Automatic theft controller system using burglar alram
INTRODUCTION:Burglar alarm is the one of thesecurity system which is use toprevent our home, office, banks, etc.In our project burglar alarm ismainly used to find out the theft andit can also give the signal to the useror owner by using of the mobilephones. So the theft can be avoidedand the thief also will be caught.
The concept of burglar alarms wasintroduced to the world by . Holmes made these alarmsan important component of businessand residential security. In 1905,after enjoying several years ofsuccessful business, Holmes sold theconcept of burglar alarms and hiscompany to American Telephone andTelegraph Company (AT&T). AT&Tthen went a step further andconnected burglar alarms toemergency call systems at both fireand police departments.
. Burglar alarms are systems designed to detect unauthorized entry into a building or area. They consist of an array of sensors, a control panel and alerting system, and interconnections Sensors detect intruders by many methods such as monitoring door and window contacts by Sensors may be directly wired to a control panel that provides sensor power, or may communicate wirelessly.
LET’S GET THE BASICSTRAIGHT.(BEFORE “THEY “ DO)
Step 1: Try andcatch the burglarat the door step itself,
o The burglar only needs to close the door again to turn the buzzer off. Thats whymost modern burglar alarms incorporate another piece into the circuit -- thecontrol box.oThe control box is hooked up to one or more alarm circuits, but it alsohas its own power supply.oBut once the alarm is triggered, the control box wont cut it off until somebodyenters a security code at a connected keypad.oIt monitors the circuits and sounds the alarm when they are closed or opened(depending on the design).oFor added security, the control box is usually positioned in an out-of-the-way spot,so the intruder cant find it and attempt to destroy it..
I n this basic circuit, the alarm will beswitched on under the following fourdifferent conditions:1. When light falls on LDR1 (at theentry to the premises).2. When light falling on LDR2 isobstructed.3. When door switches are opened or awire is broken.4. When a handle is touched.
short circuits these spikes before they can do any damage. >To avoid this adjust potentiometer VR3 properly.