This document describes a digital code lock project created by a group of students using a PIC16F627 microcontroller. The objectives of the project were to design a keyless door entry using an electronic digital lock code to help users access areas without a physical key. The project implemented the necessary hardware circuits and programmed the microcontroller to accept a code and unlock the door. Developing this digital code lock provided an opportunity for the students to learn about microcontroller interfacing and programming.

1. MICROPROCESSOR &
MICROCONTROLLER
(BEX32003)
DIGITAL CODE LOCK
GROUP MEMBER:
MOHD TARMIZI BIN ISAHAK (CE 100163)
MUHAMMAD FIKRI BIN ISMAIL (CE 100148)
RAJA FAIRUZ NABILA BT RAJA MUDZAFAR SHAH (CE100202)
ZAIRUL AFFANDI BIN ABDUL KAMAR (CE
100125)
NUR ADILAH BINTI SHAMSUDDIN (CE 100165)
INSTRUCTORS:
DR MOHD SHAMIAN BIN ZAINAL
DATE:
23 DECEMBER 2011

2. INTRODUCTION

3. Digital Code Lock using PIC16F627 is a basic control system
with an ability that allows the rightful user to deploy platform to
any property that require simple password protection.
This code can be changed by the user. This circuit is
eminently suitable as a digital code lock.
Digital code lock is a type of lock in which a sequence
numbers is used to open the lock.
This type of lock use numerical code for authentication where
the correct code must be entered in order for the lock to
deactivate.
The lock can be use with an outdoor gate or a normal door.
The functionality of this lock implemented in software.

4. When the correct code is entered it will open the
door. The significant of this project is first
eliminating the need for a key.
When there is no key, it will allow each person who
lives at a residence to enter home without a key.
The lost and forgotten keys are problems of the
past.
Hence using the digital code lock it will reduce the
risk and liability of keys falling into wrong hands as
a result being stolen or duplicate.
The digital code lock, changing access code is
more cost effective then the process of changing
all keyed lock.

5. PROBLEM
STATEMENT

6. There are great varieties of
digital code locks. Generally
speaking, they can be classified
into scores of type, such as
electronic lock, fingerprint lock,
card lock biological lock, etc.
Among them the most This kind of lock can avoiding
practical and the most the problems caused by the
popularized one come to copying of keys.
digital code lock.
It is because the keys people carry
have become burden most of the
On the premise that it’s safety is time, but by contrast people need
high, it’s another feature without only to remember a set of codes for
key is getting more and more electronics locks and don’t have to
favour of people. carry any key, thus freeing
themselves from worries.

7. OBJECTIVES

8. To help users
and give them
favour to go
anywhere.
To avoid any To design a
crimes keyless door
especially entry by using
stealing electronic digital
activities. lock code.
The
objectives of
our project
are listed as
above:

9. SCOPE
OF
PROJECT

10. Projects do not need
complex and not too short
according to the study
and it should relate to the
study basic idea and
operation of Digital Code
Lock.
The project identifies the
The project produced must
suitable type of PIC
involve the use of
microcontroller for the project
components and circuits
to developed interfacing link
have been studied and
between hardware circuit and
understood.
software programming.
The project displayed the
code and signal, when
success LCD screen
display ‘code accepted’.

11. PROJECT
IMPLEMENTATION

12.  Circuit Design and Drawing
- Research the circuit
- Study the component and material
- Simulate the circuit
- Construct the circuit

13.  Programming the PIC
- Select the language to use for microcontroller
- Write the program code
- Debug and check the error
- Compile the code

14.  Board Construction
- Drawing the circuit (Proteus Software)

15. - Wiring circuit (protoboard)

16. BLOCK DIAGRAM
 Electronic Code Lock has both hardware and software
parts. Figure below shows block diagram of the project:

17. FLOW CHART

18. CONCLUSION

19. When we completed this
project, we had learned and
understand the process of
constructing the Digital Code
Lock which contained
This digital code lock is
hardware and software
therefore particularly useful
development. We also know
in applications such as hotel
and understand the
room door locks, residential
microcontroller PIC and how
housing and even office
to implement it on my
buildings.
project.
We feel that this digital code
lock is very marketable Designing code lock very
because it is easy to use, interesting for us where we
comparatively inexpensive can get involve in
due to low power programming environment
consumption and highly seriously.
reliable.
The biggest hurdle we had to Our digital code lock
overcome with this project was performed as expected. We
interfacing the microcontroller were able to implement all the
with the hardware functions specified in our
components. proposal.

20. RECOMMENDATION

21. Digital code lock is
useful
in society. Therefore, it
should be expanded so
that the community can
use wherever they
are as well as using
a code lock on
the vehicle or the like.
There are few
suggestions appear
after completing
several stages of
this project based
on some problems
that we find:
Digital code lock may
For the sake of the
need to limit the number
future, digital code
of password entry
lock should be added
attempts to reduce the
with siren when have a
risk for broken-
burglary password.
in password.

22. REFERENCES
[1] Tim Wilmshurst, Designing Embedded Systems with PIC
Microcontrollers, 2nd ed. United Kingdom 1998.
[2] Harprit Singh Sandhu, Making PIC Microcontroller Instruments &
Controllers, New York, 1987.
[3] Milan Verle mikroElektronika, PIC Microcontrollers Programming in C,
1st ed, United Kingdom, 2009.
[4] Myke Predko, Programming and Customizing the PIC Microcontroller,
3rd ed, 2005.
[5] Di Jasio, Wilmshurst, Ibrahim, Morton, Bates, J. Smith, D.W. Smith, and
Hellebuyck, PIC Microcontrollers Know It All, United Kingdom, 1987.