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  • Applications water flow sensor G1/2 is a tool that can monitor the amount of water usage and display it directly using LCD (Liquid Crystal Display). On the application of water flow sensor G1/2 is used to notify users of tap water in order to strive to conserve water used. By using Arduino UNO as a data processing center which will tell the amount of water usage. In addition, it also limits the use of water when water usage is past due on their use set out in programming Arduino UNO. Automatic water faucet uses ultrasonic sensors HCSR-04 as an on/off solenoid valve faucet that will be active when an object blocking the ultrasonic sensor <20 cm. In this case when the object blocking the ultrasonic sensor faucet valve solenoid valve will open automatically using relay circuits so that more water out of the faucet. When the solenoid valve opens the valve tap water that comes out will be directly calculated by a water flow sensor G1/2, which will be processed by the Arduino UNO and its data will be sent directly to the LCD (Liquid Crystal Display) to display the amount of water. By the time the water has passed through the usage limit then tap solenoid valve will immediately close the valve and turn off the function of the ultrasonic sensor so that it does not work again until returning reset.