Implementation of high sensitive GSM signal detector with audio visual alert
indication
Technical Specifications:
Title of the project
:
Implementation of high sensitive GSM signal detector with audio visual
alert indication
Domain
Embedded Systems Design
:
Power Supply
:
Display
12v, 500mA Regulated Power Supply
:
LED
Controller
:
LED
:
Buzzer
:
Buzzer for beep indication
Applications
:
Seminar halls
AT89S52
5mm
Developed By
M/S Wine Yard Technologies
Phone
040- 6464 6363, www.WineYardProjects.com
Wine Yard Technologies,#8-3-903/8, G1 &G2, Tarakarama Estates, Lane Opp. RS Brothers, Ameerpet, Hyderabad-500073. Ph: 040-6464 6363, 6625 6695
email:info@wineyardtechnologies.com
ABSTRACT:
This handy, pocket-size GSM transmission detector can sense the
presence of an activated mobile phone from a distance. So it can be used to prevent use of
mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use
of mobile phone for spying and unauthorized video transmission.
The circuit can detect the incoming and outgoing calls, SMS and video
transmission even if the mobile phone is kept in the silent mode. The moment the bug detects RF
transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED
blinks. The alarm continues until the signal transmission ceases.
An ordinary RF detector using tuned LC circuits is not suitable for
detecting signals in the GHz frequency band used in mobile phones. The transmission frequency
of mobile phones ranges from 0.9 to 3 GHz with a wavelength of 3.3 to 10 cm. So a circuit
detecting gigahertz signals is required for a mobile detector.
When the mobile phone signal is detected the frequency of the signal as indicated by
LED. In this project we are using AT89S52 MCU. Once the GSM signal is detected
automatically a audio visual alert indication with a signal detected message will be displayed on
16X2 LCD.
This project uses regulated 12v 500mA power supply. 7812 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:
Wine Yard Technologies,#8-3-903/8, G1 &G2, Tarakarama Estates, Lane Opp. RS Brothers, Ameerpet, Hyderabad-500073. Ph:
040-6464 6363, 6625 6695 email:info@wineyardtechnologies.com
Power
Supply
16X2 LCD
RF ANTENNA
89S52
MCU
Buzzer
Crystal
Wine Yard Technologies,#8-3-903/8, G1 &G2, Tarakarama Estates, Lane Opp. RS Brothers, Ameerpet, Hyderabad-500073. Ph:
040-6464 6363, 6625 6695 email:info@wineyardtechnologies.com