ARM59
www.wineyard.in
Implementation of high sensitive GSM signal detector with audio
visual alert indication using ARM7 TDMI processor based
LPC2148 controller
TECHNICAL SPECIFICATIONS
: Implementation of high sensitive GSM signal detector with
audio visual alert indication Using ARM7 TDMI Processor based
LPC2148 microcontroller
Domain
:
Embedded Systems
Software
:
Embedded C, Keil, Flash Magic
Microcontroller
:
LPC2148 controller
Power Supply
:
+12V, Lead Acid Battery, 3.3V for LPC2148
Buzzer
:
Buzzer for beep indication
Display
:
LED 5mm
Crystal
:
12MHz
Applications
:
Seminar halls
Developed By
:
M/S Wine Yard Technologies
Phone
:
040-6464 6363, www.WineYard.in
ABSTRACT:
Hyderabad: Tarakarama Estates, 2nd Left Lane – Opp. RS Brothers, Ameerpet, Hyderabad-500073
www.WineYard.inPh: 040-6464 6363, 6625 6695, 888 5555 212
Title of the project
ARM59
www.wineyard.in
This handy, pocket-size mobile 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
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 bug.
When the mobile phone signal is detected by op-amp, the output of op-amp becomes high
and low alternately according to the frequency of the signal as indicated by LED. This triggers
mono stable timer to which we connect the Buzzer circuit.
The LPC2148 are based on a 16/32 bit ARM7TDMI-S™ CPU with real-time emulation
and embedded trace support, together with 128/512 kilobytes of embedded high speed flash
memory. A 128-bit wide memory interface and unique accelerator architecture enable 32-bit
code execution at maximum clock rate. For critical code size applications, the alternative 16-bit
Thumb Mode reduces code by more than 30% with minimal performance penalty. With their
compact 64 pin package, low power consumption, various 32-bit timers, 4- channel 10-bit ADC,
USB PORT,PWM channels and 46 GPIO lines with up to 9 external interrupt pins these
microcontrollers are particularly suitable for industrial control, medical systems, access control
and point-of-sale. With a wide range of serial communications interfaces, they are also very well
suited for communication gateways, protocol converters and embedded soft modems as well as
many other general-purpose applications.
Hyderabad: Tarakarama Estates, 2nd Left Lane – Opp. RS Brothers, Ameerpet, Hyderabad-500073
www.WineYard.inPh: 040-6464 6363, 6625 6695, 888 5555 212
even if the mobile phone is kept in the silent mode. The moment the bug detects RF transmission
ARM59
www.wineyard.in
This project uses two power supplies, one is regulated 5V for modules and other one is
3.3V for LPC2148. 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
www.WineYard.inPh: 040-6464 6363, 6625 6695, 888 5555 212
transformer.
Hyderabad: Tarakarama Estates, 2nd Left Lane – Opp. RS Brothers, Ameerpet, Hyderabad-500073
ARM59
www.wineyard.in
Power
Supply
Contrast
Block Diagram:
R
Signal Generator
ARM7TDM
I/LPC2148
CONTROLL
ER
Buzzer
Crystal
Power supply:
Hyderabad: Tarakarama Estates, 2nd Left Lane – Opp. RS Brothers, Ameerpet, Hyderabad-500073
www.WineYard.inPh: 040-6464 6363, 6625 6695, 888 5555 212
16X2 LCD