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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