SUPER SENSITIVE
INDUSTRIAL SECURITY SYSTEM WITH AUTO-DIALER
AND 60dB LOUD
SIREN
TECHNICAL SPECIFICATIONS:
Title of the project : Embedded Industrial Security System with
Auto-Dialer
using 89S52 Microcontroller
Domain : Embedded Systems Design
Software : Embedded C, Keil, Proload
Microcontroller : AT89S52
Power Supply : +5V,
500mA Regulated Power Supply
Display : LED
5mm
Security Channels : 8
Access Sensor : Reed Switch / Magnetic sensors, IR
Sensor
Vibration Sensor : Piezo Electric sensor
Panic Alert : Push-to-on
switch
Light Detector : LDR
Auto Dialer : Redial
on telephone key pad
Applications : Industries,
Banks, Jeweler Shops, Home security
SUPER SENSITIVE INDUSTRIAL SECURITY SYSTEM
WITH AUTO-DIALER
AND 60dB LOUD SIREN
ABSTRACT:
Security is primary concern for every one. This
Project describes a design of effective security alarm system that can monitor an
industry with eight different sensors. Unauthorized access, Fire accident, wall
braking, IR detection, and fire detection can be monitored by the status of
each individual sensor and is indicated with an LED. This LED shows whether the
sensor has been activated and whether the wiring to the sensor is in order.
Obviously, this burglar alarm also has an input to 'arm' the alarm, a tamper
input and a couple of outputs to control a siren and Auto dialing system. The alarm is also fitted with a so-called
'panic button'.
The burglar
alarm is built around the AT89S52 micro controller from Atmel. This micro
controller provides all the functionality of the burglar alarm. It also takes
care of filtering of the signals at the inputs. Only after an input has
remained unchanged for 30 milliseconds, is this new signal level passed on for
processing by the micro controller program. This time can be varied by adopting
small changes in the source code.
A maximum of 8
sensors can be connected to the burglar alarm. These sensors need to have their
contacts closed when in the inactive state (i.e. Normally Closed). In addition,
each sensor needs to have its tamper connection wired as well. A power supply
voltage of +5 VDC is available for
each sensor at the corresponding wiring terminals.
Eight LEDs indicate the status of the
corresponding sensors. When the alarm has been activated, the LED of the sensor
that caused the alarm will light up, or flash in the event of a cable failure.
When the alarm is armed, the LED 'alarm
armed' will flash during the exit-delay. After the exit-delay, the LED will
light continuously. The LED 'alarm triggered LED' flashes during the
entry-delay and will turn on continuously once an actual alarm has been
generated. 'Alarm triggered LED’ turns off only when the alarm is switched off
with key switch Sw1. When an alarm has taken place, it can be determined
afterwards which sensor (or tamper input) caused the alarm to trigger. The LED
'tamper' lights up when the tamper input is opened. This LED will also continue
to be on until the alarm is switched off.
The uniqueness of this project is not only
alerting the neighbors by siren, it also dials a mobile number which is already
programmed into the system. A mobile number or a land line number can be
programmed into the system. As this system works on existing telephone line, it
can dial the number even the subscriber is out of station.
This project uses regulated 5V, 500mA
power supply. 7805 three terminal voltage regulator is used for voltage
regulation. Bridge type full wave rectifier is used to rectify the ac out put
of secondary of 230/12V step down transformer.
Block Diagram:
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