sensor signal and the Kalmann filter, only sending results. I'm trying to do this.