Smart Door is an innovative project from the Smart Farm system that controls the opening and closing of barn or storage doors automatically. It uses motion or weight sensors to detect the presence of animals near the door. With a microcontroller like the ESP32 and a servo motor, the door can open or close based on certain conditions. Users can also control the door manually using a smartphone app. Smart Door improves security by preventing animals from escaping or strangers from entering without permission. The system is energy-efficient, activating only when needed. With Smart Door, farmers can work more efficiently and safely. This project supports the development of modern agriculture.