We started with aim to determine 3-dimesional orientation of sensor in free space. We worked on signal processing in MATLAB to make real time data noise free by low pass filtering on windowed signal. We got good results (as shown in Fig. ) but only for slow movements. With fast movements the averaging of data was affecting magnitude of acceleration so no real movements were observed. We tried different integrations to minimise cumulative errors. This was our first attempt towards possibility of inertial sensor towards gesture recognition which got fair enough results. We tested sensor for its accuracy under different condition & found that it is more accurate for rotational motion than static as its principle of operation much favours earlier thing. That’s why it is well used in tilt based keyless PDA (Personal Digital Assistant).