Enhancing Home Security through an Android-based Door Security System using IoT Technology

The security of a home largely depends on the effectiveness of its door lock system. However, instances of occupants forgetting to lock the door or doubting its status due to time constraints are not uncommon. To address this issue, we propose an innovative Android-based application called the Door Security System, which leverages Internet of Things (IoT) technology to monitor, control, and enhance the security of a house. The system utilizes the MQTT cloud as a communication protocol between the smartphone and the door lock mechanism. The Door Security System incorporates various sensors to ensure comprehensive monitoring. A Passive Infrared (PIR) sensor is implemented within the door lock to detect any movement near the door, while a touch sensor is installed on the door handle to recognize human interaction. In the event of forced entry, an alarm will promptly ring and send notifications to the house occupants, effectively alerting them about the presence of an intruder. Evaluation results demonstrate the accuracy of the motion detection sensor, accurately detecting movements up to 1.6 meters ahead. Additionally, the communication between the smartphone and the door lock system is securely encrypted, ensuring the safe transmission of messages. Furthermore, the system incorporates Simple Mail Transfer Protocol (SMTP) to send an email notification to the occupants, including an attachment—a photo captured using the ESP32-CAM. The proposed Door Security System, with its integration of IoT technology, presents a robust solution to augment home security. By providing real-time monitoring, remote control, and immediate notifications, it offers peace of mind to house occupants, allowing them to securely manage their doors from anywhere. The utilization of sensors, MQTT cloud, and encrypted communication ensures the system's reliability and effectiveness.