GSM Based Door Lock Security Controlled System with Microcontroller

This paper expresses design of a microcontroller-based GSM-based door lock security control system. The system primarily incorporates a GSM SIM 900A module, which enables communication via GSM technology, allowing the system to send and receive data, voice calls, and text messages (SMS) over a mobile network. A microprocessor is interfaced with the GSM module to regulate the door's locking and unlocking mechanism. The system was tested using a mobile phone and a DC motor, with a specific focus on the password functionality. When the correct four-digit password (1234) is entered, it is displayed as asterisks on an LCD screen for security purposes. The system is designed to be operated remotely from the owner's authorized mobile phone, providing enhanced convenience and security and eliminating the need for traditional keys, especially in cases where a key is lost or stolen. The implementation of this system offers great potential in terms of both safety and ease of use. Future improvements include replacing SMS with voice calling for even greater security. This GSM-based door lock security control system holds significant applications in various sectors, including education, safety, and economic settings. The results show 98% accuracy in door lock security while 95% success rate in opening the door to the designated areas.