1) The document describes an automatic water supply system that connects or cuts off the water supply based on the presence of humans in the home. 2) The system uses an Arduino controller connected to a door lock and solenoid valve. When the door is locked, the Arduino cuts power to the solenoid valve, stopping the water supply and preventing waste. It also sends an SMS notification to the homeowner. 3) The system aims to conserve water by stopping supply when homes are unoccupied, like when residents leave taps on by accident before leaving for work or travel. This prevents wasted water and shortages, especially in areas with scheduled water supply.