Programmable number lock system
by Ranjith | November 19th, 2008.Programmable number lock system is a high security number lock system that can be used to lock electronic devices. The present system is very user friendly. This system is a combination of software and hardware at its best. We have used a 8051 microcontroller kit for interfacing our system.
In the present design we can activate or deactivate 9 devices. Each device is locked using a 4 digit code (password). The code can be set as per the user’s desire, hence the name ‘ PROGRAMMABLE ‘. For the device to be activated (unlocked), the user should enter the code that had been entered when the device was locked. In case the user enters the wrong code a silent alarm will be activated.
Introduction to Programmable number lock system:
The system has three units, namely:
- Keyboard unit.
- Display unit.
- Control unit.
The keyboard unit consists of 9 number keys, 1 unlock key and 1 lock key. These are all push button switches. This unit is used to select the desired device and to enter the codes into the system. It is also used to request the system to lock/unlock the selected device.
The display section contains 5 seven segment display. This unit displays the device number and the code entered. This section is detachable. If detached it does not affect the working of the whole system. This unit also contains password reset button and an LED to indicate the error when the device is already locked and user wants to lock the device again. The error indicator also indicates an error when the system is already unlocked and the user tries to unlock the same.
The control unit is the heart of our system. It contains the necessary circuitry for the control of the device .This unit controls 9 devices, which is lock/unlock by selecting it using the keyboard and entering the password. If the code entered to unlock the device is wrong, then a silent alarm is triggered .The keyboard unit and the display unit are connected to this unit.
All these three units are merged together to form the whole system.
Model of Programmable number lock system
Block diagram of Programmable number lock system:
Block diagram of Programmable number lock system:
Working of the system:
When the system is initially installed the reset button is pressed. This key is present in the control unit. This unlocks all the devices. This is to avoid undesired functioning of the system.
To lock a particular device the device number is selected using the keyboard. Once the device is selected the user has to press the lock key present in the keyboard. Now the device waits for the user to enter the the code. The user can enter a 4 digit number using the keyboard as per his desire. Once all the 4 digits are entered the system electronically locks the selected device.
In the same manner to unlock a particular device, the device number is entered using the keyboard. Once the device number is selected the code for the selected device is entered. If the entered code matches the code that had been entered while that particular device was locked then the selected device will be activated (unlocked). If the codes do not match each other a silent alarm will be triggered (a LED placed in the control section. Shown in figure 3).An error indicator (placed in the display section) is provided if any user tries to lock a device which has already been locked or vice versa.
If the user is half way entering the code or has done an error while entering the code and wants to start over all again then a reset button is provided in the display section. By pressing this button the user can start from entering the device number and so on.
The number of devices which the system can control can be increased by addition of a few components in the control unit. More security can be achieved by increasing the number of digits in the code. This can be done by minor changes in the program. The system uses the internal RAM of the 8051 to store the code and hence puts a lower limit to the number of digits in the code and also the number of devices the system can control. Once the system is installed only the display unit and keyboard unit will be accessible to the user. Access to the control unit should be provided only to an official personal since it contains the system reset button.
December 21st, 2008 at 8:11 pm
i am a student of electronics and communication engineering in nepal and we had studied your project and choosed it as our final year project and we dont know how to interface the ckt with the microcontroller kit can you help……
January 5th, 2009 at 11:19 am
i am a student of electronics and communication engineering in karnataka and we had studied your project and choosed it as our final year project and we dont know how to interface the ckt with the microcontroller kit can you help……
January 6th, 2009 at 10:10 am
We are troubled with your incomplete project detail.Please do help us as soos as possible.
January 20th, 2009 at 9:22 am
hi i am doing electronics and communication in madurai.I want u to help me in this hardware project.I need the circuit and the code to do it in using microcontroller
January 20th, 2009 at 2:09 pm
Hi All
Please ask your doubts clearly. Be specific on which section. Here we are just helping students to get Ideas to do their projects.
