This final project was aimed to build a model of Air Conditioning Equipment Pond Fish Spawning ATmega8 microcontroller-based. This device was expected to function to assist community fish farmers in fish spawning process that requires setting the water temperature automatically.ud This tool was developed in several stages namely, (1) Identification of Needs, (2) Needs Analysis, (3) System Design, (4) Hardware Design, (5) Software Design, (6) Technical Operations, and (7) Testing Equipment. The design of this tool is realized by combining several systems of power supply circuit, LM35 temperature sensor, push button, the LCD 16x2 lines, the control circuit and microcontroller ATmega8 as processing units. Software design as a control program in this ATmega8 microcontroller used C language and compiler software CVAVR as his. The testing of this tool is by entering the LM35 temperature sensor into the water. LM35 sensor output was connected to the ATmega8 microcontroller ADC input for processing into digital numbers for controlling the cooling elements and heating elements. If the water temperature is less than the minimum limit has been determined, then the cooling element will be on. If the water temperature is more than the maximum limit specified, then the heating element will be on. If the water temperature between the minimum and maximum temperature within the limits specified temperature, the cooling elements and heating elements will be off. The tool also displayed the temperature value into the LCD in accordance detected by the temperature sensor.ud After testing the data, it can be concluded that this tool can work in accordance with the plan. This tool can adjust the water temperature range 0 ° C to 40 ° C with a volume of 2 liters of water.
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