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  • The Design of Monitoring System Clarity and Turbidity of Water Quality in Aquarium with SMS Gateway based on AVR ATMega16 Microcontrolleris one tool that can be used to facilitatefor someonetocheck the aquarium from distance. Many people who like keeping fishconfusion if they are go away from home, because no one maintains the fish well. If the dirty water still left, it canbe obstruct the growth of fish. This tool is designed not only to understand in terms of the theory but also in practice. Here the author will discuss the photodiode sensor that serves to detect and provide information clean or notthe water in the aquarium.Microcontroller will receive information when the photodiode sensor with a low resistance, the aquarium pump will be active, then the water will be filtered untilphotodioda sensor detects the water clean again .To turn on the pump, the microcontroller will give orders to relay to connect the pump to a voltage of 220 VAC. Pumps will light up when the relay has received an order from the microcontroller. At the same time GSM Module will send a text message to the user when the water was dirty and the LCD display will show the water on turbidity conditions.