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The cable acquisition and control system of the traditional greenhouse has many disadvantages such as complicated wiring, high cost and lack of accuracy and expansibility. In order to solve those problems, a greenhouse acquisition and control system based on ZigBee wireless sensor network (WSN) is designed in this paper. The ZigBee with temperature sensor DS18B20 and humidity sensor AM2301 is used...
Collection of environmental parameters and control of equipment in greenhouse are the main contents of the greenhouse management. Aiming at the defect of traditional wired monitoring system, this system designs a wireless sensor and control system based on ZigBee. With CC2530 wireless network chip as the core, its peripheral interface has been integrated with AM2301, DS18B20 temperature and humidity...
Greenhouse microclimate control system is a typical hybrid system, in which the discrete (or logical) variables and continuous variables interact. The existence of outside measurable but uncontrollable disturbance inputs including outside temperature, humidity, wind speed, solar radiation, and et al, makes the control problem of greenhouse microclimate a challenging one and some conventional control...
This paper is concerned with how far a combination of auto regressive moving average model with external input and neural network (NNARMAX) can ameliorate the modeling performance for the inside humidity of an unheated, naturally ventilated greenhouse in autumn under east-central China conditions. The environmental factors influencing the inside humidity, including outside air temperature and humidity,...
Most of the greenhouse climate control equipments in China are on-off control. The control variables are discrete while the disturbance inputs (the outside air temperature, relative humidity and solar radiation, etc.) are continuous, so the microclimate system in greenhouses is a typical hybrid system. The outside air temperature and relative humidity are used as the disturbance inputs and the inside...
Linear auto-regression moving average with extra input (ARMAX) model for air temperature system in a naturally ventilated greenhouse was developed. Outside air temperature, relative humidity, global solar radiation and wind speed were used as disturbing input variables of the model, while inside temperature was used as output variable of the model. Based on energy and mass flows equations, statistic...
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