January 20th, 2009 at 9:48 pm
I need help on the programming section of this project i want to ask can you provide us with the program in c ………
January 21st, 2009 at 4:58 pm
hello.
i am tejas. i have selected this project but i am stuck.
i need to know which 8051 IC is used in this project( like philips,atmel,pic). Also i need the microcontroller kit cicuit diagram with full pcb layout of this whole project.
Please HELP me as fast as possible
January 21st, 2009 at 5:07 pm
MAY I required circuit layout of no. lock
January 21st, 2009 at 5:20 pm
please give me the full details including pcb layout and IC no.s of this project. PLEASE……..
January 28th, 2009 at 9:13 am
sir i am a student of electronics and communication. i have studied and chosen this project as my semester project, i am keenly interested in it. sir i m stuck with the circuit diagram. sir, if u can plz help me wid the circuit diagram of allthree sections along with the code in c ,it will be of great help, as i need it as early as possible
February 2nd, 2009 at 6:35 pm
Hi Sir,
I’m interesting in doing the programmable number lock as a project. I’d be very glad if u send me the entire circuit diagram as early as possible.
Thank you.
February 3rd, 2009 at 9:10 pm
hi,
sir,would u plz give the information about how to interface the micorcontroller kit with the circuit.
February 9th, 2009 at 12:38 pm
We are engaged with the provided details. Hope we’ll come up with the output. Do help for the comlete circuit.
February 13th, 2009 at 10:37 pm
sir i am a student of electronics and communication. i have studied and chosen this project as my semester project, i am keenly interested in it. sir i m stuck with the circuit diagram. sir, if u can plz help me wid the circuit diagram of allthree sections along with the code in c ,it will be of great help, as i need it as early as possible
February 13th, 2009 at 10:41 pm
hi….sir its me 4m electronics & communication dept. I require your help to get sucess in complete my project…I have choosen this project as my final project for semestar 6th..
Awaiting for your help…..
February 17th, 2009 at 2:23 pm
hi……….
i am the student of electronics & telecommunication.
I have chosen this project for my 6th sem.
i want to know the algorithm of this project.
Can you please send me as soon as possible?
awaiting for your reply.
February 19th, 2009 at 1:36 pm
hello sir…
i m an electronics and communication student.
sir i m working on this number lock system project as my final project and i am not clear about its control unit.
sir please tel the full details about the control unit.
sir please reply me as soon as possible.
i have to complete my project till d march..
awaiting for your reply.
February 25th, 2009 at 7:22 pm
hello ranjith, we noticed that at your schematic diagram in the display unit and the picture of the finish product, we noticed that the 555 timer is not included plus another IC In the controller unit, at the circuit diagram, it has 6 ics, but at the picture, it has 10 ics. same with the keypad unit, circuit diagram has 2 ics, in the picture, it has 3. can you please provide me the whole circuit diagram of all units? we are stuck at the moment. reply asap. smsabio@yahoo.com
February 25th, 2009 at 7:23 pm
hello ranjith, we noticed that at your schematic diagram in the display unit and the picture of the finish product, we noticed that the 555 timer is not included plus another IC In the controller unit, at the circuit diagram, it has 6 ics, but at the picture, it has 10 ics. same with the keypad unit, circuit diagram has 2 ics, in the picture, it has 3. can you please provide me the whole circuit diagram of all units? we are stuck at the moment. reply asap.
March 8th, 2009 at 7:59 pm
please send me complete circuitory along with programme code n pcb layout n ic no.s………. as soon as possible
March 14th, 2009 at 8:39 pm
Sir,
i am a final year student from orissa having ece branch.
i am having a problem on the control unit part.the circuit diagram is incomplete and there r more ics present on thegiven block diagram.so if possible, plz send the complete ckt diagram ofthe control section.
March 14th, 2009 at 8:43 pm
In the display unit ,the ic 7496 is used as a 5 bit shift resistor.but this ic is not available in our local market.
so can u tell me an alternate ic for it/???
An early action is required.
i will be grately thankful to u……..
March 14th, 2009 at 8:45 pm
The description of the ics in the control unit is not available also.so how the ics function to meet the target i am not able to understand. so plz giv a detailed function of the control section.
