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Friday, 21 May 2010

GSM Based Home Security System -abstract,report

GSM Based Home Security System


Home security has been a major issue where crime is increasing and everybody wants to take proper measures to prevent intrusion. In addition there was a need to automate home so that user can take advantage of the technological advancement in such a way that a person getting off the office does not get melted with the hot climate.


The project is aimed at developing the security of Home against Intruders , Gas Leak and Fire . In any of the above three cases any one met while you are out of your home than the device sends SMS to the emergency no provided to it.

The report consists of a background into the area of 8051 microcontroller and mobile communication, how they are interfaced to each other and AT (Attention) commands set used in communication.


1. AT command supporting GSM mobile phone.

2. 89S52 Microcontroller

3. Max 232 IC.

4. Relays

5. Relay driver IC ULN 2803

6. Voltage regulator 7805.

7. Diode IN4007

8. GSM Phone

9. LPG Gas Sensor


1. Keil u-Vision 3.0

Keil Software is used provide you with software development tools for 8051 based microcontrollers. With the Keil tools, you can generate embedded applications for virtually every 8051 derivative. The supported microcontrollers are listed in the µ-vision

2. PRO51 Programmer Software


In this project we interfaced 8051 microcontroller with Motorola’s C168 GSM mobile phone to decode the received message and do the required action. The protocol used for the communication between the two is AT command.

The microcontroller pulls the SMS received by phone, decode it, recognizes the

Mobile no. and then switches on the relays attached to its port to control the appliances. After successful operation, controller sends back the acknowledgement to the user’s mobile through SMS.

AT-Command set

The following section describes the AT-Command set. The commands can be tried out by connecting a GSM modem to one of the PC’s COM ports. Type in the test-command, adding CR + LF (Carriage return + Line feed = \r\n) before executing. Table gives an overview of the implemented AT-Commands in this application. The use of the commands is described in the later sections.

AT-Command set overview




Check if serial interface and GSM modem is working.


Turn echo off, less traffic on serial line.


Display of new incoming SMS.


Selection of SMS memory.


SMS string format, how they are compressed.


Read new message from a given memory location.


Send message to a given recipient.


Delete message.


When we have to learn about a new computer we have to familiarize about the machine capability we are using, and we can do it by studying the internal hardware design (devices architecture), and also to know about the size, number and the size of the registers.

A microcontroller is a single chip that contains the processor (the CPU), non-volatile memory for the program (ROM or flash), volatile memory for input and output (RAM), a clock and an I/O control unit. Also called a "computer on a chip," billions of microcontroller units (MCUs) are embedded each year in a myriad of products from toys to appliances to automobiles. For example, a single vehicle can use 70 or more microcontrollers. The following picture describes a general block diagram of microcontroller.

89s52: The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro-grammer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller, which provides a highly flexible and cost-effective solution to many, embedded control applications. The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM con-tents but freezes the oscillator, disabling all other chip functions until the next interrupt

The hardware is driven by a set of program instructions, or software. Once familiar with hardware and software, the user can then apply the microcontroller to the problems easily.

The pin diagram of the 8051 shows all of the input/output pins unique to microcontrollers:

The following are some of the capabilities of 8051 microcontroller.

ü Internal ROM and RAM

ü I/O ports with programmable pins

ü Timers and counters

ü Serial data communication

The 8051 architecture consists of these specific features:

§ 16 bit PC &data pointer (DPTR)

§ 8 bit program status word (PSW)

§ 8 bit stack pointer (SP)

§ Internal ROM 4k

§ Internal RAM of 128 bytes.

§ 4 register banks, each containing 8 registers

§ 80 bits of general purpose data memory

§ 32 input/output pins arranged as four 8 bit ports: P0-P3

§ Two 16 bit timer/counters: T0-T1

§ Two external and three internal interrupt sources Oscillator and clock circuits.













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  3. can u please post the program codes in c for this project......?

  4. its was very helpful...thanx for sharing...God bless you

  5. I m also doing same project, but we are not success. We r facing problem in the serial communication. Serial communication is working between microcontroller and the pC but when connected with the GSM mode it does not work. plz help me.....

  6. hi please send me circuit and programm code and more detail pls my e-mail is i want to try make it

  7. a final year student of electronics and communication engineering..can u send me the circuit diagram and the program code.t will be very useful for my project..plz help....mail to

  8. thanku.. for sharing..Am a btech student .can u send me d circuit diagram and the program code.plz help...maiol to

  9. thankU can plz send me circuit diagram and program code to i'll be great full.. this is my last semester and i am working on this project . i really need it plz

  10. please mail all instructions regarding project.

  11. hi, i just want to know the approximate cost of the above project.plz reply

  12. hi please send me circuit and programm code and more detail pls my e-mail is i want to try make it

  13. am a final year student and this sute is very informative.please send me the circuit diagram and the programming code so that i can implement the project.

  14. am a final year student please send me progrmming code using gsm

  15. my E mail ID --
    hey ,,,, please send me whole information regarding GSM-BASED-HOME-SECURITY-SYSTEM ...... i need it urgently ........

  16. send me d details on
    plzzz its urgent!!!

  17. Ur Work is realy helpful as i'm making cellphone operated automated vehicle.. i'm facing problem with serial communication so please mail me ( the brief report on ur projet

  18. would you plz send me entire information including circuit diagram and programming codes on this GSm based home security system...i need ie for my final year email id is (

  19. pls send me the detail of this project ....i wnt to make this for my final year (this year).

  20. would you plz send me entire information including circuit diagram, total cost and programming codes on this GSm based home security system...i need ie for my final year email id is (

  21. please send me the circuit diagram and c codes for this project i am trying to do this project please send me detailed content of this project

  22. m final yr studnt of ec branch.. pls send me circuit diagrm, codngs nd othr relatd information on ... i really need it..

  23. please send me the whole information about this project. I'm at final year student pls send me circuit diagram, coding and other related information.......

  24. please send me the circuit diagram and coding. i am a final year student.

  25. please send me the circuit diagram and coding. i am a final year student.

    my email id is.

  26. please mail me the code and circuit if possible i have selected this project for my final year project..

  27. im interested in this project.could u please send the code and circuit to my email

  28. can any one tell me the ic used in gsm module.
    which can be connected with controller for sending massage.

  29. plzzz send me circuit diagram and report of this project

  30. plz i want report of this project

  31. if you have the report and ppt of gsm based motorcycle security system,can you send to my mail id now i am studying M Tech..for my project i asked.if possible very soon..

  32. plzzz send me circuit diagram and report of this project

  33. could you please email me the circuit of this project..
    here's my email

  34. would you please send me the circuit of this project? this is my email

    thank you
    please email me soon..

  35. Would you please send me all the information about the project , circuit diagram,codes, report..
    I am final year student.
    Thank you..
    Here is my id:

  36. would you please send me the circuit diagram and all information about the project.. this is my email

  37. please mail me the the report

  38. please send this project diagram and code to

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