This document provides details about an ARM-based 4-bit coded locker project with an electric shield. It includes sections on the introduction, block diagram, locking and controlling sections, the necessity of using ARM, circuit diagram, required components, working, advantages, and potential improvements. The locker uses a numeric password and electric shock protection to deter thieves, while alerting security if an incorrect password is entered more than twice. It was designed using an NXP LPC2148 microcontroller, keyboard, relay, and other low-cost components totaling around 4200 INR.

1. PROJECT GUIDE
:M.RAVI
BY:

B.V.S. ALEKHYA (10521A04A1)

SHUBHAM KUMAR (10521A0487)

ROHIT SOURABH (10521A0484)

V.BHANU CHAITANYA(10521A04A4)

D.V.Y.V. SUBBA RAO (11525A0403)
ARM BASED 4-BIT CODED LOCKER
WITH ELECTRIC SHIELD

2. INTRODUCTION
BLOCK DIAGRAM
SECTIONS
LOCKING SECTION
CONTROLLING SECTION
NECESSITY TO USE ARM
CIRCUIT DIAGRAM
COMPONENTS REQUIRED
WORKING
ADVANTAGES INVOLVED IN THE PROJECT
IMPROVEMENTS THAT CAN BE MADE
CONTENTS

3. Disadvantage of conventional mechanical lockers- high cost and
comparatively lower security
It is an electronic code lock based on NXP LPC2148 microcontroller
Alphanumeric password is needed to open the locker
If password is wrong a buzzer blows to alert security within reach
The burglar may be subjected to shock if he tries to touch the locker
INTRODUCTION

4. BLOCK DIAGRAM

5. LOCKING SECTION
TECHNOLOGY USED:
We used actuating technology for the locking section
We used motor with a nut and bolt and designed an
actuator
This actuator will be used for auto closing and opening of
locker

6. SECTIONS
LOCKING SECTION
CONTROLLING SECTION

7. LOCKER
we connected a nut and bolt to a geared
motor and designed the locker unit

8. DPDT SWITCH
we used a dpdt toggle switch for opening
and closing of the locker

9. ELECTRIC SHIELD
we placed the conductor around the
walls of locker
this conductor is allowed free flow of
electric supply and it is indicated by red color led
circuit

10.  LPC2148 is based on 32 bit ARM7TDMI(-S) developed by ARM
Holdings
 3-stage pipeline
 Keeps its instructions and data in the same memory system
 High speed on-chip flash memory of 512 KB
 Embedded ICE hardware, give on-chip breakpoint and watchpoint
support
 High performance and very low power consumption
 Two instruction sets:
 1. Standard 32-bit ARM instruction set.
 2. 16-bit THUMB instruction set.
 On-chip static RAM (SRAM)
 Enhanced Multiplier, 64-bit result
CONTROLLING
SECTION

11. Why ARM?

LOW COST

LOW POWER
REQUIREMENTS

LOW POWER DISSIPATION

MULTIPLE
FUNCTIONALITIES

BETTER RAM AND ROM
CAPABILITIES

RISC-BASED PROCESSOR

12. CIRCUIT DIAGRAM

13. Blueboard equipped with NXP LPC2148
microcontroller
QWERTY keyboard
Relay
Electronic locker
Speakers
COMPONENTS REQUIRED

14. NGX Blue Board

15. KEYBOARD CONNECTIVITY WITH THE
BLUEBOARD

16. WORKING OF THE WHOLE SYSTEM
When the user enters a password using the Keyboard attached to the
Blueboard, then the logic built in the Embedded C program checks it
with the pre-stored password.
1. If both the passwords match, then the LCD displays the
“ Correct Password” message and after 2 seconds instructs
the user to toggle up/down the Red Switch connected to the
relay by displaying a message “Toggle Red Switch”.
2. If the password entered by the user is wrong, then the
LCD will display the message as “Password Wrong, Try Again”
by alarming with a buzzer attached to the Blueboard and
gives the user 2 more chances of entering the correct
password. If the user still fails to type the correct password
in their 3rd attempt,then the LCD displays the message as
“Security Alarm” and the microcontroller will send a Security
alarm signal by generating an audio signal for 15 seconds
which will be played on the speaker.

17. DISPLAY ON ENTERING CORRECT
PASSWORD

18. DISPLAY ON ENTERING WRONG PASSWORD MORE THAN THRICE

19. ADVANTAGES INVOLVED IN THE PROJECT
• Highly Secure due to the presence of multilevel security with electric shield
• The development board requires just 3.3 V of power supply and hence
power consumption and dissipation are very low.
• Security alarm with the help of DAC is possible, thus alerting the
security personnel if any unauthorized repeated access is made more
than thrice.
• Inability for any unauthorized user to access the locker due to the
presence of all-time electric shock.
• One-minute blocking of the whole system if any unauthorized access
is made more than thrice.
• Made on a low budget of Rs. 4200 which is quite low as compared to
the similar type of system available in the market

20. IMPROVEMENTS THAT CAN BE MADE
•
GSM-GPS INTERFACE CAN BE INCORPORATED
•
A BETTER USER INTERFACE CAN BE PROVIDED
THROUGH HYPER-TERMINAL USING RS-232
COMMUNICATION AT THE COST OF
INCREASED BUDGET
•
A PERIODIC ALARM CAN BE CONFIGURED FOR
MORE ENHANCED SECURITY USING THE RTC
MODULE PRESENT IN THE BLUEBOARD

21. THANK YOU