A.L.FR.E.D/A.L.V.IN

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