A.L.V.IN (Alvin Lets Visitors IN) is a revised branch of the alfred
board, designed for internal doors.

Features:

-   raspberry pi shield
-   atmega328
-   battery backup
-   power a maglock or similar
-   weigand rfid reader
-   button for doorbell
-   button for opening door internally
-   detection of open / closed status of door

[Category:Hackspace projects](Category:Hackspace_projects "wikilink")