Design of Automatic Greenhouse Environmental Monitoring System

In order to satisfy the planting requirements of vegetables in north cold area of China, an automatic monitoring and controlling system of greenhouse interior environment was developed. By synthetically considering the temperature, humidity, illumination intensity, CO2 concentration, and their mutual influences, the system adopts an environmental regulation method based on set point control to automatically control the internal environment of the greenhouse. The system could provide a long-term stable tool to measure and analyze the environmental information in greenhouses. The test showed that the temperature in greenhouse could be maintained at the needed level while the relative humidity and illumination intensity could be controlled within the suitable scope as well. Introduction The greenhouse system is regarded as the innovation of modern agriculture that provides crops with the favorable environmental conditions [1]. A greenhouse is a closed environment that can be actively controlled to improve the crop yields [2]. Therefore, monitoring and regulating the greenhouse environment is very important for growing crops in the greenhouse. There has been a rich literature focusing on the monitor and control problem in the greenhouse [3-6]. In [3], with deployed wireless sensor networks (WSN), the system automatically collect greenhouse environmental information and crop growing information, then transmits the data to a remote database, and uses the Web to monitor the greenhouse. In [4], the Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) algorithm has been introduced into the greenhouse environment monitor system, and the parameter reduction dimension in the greenhouse environmental control model was realized. In [5], a high-level multi-objective optimization method was studied to achieve greenhouse control. In [6], climate simulation was conducted for artificial growth box and greenhouse with temperature gradient, and the crop response under simultaneous/separate effects of temperature, CO2 concentration and water utilization were studied. The system proposed in this paper is designed based on the greenhouse environment information collection and automatic control, aiming to improve the crop growth environment and improve crop quality. System Architecture The greenhouse is an agricultural technology that can change the environment in which plants grow. According to the optimal growth conditions for crop growth, the greenhouse climate is adjusted to meet the needs of plants throughout the year. There are many environmental factors that need to be noticed during the growing process of crops. The main factors affecting the greenhouse environment are temperature and humidity, illumination intensity, and carbon dioxide concentration as the monitoring targets. The greenhouse system consists of micro-controller, sensors net, control module and GPRS-DTU. The overall structure is shown in Fig. 1. The system was structured based on STM32F103ZET6 microprocessor which realizes the collection of greenhouse environmental parameters and the control of the implementing agency. Then, the environment parameter data were sent to the server of monitoring center via GPRS network. Finally, the remote monitoring system can store data and analyze data. 8th International Conference on Management and Computer Science (ICMCS 2018) Copyright © 2018, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Computer Science Research, volume 77