Security door lock system

College of Engineering and Science

Digital Combination Lock System

ELEN 408

Spring 2016

Names:

Dinuka Kuruppuarachchi

Ruzova Dahal

Jayakody Arachchige

Sponsor Details: The Vacant Property Specialist,

Jake Switzer (District Sale Manager)

800-918-9100

[email protected]

email: www.vps360.com

05/16/2016

http://www.vps360.com/

http://www.vps360.com/

Senior Design Spring Report

16th May 2016 ELEN 408 Electrical Engineering

Design I

2 College of Engineering and Science

Introduction to the Project

This senior design project is carried out for our sponsor company Vacant Property

Security, LLC (VPS) which was founded in 1993. VPS is a trusted leader in securing,

maintaining, and managing vacant properties across a wide range of residential and commercial

sectors. They have locations in Los Angeles, CA, Atlanta, GA, Miami, FL, Chicago, IL, Detroit,

MI, Cleveland, OH, Philadelphia, PA, Newark, NJ, and Dallas, TX. VPS allows customers to

protect their vacant properties against unauthorized access and property decay.

The company’s main goal is to ensure that properties retain their value and provide

customers peace of mind in knowing that their vacant properties are safe and secure. VPS used to

order security doors from a company in UK, which recently stopped manufacturing them. Hence,

our objective was to solve their problem by building a replacement door. The intended purpose

of this project is to build a digital combination lock system that will allow to unlock the door

which will be built by the Mechanical Engineering senior design team for VPS. The door is

made of steel and it features a keypad where codes can be entered to gain access to the property

while providing additional security from intruders. The focus of our Electrical Engineering

Design team was to design and rebuild a door lock system, where we can enter codes that will

interact with the main controller which in turn will interact with the locking mechanism and

allow us to unlock the door. Finally, this digital combination control lock system is mounted on

the door built by the Mechanical Engineering Design team.

Moreover, this electronic lock system works based on combination codes and has a

buzzer attached to it which will further facilitate the customers. These doors are expected to

provide security in the building.

Our Electrical Engineering project team consists of Dinuka Kuruppu, Ruzova Dahal, and

Shakya Jayakody. We were supported by our advisor Dr. Davis Harbour and Dr.Paul Hummel of

Louisiana Tech University in Ruston, Louisiana and also by Mr. Chad Mosley of Vacant

Property Security, LLC in Dallas, Texas. Besides, we planned and worked in collaboration with

the Mechanical Engineering Team throughout the year to successfully complete the project.

according to requirement.



Design I


Customer Requirements

Functional Performance:

- Improved power supply. The electronic release seems to use much more power in the cold

weather. We have most of our dead battery calls in the winter

- Key & Code all-in-one door. The door is designed such that the servo motor is also activated

using a key

- Override key – If the battery dies key will open the door. Battery needs to be replaced

occasionally

- Make door lever recessed. Easier for stacking and transport.

- Recessed pull handle – some folks have issues opening the door using the lever.

- Less force to pull down the open/close handle

- Improved button color longevity

- Login database with all logging details including date, time and password type

Operating Environment

- These doors will be placed on places where security access are required

- The doors are expected to be placed in residential temperatures of about 50-100 F

- Minimal dust

- Able to be operated multiple times a day

Economic

- Should have economic life of more than 5 years

- Should not require disassembly other than changing batteries

- Should be able to safely operate

Maintenance, repair, retirement

- Technician will be needed to install

- Battery supplied for power will be easy to remove or replace and instruction to do so will be

provided

- Contact the local agent during the any faults

Reliability, robustness

- No failure should occur during economic life

- Besides replacing the battery occasionally, no parts should occur



Design I


Safety

- Use of proper tools and safety method to install the system will prevent any injuries

- This door can be safely operated multiple times per day

- Will not catch fire during normal use

Pollution

- Will not create any pollutions

- Will not create noise greater than 40 dB.

