Electronic Compass and Tilt/Roll sensors with USB and I²C outputs. With two KMZ51 and one ADXL320 sensors. Interfaces= USB, RS232 and I²C Compass Resolution= 1° ,Accuracy= 3°. Tilt/Roll Resolution= 2° ,Accuracy= 3° after calibration. An optional LCD can be connected directly onto the module. Can be powered by USB cable or by external source. Comes with an example windows application. The optional LCD is available here: Nokia 3310 LCD. And here are more details about how to use these modules: TD-CMP project example. You may also be interested in the CCS c source code.