Disabling of mobile phone in restricted areas using 8051 micro-controller

download Disabling of mobile phone in restricted areas using 8051 micro-controller

of 24

  • date post

  • Category


  • view

  • download


Embed Size (px)


This is a project to overcome noise pollution in the restricted area through mobile phone.

Transcript of Disabling of mobile phone in restricted areas using 8051 micro-controller

ABSTRACTThis method uses external circuits that are to be added into the Cell Phones, which has many categories, where all the drawbacks are being put forth. This project is considered as commercial and more practical. The input jamming signal frequency is in the order of 400Mhz. The deactivation of LCD panel and speaker is done through a micro controller 89c51. This project gives total solution for both the customers and the network service providers. Whereas in conventional jammers the user gets totally no signal message, in our project this problem is avoided so important calls are not missed.

EXISTING SYSTEM: Jammers fully disconnects the conenction between the mobile node and the Base station. Jammers interferes in other wireless networks also. Jammers will cause huge loss to service providers.


In this Project, we are modifying the jammer concept because of this we have two advantages, one is that we get rid of legal problems because we have to use 900 MHZ oscillators the other one is that we let the mobile user to know the caller identity.



400 Mhz tx

400 Mhz rx


Micro controller



Display section



Literature Review Microcontroller (ATMEL 89C51)

I/O Ports Port 0 Port 1 Port 2 Port 3 (8 lines) (8 lines) (8 lines) (8 lines)

FEATURES OF 89C51 It is a low-power, high-performance. CMOS 8-bit micro computer. 128 x 8-Bit Internal RAM. Two 16-Bit Timer/Counters. Programmable Serial Channel. Low Power Idle and Power Down Modes. 32 Programmable I/O Lines. Six Interrupt Sources.




The basic functionality of our project could be divided into following two sections. Transreceiver Transmitter Section Receiver Section (in mobile device)

Transmitter section:The transmitter section consist transmitter in omni direction. of 400 mhz

Receiver sectionThe Receiver section consist of 400 mhz receiver which is interfaced with the


CIRCUIT EXPLANATION When they gets the signal from the receiver receives the signal and decode the signal and compare the predefined value and then it does the de activation of key board and speaker as long as the person is inside the coverage distance of the jammer.

HT-12E ENCODERFeaturesOperating voltage:2.4V~12V for the HT12E Low power and high noise immunity CMOS technology Minimum transmission words of 4 words for the HT12E Built-in oscillator needs only 5% resistor Data code has positive polarity Minimal external components HT12E: 18-pin DIP/20-pin SOP package

DESCRIPTIONThe 2^12 encoders are a series of CMOS LSIs for remote control system applications. They are capable of encoding information which consists of N address bits and 12N data bits. Each address/data input can be set to one of the two logic states. The programmed addresses/data are transmitted together with the header bits via an RF transmission medium . Transmission is enabled by applying a low signal to the TE pin.


It also operates at 433.92MHz, and has a sensitivity of 3uV. It operates from 4.5 to 5.5 voltsDC, It has both linear and digital outputs.

HT12D DECODEROperating voltage: 2.4V~12V Low power and high noise immunity CMOS technology Low standby current Capable of decoding 12 bits of information Binary address setting Received codes are checked 3 times Address/Data number combination - HT12D: 8 address bits and 4 data bits Built-in oscillator needs only 5% resistor Valid transmission indicator Easy interface with an RF transmission medium Minimal external components Pair with Holtek's 212 series of encoders 18-pin DIP, 20-pin SOP package

MERITS: No loss for service providers. The identity of the caller is shown in the display. No interference created to any electronic deivce. No license problem at 400 MHZ carrier frequency.

APPLICATIONS Mostly in Educational institutes and temples and conference halls With some modifications we can provide this service in industries or in secured places during the restricted hours/timings.

FUTURE ENHANCEMENTS The circuit may be designed with ASIC. By increasing the coverage distance the jamming device will become still efficient. May be the identity of the user can be detected.

Work ScheduleReview 11. 2.

Review 21.

Review 3Implementation of our project.


Selection of Project. Study of programming concepts of microcontroller. Study of basic concepts of all sensors.


Preparation of hardware system. Integrating internal system through program.