April 2nd, 2009 at 12:46 pm
hello sir…
i am a final year student from ahmedabad having ec-c branch.
i am having a problem on the control unit part.the circuit diagram is incomplete and there r more ics present on thegiven block diagram.
so if possible, plz send the complete ckt diagram ofthe control section.
April 18th, 2009 at 11:05 am
hello……….
I have choosen this project but without any idea please someone help me in this.. I want the coding in c…please help me out as soon as possible…
June 16th, 2009 at 3:22 am
pls sir i am interested in learning how to write my own codes. is there anyway u can help.
July 9th, 2009 at 3:05 am
sir,i am a final year student of electronics n comm.
i am interested in this project but feel the given information is insufficient.So plz send me the codes n complete circuit of the given project.
Plz help me out as soon as possible..!!
July 14th, 2009 at 8:55 am
sir,i am a final year student of electronics n comm.
i am interested in this project but feel the given information is insufficient.So plz send me the codes n complete circuit of the given project.
Plz help me out as soon as possible..!!
August 10th, 2009 at 11:45 pm
Hello. I m diploma ec final year student n i require the information regarding how 2 interface ckt with 8051 kit. Even i require the pcb layout n ckt diagram of 8051 kit.
I need the complete information of this project so plz help me out.
Kindly forward it.
Hope 4 reply as early as possible.
Thank u.
August 11th, 2009 at 12:51 pm
i want this project
August 12th, 2009 at 5:06 pm
hello sir…
ur ideas are very usefull to us !
i really thank u so much!
August 24th, 2009 at 7:29 pm
please send me complete circuitory along with programme code n pcb layout n ic no.s………. as soon as possible
August 27th, 2009 at 6:51 am
sir i am a student of electronics and communication. i have studied and chosen this project as my semester project, i am keenly interested in it. sir i m stuck with the circuit diagram. sir, if u can plz help me wid the circuit diagram of allthree sections along with the code in c ,it will be of great help, as i need it as early as possible
August 27th, 2009 at 6:54 am
hi……….
i am the student of electronics & telecommunication.
i want to know the algorithm of this project.
sir please tel the full details about the control unit.
thanking you…
August 28th, 2009 at 12:15 pm
sir,
please let me know about the circuit diagram,components required and the necessary program in C so that i can design an electronic number lock,which i have taken for my project.
October 10th, 2009 at 10:15 am
IN CONTROL UNIT WE CAN`T SEE PIN NOUMBER OF IC7473
PLEASE UPLOD HI RESOLUTION JPG FILE
October 10th, 2009 at 8:12 pm
i am the student of electronics & communication.
I have chosen this project for my 7th sem.
i want to know the algorithm of this project &some
other information.
Can you please send me as soon as possible?
awaiting for your reply.
October 12th, 2009 at 3:20 pm
hi..
i m interested in your project.. but i want to build the system without using the micro controller as the control system. instead i want to use flip flops… can yu help me with the circuit daigram the system overview??
November 4th, 2009 at 10:56 pm
hello sir…i hav choosen this as a final yr project..
plz cud u mail me..that hw to interface this with 8051..& provide PCB layouts of this..
November 12th, 2009 at 11:18 pm
I am a electronics student and i am very intrested in programmable number lock system
But i don’t have the 8051 kit
So can i change the 8051 by 16f877
And what should i chang in the circuit
November 22nd, 2009 at 6:34 pm
sir,
sir apne isme 8051kit ke bare me likha h uska kya matlab h n vo link kha per h please send me as soon as possible
Thanku
January 1st, 2010 at 1:13 am
Hi Respected Mr. Designer:
I would like to present some of my suggestions regarding this project’s development and simplification, and cost effectiveness.
I will discuss each section step by step
1) The Keypad unit can be greatly simplified by using 4×3 matrix keypad and using its * and # keys for Lock/Unlock it requires just 7 lines to interface. The total Decoding will be done by uController having a suitable algorithm running. This greatly simplifies the Keypad Circuitry by removing all of the encoding chips.
2) The Display Panel is very complex and not much user friendly also has onboard a large no of Latches, Decoders etc it can be greatly simplified by using a single 16×2 or 16×1 LCD Display which can be interfaced in nibblemode to the uController requiring just 6 interface lines saving IO Pins and complexity.
