1.0 Introduction
A digital door code lock system using computer interface makes use of “code lock as a digital, electrical and mechanical device. It is designed for low usage application such as staff only area, information technology (IT) rooms, office doors, toilets, bank doors and store cupboards.
The unit is fully reversible, simple to fit stays locked until correct code is entered, code easily changed, over 8000 codes to choose from suitable for entering use and doors up to 55mm thick.
It could be used for locking the door, the bike, the fence and so on. It is a simple and secure method of locking without having to resort to the use of keys.
The digital door is a practical and code locking solution, ideal for commercial or residential premises where only a few internal doors need securing. It removes the need for keys, taking away the hassle and cost of copying or replacing lost ones.
Doors fitted with a co-door are opened by typing in a code, minimizing the risk of unwanted visitors gaining access to a restricted area, without imprinting the daily activities of tenants or staff.
This digital door incorporates an electronic code cock, a mechanical locking device and a power unit in the same housing and alternations to the door frame.
The door slides itself when the correct code is entered (2,4,6,8) and closes when a switch is pressed OFF. It provides user with a secure, convenient and cost effective way of locking doors.
The target or major aim of the digitally controlled door is to increase reliability and confidence limits by offering access to certified persons belonging to the set having the knowledge of the codes or permitted by the computerized interface.
It is therefore worthy of consideration as it is consistent with recent global realities where recession and global melt down has increased crime rates and hence the more need for security consciousness.
Constituent Circuits
The digitally coded door can be organized into:
- The flip flop section.
- Mono stable section
- Manual close section
- Computer interface section.
Basic Observed Configuration
There exist certain variations which is a product of the different combinations and the relationship between one of these segments and the other. Some of the variations can be noted as follows:
- A combination which is opened by a single button push and automatically closed after a specified time lag with default buttons e.g. banks.
- A combination of single push button to open and a single push button to close.
- A combination of multiple push buttons to open and multiple push buttons to close.
- A combination of a multiple push button to open and a single push button to close.
All of the above variations can be programmed with a computer Interface which makes this particular project unique in nature.
1.1 Significance of the Study
The significance is inherent in the importance of security. After life is the major gift from the divine or supernatural men, the most primary obligation of man as his own role in appreciation of the gift of the divine, is security be it of life or extended to property.
Any effort therefore to ensure security is the compulsory role of man to appreciate the divine hence the relevance of this project: digitally coded door with computer interface.
This project targets to eliminate all or most of the problems associated with the use of manually operated doors and improves the confidence and convenience of the user. It equally targets to reduce all factors leading to insecurity of lives and properties. Thus the significance of this project is;
- To provide security in such a way that only authorized persons with the knowledge of the code can have entry access.
- To reduce labour as it eliminates the option of a member of the closed set waiting for another who might stand on the door and open close doors.
- It is more convenience to the user as unpermitted persons don't interrupt his movement.
- It does not require a high voltage to drive it and is as such easily handled due to its less harmful nature.
- This project incorporates a logic system that switches off the rotating motor and prevents it from wear and tear which arises when it runs permanently.
- The user has the liberty of taking his/her time to perform operations or use the access until the reverse button is pressed unlike the banks where after time lag the door shuts.
Disadvantages of This Project
- A visitor coming to the house must call before having access to the door.
- If used on a cupboard, where documents are kept, when the person with the code dies will lead to breaking the cupboard.
- When drunk and code forgotten, you can never have access to it.
- When there is power failure access to the door will be restricted.
1.2 Scope of Study
1. The scope of this project covers the construction of a digitally coded door with computer interface.
2. There is no emphasis on any display system hence no display system is involved in this project.
3. The voltage rating for each component did not exceed the stipulated values in order to avoid damaging the circuit.
4. The scope therefore covers the above mentioned points coupled with the understanding of the working principles of the various four (4) basic observed configurations.
5. It strives to understand the working principles of the industrial components and their characteristics combinational activities applied to the project.
1.3 Definition of Terms
The term digital coded door with computer interface could be simplified as the use of codes and computer to control the opening and closing processes of the door system of offices, homes, gates etc.
The operation of input codes is controlled by four (4) different flip flop integrated circuits that compares or evaluates the different four (4) input codes for opening the door system. The integrated circuit value is CD4013 which is used as bi stable multi vibrator.
The timing of the circuit is the period of motor rotation at a particular time is controlled by the mono stable section endorsed by the NE555 integrated circuits and determined by the equation T = 1+RC.
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