Thanks to everyone who supported this project and voted for it in the Arduino Challenge! I was awarded second prize and hope to participate in more Arduino contests in the near future.
This tutorial will explain a simple way to make a password protected bluetooth door lock using your Arduino, which can be unlocked by sending a four digit pin from your Android phone! The hardware setup is quite simple, and the programming side of it is a bit tricky, but should be no problem for any Arduino ameuture.
Step 1: Parts Needed
1. Arduino (I am using the Duemilanove)
2. Electric Door Strike
3. Bluetooth Module ($9.99)
4. Power Supply (Required voltage and amperage differs among different door strikes/locks)
5. TIP120 Transistor
6. 1N4001 Diode
7. Hookup Wire
8. Solderless Breadboard
9. An Android phone (optional, considering that there are lots of devices you could use to send serial data to our bluetooth modem including Iphones, computers, and other Bluetooth devices)