This final project aims to create a system that works to help the community in the process of opening and closing the gate automatically. Tools circulation of this water-based microcontroller ATmega8 that serves as the central data processing and system control center.ud The method used in building simulasi alat sirkulasi air berbasis mikrokontroler Atmega8 of this design method that consists of several stages: (1) Identification of Needs, (2) Needs Analysis, (3) The design of the hardware, namely: a microcontroller AVR ATmega8 as input and output, a DC motor that serves as the driving gate, two floating sensors that function as a comparison of high surface in rivers and ponds, ADC to convert analog voltage into digital data, akrelik in the manufacture of prototype, (4 ) software, including: CodeVision AVR and the C language, (5) Preparation and (6) testing, in order to get a simulasi alat sirkulasi air berbasis mikrokontroler ATmega8 system.ud The result of the design and manufacture of simulasi alat sirkulasi air berbasis mikrokontroler Atmega8 This can work well. The performance of this tool was observed by comparing the value of the comparison of two sensors that vary in terms of stress and then read by the microcontroller. If the value obtained by the sensor is located on the river is higher than the sensors located at the pool, then the motor will move to "open" the door and the water flowed into the pond. The flowing water would fill the pond until the water level in the pool together with a high surface of the river, if this condition is met then the motor will move "close" the door.
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