3)Instead of 8051 any other avr family member can be used if more EEPROM is needed to save passwords. But I Think 8051 is suitable.
Keeping in view the above suggesstions the hardware can be centralised around 3 core components i.e uController, LCD, matrix keypad This saves a huge cost, time and makes it robust and much used friendly also development Friendly.
The Design Strategy will be tilted towards Embedded System Design rather Than Digital Logic Design.
January 1st, 2010 at 1:22 am
@ tamim:
=======
Tamim if u know PIC Programming and interfacing you should not have much Problem regarding Hardware Translation. But regarding Software Translation There will be a huge revolution you will have to totally rewrite the software for PIC architecture because 8051 and PIC belong to different families and manufacturers I suggest the Program The Pic in C using mikroC compiler it will save ur time in C rather than in assembly. If you are proficient in assembly then code the PIC in assembly
January 1st, 2010 at 1:36 am
Dear Mr Designer,
Is This was your Final year Project?? or it was your Course Project?
January 6th, 2010 at 8:31 pm
plz send me complete detail of this project.
Thanking You
January 8th, 2010 at 10:37 am
can you send me the project detail shown above to me with some more addition to it
January 14th, 2010 at 1:56 pm
sir i really liked ur idea of dis project ….can u pls send me pcb layout and complete circuit diagram as soon as possible…..
January 15th, 2010 at 5:37 pm
i’m a student doin a project on this topic and i dont quite understand the control unit.i can’t see the pin numbers on the jk flipflops could u pls assist me,i am desparately in need of ur help pls!
January 23rd, 2010 at 4:48 am
sir,
im very intrested in doing this project.so plz send me circuit diagram and code for this project to my mail id.
-krishnaece434@gmail.com
January 23rd, 2010 at 3:55 pm
Am final year tudent of computer engineering,please i need a complete circuit diagram of this project;as soon as possible.thanks for your cooperation.
January 24th, 2010 at 8:52 pm
sir
kindly can you send the circuit diagram and pcb layout of the the project
agugrg@gmail.com
January 24th, 2010 at 8:53 pm
I’m very much interested in doin this as my project
January 28th, 2010 at 6:09 pm
hello sir
i have choosed this as my project
and i have a problem with control unit sir.
so kindly i requested you to send the complete cicuit diagrama and i want to know the algorithm of microcontroller programming. so send the algorithm also
thankink you sir,
January 29th, 2010 at 9:05 pm
gimme more details abu this project………waitin
February 4th, 2010 at 12:34 am
sir please give the source code for programmable number lock system….
February 16th, 2010 at 7:48 pm
Application of programmable lock is to secure electronic device i.e to On & OFF by perticular user,but how to secure any electronic device?What should be connected between lock & device that we are supposed to secure?
February 16th, 2010 at 8:18 pm
Hello Sir,
Firstly i would like to thank you for publishing your work this way. It is helping us in every way. I have a small doubt about this project, I will be highly obiliged if you can help. Sir i have understood the working and all but the problem is that i could not understand the interfacing part. How do we connect the circuit to the electronic device? What is that physical part with the help of which we will be connecting the circuit to the electronic device? Another problem is that to lock the device means what exactly will it do?For example if we take a power supply & we lock it then how will it get locked? What we will observe there & to which part of power supply we will connect the circuit & how? Sir please help me as soon as possible. i will be waiting for your reply. Thank you very much sir. Thank you…
February 24th, 2010 at 11:43 pm
plz tell me the procidure..
March 5th, 2010 at 4:35 pm
I am final year student of Mechatronics engineering.
so kindly i requested you to send the complete circuit diagrama
How do we connect the circuit to the electronic device?What is that physical part with the help of which we will be connecting the circuit to the electronic device? Another problem is that to lock the device means what exactly will it do?For example if we take a power supply & we lock it then how will it get locked? What we will observe there & to which part of power supply we will connect the circuit & how?
would you please send me all these answer thank you.
March 10th, 2010 at 5:07 pm
many thanks !! fairly practical write-up