This literature survey explores existing research relevant to the development of an Automatic Water Dispenser project. This project aims to revolutionize water dispensing through a touch-free and app-controlled approach. It leverages sensor technology for hands-free activation, eliminating the need for physical buttons and screens. Users simply place a container under the dispenser to initiate water flow. Additionally, a companion app allows for precise control over the dispensed volume. This literature survey aims to establish a foundation for the development of an automatic water dispenser that promotes hygiene, user convenience, and responsible water usage.