Ease of Use

- Can be operated multiple times per day

- Door will be unlocked once the correct code has been entered

- Entering incorrect code for three times will activate the buzzer for security purpose

Human Factors

- No large force required to unlock the door

- Correct code will unlock the door instantly

- Battery can be replaced or removed easily by the operator by following the instruction

provided

- None of the parts are slippery

- Can be accessed by people in wheelchair too

Appearance

- The exterior of the door will be made of steel

- Only the keypad, LED and fingerprint scanner will be seen and accessed from the outside

of the door.

- The main controller, batteries and wires are attached to a board that is mounted on the

door from the interior

- Surface finish will be smooth and easy to clean

- There will not be any sharp metals or edges



Design I


Company Requirements:

Marketing

- The retail price of the finished door should be less than $4500

Manufacturing

- The final demonstration and presentation was done on May 6, 2016

- Components used in the door are readily available to buy within US

- The components are chosen in the basis of budget and functionality

Financial

- The budget for the entire project is $4500 of which Electrical Engineering Design team

will be using approximately $75

Other

- Production prototype was shown to the Senior Design Professors Dr. Harbour and Dr.

Hummel before the final testing



Design I


Project Flow Chart

Figure: Project Flow Chart



Design I


The above flow chart demonstrated the overall working process of the project. We started the

project by the making a timeline in Gantt Chart. We used AT Mega 2560 as our main

microcontroller and Atmel Studio 7 to program it using C programming language. First, we used

a 4 by 4 matrix keypad to enter the password for easiness and later replaced it by 2 by 3 matrix

color coded keypad according to company requirements. After programming for the passwords,

Real Time Clock was implemented and SD card and Buzzer were added.

Technical Details

Block Diagram

Figure: Block Diagram showing inputs and outputs of the system

We used AT Mega 2560 as our main microcontroller and Atmel Studio 7 to program it. The

inputs of the system are sensor, 5 color coded keypad and real time clock. Outputs/results are

obtained in various forms through rotating of servo motor, SD card reader to store and record

time, and buzzer to make alarms.



Design I


Figure: Layout of System



Design I


Working Mechanism of servo

When we enter correct set of password, the servo will rotate 17 clockwise to unlock the door.

Similarly, when we lock the door, the servo will rotate 17 anti-clockwise.

Figure: Working mechanism of servo



Design I


Mechanism of the controller with LCD

Figure: Layout of system consisting of LCD

Initially and LCD was also attached to the system for easiness and to be able to debug. However,

it was later removed according to company requirements.



Design I


Microcontroller Programming Flowchart



Design I


Figure: Flowchart showing microcontroller working mechanism

Main Controller

The Arduino Mega is a microcontroller board based on the ATmega2560 using AVR

architecture. It consists of 14 PWM output pins,16 analog inputs, 4 UARTs pins total 54 digital

input/output pins. It runs with a 16 MHz crystal oscillator. This board can operate on an external

supply of 6 to 20 volts. For the stability the recommended range of the supply is 7 to 12 volts.



Design I


Figure: Arduino Mega

Specifications

Microcontroller - ATmega2560

Operating Voltage - 5V

Input Voltage (recommended)- - 7-12V

Input Voltage (limits) - 6-20V

Digital I/O Pins - 54

Analog Input Pins - 16

DC Current per I/O Pin - 40 mA

DC Current for 3.3V Pin - 50 mA

Flash Memory - 256 KB of which 8 KB used by bootloader

SRAM - 8 KB

EEPROM - 4 KB

Clock Speed - 16 MHz

Figure: Ports on Main Controller



Design I


Five Color Coded Keypad

The flow chart below shows the working mechanism of 5 buttons used to enter the password.

Figure: Working Mechanism of Keypad



Design I


Keypad Design

Requirements

We were required to design and built five button color coded keypad to enter the password.

However, to be able to reset the password without creating conflict of command, we decided to

add a master button.

Process

To add six buttons, we decided to do the PCB design to make the schematic and layout for the

keypad. We used CADSoft Eagle PCB Design Software to do the PCB layout for the keypad.

The schematic was based on 2 by 3 matrix layout design as seen in figure.. We ordered the push

buttons from Digi key and based on the measurements from the data sheet, the schematic was

made using the software. Next, the layout was made using the same software as seen in figure…

Figure: 2 by 3 matrix design Figure: PCB Layout

After making the layout, it was printed on a photo paper using laser printer. By applying heat for

30 minutes, the mirror image of the layout was printed on the copper clad board. The board was

then dissolved into Ferric Chloride solution for 30-40 minutes to fabricate the copper board.



