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Real Time Controller System for Lowland Tropical Greenhouse

Real Time Controller System for Lowland Tropical Greenhouse

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亚洲精细农业与计算机农业应用联合大会

作者： Wan Ishak Wan Ismail Nurul Hanizah Faculty of Engineering Universiti Putra Malaysia

The environmental problem faced by the tropical countries like Malaysia is due to the high relative humidity and temperature of the outside air, which increase the ambient humidity and temperature of the greenhouse. In lowland greenhouse, it is possible that the air temperature can be decreased to the desired value by mixing with a certain amount of dried-cooled air from a cooling source The Vapor Pressure deficit （VPd） analysis introduces an approach to develop a better basis of environment control for lowland greenhouse in Malaysia. The VPd software for the greenhouse control system was developed using the studies of VPd which can be used to identify air moisture conditions for plant production while taking into account different temperature levels. Vapor Pressure deficit functions as a convenient indicator of the condensation potential as it quantifies how close the greenhouse air is to saturation. The concepts of VPd can be used to establish set points for temperature and relative humidity, which are two important environmental factors influencing the growth and development of greenhouse crops. The real-time controller using a PIC16f876A was developed to maintain the ideal Vapor Pressure deficit （VPd） inside the lowland tropical greenhouse located at the Universiti Putra Malaysia. A LM35 3-pin temperature sensor was connected to a microcontroller to determine the temperature in the greenhouse for required time and period. This device can measure temperature from 2 0 C up to 100 0 C and the output voltage temperature relationship is 10mV/ 0 C. The humidity sensor that was used in this project is hh10d. It is a frequency output type sensor that can be easily integrated with user application system. Cooling is required to decrease the ambient temperature and adjust the relative humidity level inside greenhouse. Greenhouse cooling reduces plant stress caused by high leaf and air temperatures Evaporative cooling systems are used in conjunction with mechanical ventila

关键词： Greenhouse Microcontroller Vapor Pressure deficit (VPd) Temperature Relative humidity PIC16f876A LM35 temperature sensor hh10d humidity sensor

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