Locknetics Upgrade ProjectPreliminary Design Review

Akin OlugbadeJustin GilstrapLutalo Webb

Overview of Locknetics• Used in the Vanderbilt

Engineering school to ensure secure access to facilities in Featheringill and Jacobs Hall

• Features:– Records 1000 door events– Low power, runs off AA

batteries– 6/12 Button Keypad– Emergency access key– Based on heavy duty Schlage

Lock

Operational Concept

Change RequestCredentials Obtained from Vanderbilt Card Through Card Reader

Data Transferred to Host Computer

Data Uploaded to Database Program on

Host Computer

Data Transferred from Host Computer to

Palmtop Device Through Transmission Medium

Data Uploaded to Syncing Program on

Palmtop Device

Data Transferred from Syncing Program to

Upload Program

Data from Upload Program on Palmtop Device Sent to CIP

Module Through Transmission Medium

Lock Placed in “Programming Mode”

Data Sent from CIP Module to Lock Through Pin Connection/Contact

Verification by Swiping Vanderbilt Card

END

External Lock Structure

Card Swipe Key Lock

Green/Red LEDs (Access Granted or Denied)

Numerical Keypad

Pin Connection

Door Knob

iButton

Internal Lock Structure

- Card swipe connects to the keypad

- Keypad circuit connects to lock circuit inside back of lock

Internal Lock Structure (cont.)

- Located inside back capsule of lock

- Source of battery power

- Lock circuit-Multilayered-Sends out signal to unlock/lock door- LED lights respond to signal received

Lock Block Diagram

CardReader

Keypad Assembly

CIP Module

CIP Module Components

Component Type

Number of Component

sBipolar Junction Transistor 2N 3904 2

Resistor 22kΩ 1

Resistor 2.2kΩ 2

Resistor 10kΩ 2

Resistor 120Ω 1

Diode 1N4148 3

Diode 1N914 1

Capacitor 10μF 1

Hardware Requirements• Host Computer

– Shall process changes and stores database of access rules– Shall have standard keyboard, monitor, etc.

• Card Reader– Shall acquire user information from cards for use to update database on host

computer• Palmtop Device

– Shall store updated database while going from lock to lock• Transmission Medium from Host Computer to Palmtop

– Shall send updated card access rules from the Host Computer to the Palmtop Device

• Lock Interfacing Module– Shall accept new data and places it in the lock

• Transmission Medium from Palmtop Device to Lock Interfacing Module– Shall send the updated card access rules from the Palmtop Device to the Lock

Interfacing Module

Software Requirements• Operating System for Host Computer

– Shall enable control of the host computer• Database Program

– Shall store and organize the card access rule for each lock– Shall keep an inventory of all the users that have access to locks

• Palmtop Synchronization Software– Shall synchronize the database on the Palmtop Device with the database on

the Host Computer– Shall package and send data to the IO Ports on the computer

• Palmtop Operating System– Shall enable control of the Palmtop Device

• Palmtop Database Software– Shall organize and store the card access rules on the palmtop device

• Lock Synchronization Software– Shall package and send information to IO ports of the Palmtop device

intended for the lock

Locknetics Problem

• Banana Plugs unable to withstand stress of CIP

module and cord

• Physical connection problems between CIP and lock

• Time consumption of walking to each door to

program locks

Fracture Analysis of Banana Pins

Image of banana pin that has not been previously

used

Image of banana pin that has been worn out and the outer casing has broken

Fully fractured banana pin

Close up of fractured surface

Lock

Proposed SolutionPa

lmto

p De

vice

CIP

Mod

ule

Banana Pins

Smart Cable

•Lower Cost•Less Stress on Banana Pins•Can be implemented quickly•Simply Design as compared to wireless alternative

Pomonaelectronics.com

Additional Proposed Solutions

• Machine Shop Inserts– Hinders use of iButton– Requires modification of over 100 locks

• Modify Ground Banana Pin

Lock

• Sponsor’s Proposed Solution- Wireless Data Transmission (Bluetooth or Infrared)

Circuit Schematic and Simulation• Output of CIP module uses

5V – 0V voltage levels• These Voltage Levels are

common among digital electronics

• Close to 5V when data is being sent to lock.

• Close to 0V when not data being sent to lock

• As predicted by simulation, voltage levels were between 0V and 5V