MEMS based PC Control using Hand Signals:

Micro-electro-mechanical systems (MEMS) are microscopic mechanical systems coupled with electric or electronic circuits.
MEMS  have  been  extensively  used  as  micro-scale  high-quality  oscillators,  communication  resonators,  microphones,
amplifiers and other micro-oscillators.In this investigation, mathematical model of a micro-mechanical resonator is developed
subject to a full nonlinear model.The output signal of MEMS is not reliable when it's operating in a saturated or in an instable
region. From a design viewpoint, a stability chart is needed to indicate the relationship between the parameters to determine
when the system is stable,periodic,or unstable.Nondimensional and linearized model of the MEMS is studied and a stability
diagram  is  developed  for  the  system.  The  analysis of micro-electro-mechanical structures is addressed focusing on the
evaluation of damping forces exerted by the surrounding gas on moving parts

In  our  project we are going to create the PC commands using MEMS technology. The MEMS sensor placed in the Human
hands. Here the MEMS sensor gives the analog signal for the corresponding X-Y-Z axis. Interface the signal to the controller
with  the  use  of  analog to digital converter. Then the Controller sends the command signal to the PC with the use of serial
communication. Here  we  have  programmed  already  in the controller for generating the command signal for corresponding
X-Y-Z axis.

Block Diagram:

Voice based Wheel Chair Control for the Disabled:

This project, “Wheel Chair Control Using Voice Signals For Disabled Patients” presents a robotic wheelchair for the disabled
persons. The  body-supporting  device  for  handicapped  person is characterized as two sets, first set of two rigid segments,
each  mounted  on  the  backrest  by  an articulated system which blocks the segment in a vertical orientation as armrest or
horizontal orientation, and the second  set has two cradle elements, adapted to be immobilized in the same horizontal plane
in alignment to form open leg guards fitting over the front of the persons legs.

The wheelchair is controlled by means of voice. Using  this  wireless  communication, a virtual network can be created. This
eliminates the complexity of wired networks and suits  well  for  short  distance communication. The wheelchair is protected
by sensors. So this application can be extended for the blind persons.

Block Diagram:

Transmitter Section:

Receiver Section: