The goal of this project was to design an inexpensive rfid door lock which could be opened via smart phone, and have all activity logged w/o utilizing any 3rd party servers or cloud hosting.
Quotes from 3rd party companies came in @ ~$3000/door.
The total hardware cost of this project is under $100/door.
I used a raspberry pi, magnetic door lock, rc522 rfid reader, and 5 volt relay to design this project.
