Adaptive Biometric Smart Door Lock System with Time-Bound Access Using GSM Module

As more households employ domestic help, the houses need security systems, especially those which are efficient but user friendly. Previous biometric systems which use fingerprint scan offer high level of security but most of them cannot adapt to the different time schedules of employees like maids, without compromising the security. This paper introduces a new Smart Door Lock System that combines fingerprint authentication with remote homeowner controls. Homeowners can schedule the time when the maids can enter, hence providing added security. At these times, maids are given free access, and the homeowner is notified. If it is attempted outside these times, the system requires a onetime password (OTP) sent by the system. Additionally, the system uses an infrared (IR) sensor that activates the fingerprint scanner only when someone is at the door, which significantly improves power efficiency by reducing idle energy consumption. System effectively manages access based on predetermined schedules while enhancing both security and energy efficiency in residential settings.