10-04-2012, 11:18 AM
KNOCK/VIBRATION ACTIVATED ALARM
KNOCK.pptx (Size: 315.38 KB / Downloads: 248)
INTRODUCTION
This inexpensive project can be used as a vibration activated alarm. Sensor plate can be fixed on table, door, cupboard, windows for sensing any type of vibrations.
WORKING PRINCIPLE
Piezoelectric sensor plates convert mechanical vibrations into electrical vibrations.
These electrical pulses are undergone amplification by transistor amplifier stages.
APPLICATIONS
This alarm can be used to protect car and other vehicles.
Other application of this project is an earthquake warning alarm.