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.
(4 votes, average: 3 out of 5)
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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.