Security

Health monitoring
Using a MEMS sensor medical devices like pace makers can adapt to the activity of the patient. Further more, blood pressure can be measured invasively or non-invasively. Acceleration data coming from different parts of the body can monitor the evolution of a disease, for example before and after therapeutic treatment.
Context awareness
Devices may require dedicated setup or specific fine tuning to enhance performance and they are usually managed through the menu functions.  However, now using MEMS these devices can sense the context it is in and react accordingly.  For instance, users no longer need to switch on or off the ring tones manually on their phone.  By simply placing the phone upside down the ringer can be switched off.  Projectors can sense angles or positions and adjust the picture accordingly.
Alarms
Antitheft alarms based on MEMS accelerometers can detect movement in any desired access, protecting briefcases, laptops and other mobile hardware from unauthorized removal.  Normal movements can easily be distinguished from suspect activity, minimizing false alarms.