Alfons

...a telegram bot and hardware to control old intercoms

The board and software were developed under the following goals:

• Play sounds thru the intercom
• Open the door remotly using an access-token or a telegram-acount whitelist
• Control the hallway's lights
• Detect and answer 'rings'

3D-render

hooked up to RPIZ

Schematic:

Board (without ground pane)