Wednesday, June 4, 2008


Human Interfacing Device is key area in modern electronics era. Gesture recognition can be well introduced in modern day computers to play 3-D games. Virtual Reality is not far away from our doorsteps. Simple inertial navigation sensor like accelerometer can be utilized in getting Dynamic or Static acceleration profile of movement to move cursor of mouse or Gyroscope to even rotate 3-D object.

We propose a technique on same principle to convert acceleration profile of accelerometer into distance with double integration. Accuracy might be issue as errors keeps on adding in double integration but with robust signal processing it would not create problems. Only limitation will be in movements that cause little acceleration which puts upper limit on sensitivity of sensor. (In mill volts per g, g= 9.8m/s2)

Measure challenge in this technique is to somehow separate out Dynamic & Static response of accelerometer to differentiate between Rotational & Static movements.

On similar basis tilt based movement can be mapped onto cursor movement of mouse. This introduces entirely different technology in navigation compared to earlier Ball mouse with optocoupler or latest optical image processing based mouse. For smooth navigation we added CYWM 6935 wireless module with 50m range.

Simple low cost, low power inertial sensor based mouse with wireless capability will provide ease of use. It can also be converted to be useful in 3-D gaming application. It can be well used in Gesture Recognition with additional gyroscope with complete 6–Degrees of freedom.

So, next time onwards while explaining PPT on projector our professors will just rotate their wrists far away from computers….?

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