Connect through a gsm gprs communications module.
Wifi door lock diy.
Add a local microsd file to backup the information in case of wireless unavailability.
Connect to a dbms for ease control and maintenance of multiple locks and users.
Connect a real solenoid lock to the relay and update the instructables with a working video.
Wi fi enabled smart locks can be controlled over a wi fi network.
Collecting the items required step 2.