The system is based on:
- Adafruit Feather (specific model to be determined)
- Adafruit Music Maker with Amp FeatherWing (https://www.adafruit.com/product/3436)
- Patrick Van Oosterwijck's PoE FeatherWing (https://hackaday.io/project/168356-poe-featherwing)
One of the units will be the "master". The doorbell buttons will be connected to GPIO pins on this unit. When a button is pressed, the master unit will send out a multicast UDP packet instructing the other (annunciator), units to play a particular sound file and will then play the same sound file itself.