MAKE subscriber Bryan Zimmer had a cool Bakelite antique telephone and no landline, so he decided to press it into service as a wireless doorbell for his apartment. He writes of the project:

This project combines a battery-operated doorbell, antique phone, Arduino, and subscriber line interface circuit (SLIC) to make a wireless doorbell. Readers are taken through basic phone restoration, creation of a custom doorbell button transmitter, modification of the receiver, workings of the SLIC, and description of the Arduino code. Readers must know how to read a schematic, but soldering and other electronics knowledge are optional. This project will be of interest to those who like to customize their home or office, people who like to repurpose antiques, and those who have been wondering how to ring a phone with an Arduino or other microcontroller.

Doorbell Phone