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Basic factors affecting plant growth are sunlight, water content in soil, temperature, carbon dioxide, etc. These physical factors are hard to control manually inside a greenhouse and a need for an automated design arises. Automatically controlling all the factors that affect plant growth is also a difficult task as it is expensive and some physical factors are inter-related, for example, temperature and humidity are related in a way when temperature raises humidity reduces therefore controlling both together is difficult. Therefore simply, only some of the factors can be controlled. So an automated control system is designed for a greenhouse to control temperature, light intensity and soil moisture as they are some of the main physical factors affecting plant growth.