1. Networked Door Locking System
Kevin Lopez and Benjamin Thompson

2. Overview Users can lock and unlock their door using a web interface
Uses:
Check if the door is locked when the user is away
Lock the door remotely if the user forgets to lock it
Unlock the door if the user forgets his key
Unlock the door remotely for another person

3. Components Raspberry Pi Arduino microcontroller Servomotor
USB Bluetooth module
Arduino microcontroller
Serial Bluetooth module
Servomotor
Simulates lock on door

4. Architecture Raspberry Pi Website made with PHP running on Apache2
Authentication using a hashed password
Communicates over Bluetooth with the Arduino
Sends commands using PHP-serial module
Receives information on whether door is locked or unlocked

5. Architecture
Arduino
Receives signals from Raspberry Pi over serial Bluetooth module
Turns servomotor to lock or unlock door upon request from Raspberry Pi
Then sends signal back to Raspberry Pi indicating that status of the lock

6. Web Interface User must enter password for every command
User can check the status of the door, lock it, unlock it, or change the password
User can access website either from computer or from mobile device

7. Pi-Arduino Interface Bluetooth
Allows Raspberry Pi to operate near power and Internet access
Allows Arduino to operate next to the door, where Internet or power may not be available
Raspberry Pi pairs with Arduino using rfcomm utility, which creates a serial channel over Bluetooth
This channel can then be used by the php-serial module to send and receive commands

8. Usage Internet Ethernet or WiFi Raspberry Pi Arduino Servo Bluetooth
PWM