The increasing demand for efficient and sustainable agricultural practices has prompted the integration of Internet of Things (IoT) technology into traditional irrigation systems. This paper presents an innovative approach to automatic water supply for irrigation leveraging IoT principles. The proposed system incorporates a network of wireless sensors strategically placed in the agricultural field to monitor soil moisture levels, weather conditions, and crop requirements in real-time. These sensor nodes communicate seamlessly with a central controller using IoT protocols, enabling timely and informed decision-making. The central controller employs intelligent algorithms to analyse the data received from the sensors, determining the optimal irrigation schedule and water quantity needed for the crops. Through the integration of actuators and valves, the system automates the water supply process, ensuring precise and efficient irrigation. Furthermore, the system provides a user-friendly interface accessible through web or mobile applications, allowing farmers to monitor and control the irrigation process remotely. The implementation of this IoT-based automatic water supply system offers several advantages, including water conservation, enhanced crop yield, and reduced manual intervention. By leveraging the power of IoT, the proposed system contributes to sustainable agriculture practices, addressing the challenges of water scarcity and improving resource utilization in the context of modern farming.