The research aimed to use simple microcontroller circuitry to control temperature, humidity and showering inside a greenhouse. A 3x2x2m (LxWxH) green house was built and installed with Air Conditioner (AC) 0.5pK, heater, sprinkle and 8-watt tube lamp. Green house condition without climate controller was recorded and showed that the highest temperature inside was between 25OC and 42OC meanwhile temperature outside was between 23OC and 38OC. To observe different condition, the system was set to minimum temperature and the result was between 20OC to 28OC on the inside, while outside temperature was between 20oC to 38oC. The last experiment was setting the controller at a designated condition and revealed that it was successful to maintain the temperature between 25oC to 30oC while outside temperature was between 20OC to 42OC. During the experiment humidity inside the green house was able to maintain between 75%-93% while outside humidity fluctuated between 53%-93%. The data indicated that the design was able to control the green house climate.