Agriculture is one sector that is vital to the lives of the people of Indonesia. Along with the development of technology, the agricultural sector is also experiencing growth. One development is the development of suitable cropping pattern without soil media, namely hydroponics. One of the problems faced in the cropping pattern are environmental factors as well as nutrients that can affect the water quality of the plant. Of these issues, created a climate control system and replacement of nutrients in hydroponic plants. The system is also accompanied by a minimum system microcontroller ATMega 16 as controlling the entire circuit consisting of relays, LCD, pH sensor, sensor LM35, lights and fans that serve as controlling the temperature to remain stable. With the making of this instrument, is expected to facilitate maintenance and optimize plant growth so that plants can grow well and produce a quality product as expected
