Transcript Locknetics Upgrade Project Preliminary Design Review

Locknetics Upgrade Project
Preliminary Design Review
Akin Olugbade
Justin Gilstrap
Lutalo 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 Request
Credentials 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
END
Data Transferred from
Syncing Program to
Upload Program
Verification by Swiping
Vanderbilt Card
Data Sent from CIP
Module to Lock Through
Pin Connection/Contact
Lock Placed in
“Programming Mode”
Data from Upload
Program on Palmtop
Device Sent to CIP
Module Through
Transmission Medium
External Lock Structure
Card Swipe
Green/Red
LEDs (Access
Granted or
Denied)
Key Lock
Numerical
Keypad
Pin
Connection
iButton
Door Knob
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
CIP Module
Lock Circuit
Card
Reader
Keypad Assembly
Battery
CIP Module Components
Type
Number of
Components
2N 3904
2
Resistor
22kΩ
1
Resistor
2.2kΩ
2
Resistor
10kΩ
2
Resistor
120Ω
1
Diode
1N4148
3
Diode
1N914
1
10μF
1
Component
Bipolar Junction
Transistor
Capacitor
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
Fully
fractured
banana pin
Image of
banana pin that
has been worn
out and the
outer casing
has broken
Close up of
fractured
surface
Proposed Solution
Banana
Pins
Smart Cable
•Lower Cost
•Less Stress on Banana Pins
•Can be implemented quickly
•Simply Design as compared to wireless alternative
Lock
Pomonaelectronics.com
Additional Proposed Solutions
• Machine Shop Inserts
– Hinders use of iButton
– Requires modification of over 100 locks
Lock
• Modify Ground Banana Pin
• 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