This was my first attempt at proving that the BDB-5000 Bluetooth Doorbell project could be done. This is a simple setup on a breadboard using a Bluetooth module, a large battery pack, an AVR microcontroller loaded with custom code, and a custom Android app loaded on the mobile phone (a Droid 1).
Something a little more portable will be coming soon.
And here is a video of the BDB-5000 Bluetooth Doorbell version 0.0.1 in action. The alert can be heard and it can be seen in the outlined area on the phone’s screen.