locknetics upgrade project preliminary design review akin olugbade justin gilstrap lutalo webb
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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
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