Design I


Finally, the PCB layout was ready. Holed were drilled using hand drills. The push buttons were

inserted and were soldered from behind the board. Two wires from the rows and three wires

from the columns of 2 by 3 matrix buttons were soldered and connected to the main controller.

The keypad was then programmed by coding on the Atmel Studio 7.

The process can be seen in pictures below:

Figure: Keypad Design Process

Servo



Design I


DSS-M15 is a heavy-duty gear standard servo with 180𝑜wide angle. high torque power

improved stability and durability.

Figure: Keypad Design Process

Features:

-Operating Voltage range 4.8- 7.2 volts

-Operating speed: 0.18 sec/60𝑜

-Quiescent current: 80mA

-Stall Torque

-Control signal RC PWM

Buzzer and Bumper switch

A buzzer will notify if the password incorrect/correct and when the door is unlocked/locked.

Bumper switch will detect whether door is closed or open, signal will deliver to the

microcontroller to process.



Design I


Figure: Keypad Design Process Figure: Keypad Design Process

SD Card reader and Real Time Clock

For our senior design project, the company also required Password tracking device to check who

has enter 5 different passwords on relevant time. To accomplish this task, we include a Real

Time Clock, SD Card Reader and a SD Card.

Figure: SD Card Reader Figure: Real Time clock DS3231

Real Time Clock

Real Time Clock will use to store time. Due to the in build battery, data won’t be loss even when

there is a power outage. RTC and the microcontroller communicate in 𝐼2𝐶, with in build unique

hex address. RTC maintains seconds, minutes, hours, days, date, month, and year information.

This module also can read the temperature.



Design I


Features:

-High accurate RTC (±2𝑝𝑝𝑚 from0𝑜𝐶 − 40𝑜𝐶)

-𝐼2𝐶Communication methodhas most microcontrollers

-Battery-Backup input for continuous timekeeping

-Standard 3.3V

- Digital Temp sensor ±3.5𝑝𝑝𝑚accuracy

-Two time-of day alarm

Block Diagram:

𝑰𝟐𝑪communication method can communicate 100 devices individually, since each device has

unique hex address using bus network. DS3231 also has a unique hex address stored in 𝑰𝟐𝑪

Interface And Address Register Decode. Clock And Calendar Registers Store the time and date.

Once the Handshake between microcontroller and the Real Time Clock happen Clock And



Design I


Calendar Registers will send the data to microcontroller using 7 Bytes User Buffer for use full

data.

SD Card Reader

SD Card and SD Card reader will be use to store a database, to check who has open the door

using 5 different passwords. SD card and the microcontroller communicate using SPI

communication method.

Features:

-SDHC Card Reader

-ISP Communication method has most microcontroller

-SanDisk 4GB SDHC Card

-Standard 5V/3.3V

-Size: 5cm x 3.1cm

Cost

ATmega2560 Microcontroller $44

Keypad Build $30

Real Time Clock $2

SD Card $8

SD Card Reader $1

Some of the constraints that applies to our design are as follows:

Economic Constraints

- Economic constraints this particular constraint do not apply

Environmental Constraints

- Environmental constraints this particular constraint do not apply

Political Constraints

$75



Design I


- Political constraints do not apply

Ethical Constraints

- Ethical constraints constraints do not apply

Health and Safety Constraints

- Health and Safety constraints does not apply

Manufacturability Constraints

- Mechanical and Electrical engineering knowledge will be required apply to manufacture

or modify the system

- PCB design for color coded keypad might have to be done

Sustainability Constraints

- Sustainability Constraints do not apply

Conclusion

We have laid out the company requirements, prepared schedule, built flowcharts, discussed

working mechanism and ordered our main controller. We conducted weekly team meetings and

worked together to design and build the locking mechanism for the door. The first, second and

third project demonstration was done on December 5, 2015, March 16, 2016 and April 28

respectively. The final presentation of the project was done on May 6, 2016.

Security door lock system

Documents

Transcript of Security door lock system