The system above consists of five input (temperature, humidity, Light, soil moisture sensor and carbon dioxide sensor) are four outputs (Fan, water pump, Lamp and sprinkler). Microcontroller is the main brain for this system because it controls the overall system in the Green house. Temperature sensor used to detect the temperature in the greenhouse. When temperature sensor detects the high temperature, microcontroller will send the signal to the fan to stable the greenhouse condition. Then, when light sensor detects no light, microcontroller will send the signal to lamp and lamp will be ON automatically. Water pump is used to supply water to the sprinkler and make sure the sprinkler watered the plants in the greenhouse, thus carbon dioxide is the natural gas, which is dangerous for human in high concentration, but a lifeline for trees and plants. Carbon dioxide is an important greenhouse climate variable, which enhances the growth of the plants. Sunshine and lights increases the amount of carbon dioxide.
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