Ultrasonic Sensor Based Door Security Camera with Wireless Data Transfer in Telegram Bot Using WIFI

A door is an essential element to house security. The residents of the home will keep the door always shut for the sake of security. However, there are times when the home's resident rush out the door and fail to lock it, or they may question if they have whether to lock the door. The program suggest is called Door Security System, and it is based on Android application which tracks the condition of the door using Internet of Things (IoT) technology, managing the door either it is open or close. The ultrasonic sensor is used to detect any person who is standing in front of the door within 2 meter. The camera is used to take image and it send information to Telegram Bot using MQTT protocol. The door lock is appropriately encrypted to ensure message security.