温湿度是控制农作物生长的主要因素，能够及时对温湿度进行测量并做出反应对

Temperature and humidity are the main factors that control the growth of crops, the ability to measure temperature and humidity and react to the agricultural development of great significance. This design is the analysis of the present situation of the greenhouse temperature and humidity measurement and control system of vegetables, according to the study and design from its problems. The design of both the hardware section, there is a circuit that contains the software, the main achievement of temperature and humidity range of user-defined comparison, take appropriate measures to achieve the temperature and humidity temperature and humidity range has been defined to provide the best environment for growing vegetables. Whole primarily by the design STC89C82 microcontroller core, through the key setting range of temperature and humidity, using DHT11 external environmental temperature and humidity sensor acquisition, appears on the LCD 1602, while compared with the temperature and humidity from the defined range, if the range in , alarm and alarm circuit starts to take heating, cooling, humidification, dehumidification measures the environmental temperature and humidity control. This system is simple, strong anti-interference ability, low cost, good performance, and practical, has great room for development.

Temperature and humidity is the main factor to control crop growth, and it is of great significance for agricultural development to be able to measure and react to temperature and humidity in a timely manner. This design is mainly in the analysis of the domestic and foreign greenhouse vegetables temperature and humidity measurement and control system status, and according to its existing problems to study and design. The design has both hardware parts, including software circuits, mainly to achieve user-defined temperature and humidity range comparison, take appropriate measures to make temperature and humidity to reach the defined temperature and humidity range, to provide the best growth environment for vegetables. The whole design is mainly stat89C82 microcontroller as the core, by pressing the button to set the temperature and humidity range, using DHT11 sensor to collect the external ambient temperature and humidity, appear on the 1602 LCD screen, and at the same time with the custom temperature and humidity range, if not in this range, the alarm circuit began to automatically alarm and take heating , cooling, humidification, dehumidification and other corresponding measures to control the environment temperature and humidity. The system is simple in structure, strong anti-jamming ability, low cost, good performance, practicality, with a lot of room for development.

Temperature and humidity are the main factors to control the growth of crops. It is of great significance for agricultural development to measure and respond to the temperature and humidity in time. This design is mainly based on the analysis of the current situation of greenhouse vegetable temperature and humidity measurement and control system at home and abroad. This design has hardware part and software circuit. It mainly realizes the user-defined temperature and humidity range for comparison, and takes corresponding measures to make the temperature and humidity reach the defined temperature and humidity range, so as to provide the best growing environment for vegetables. The whole design is mainly based on stc89c82 single chip microcomputer. The temperature and humidity range is set by pressing the key. The external environment temperature and humidity are collected by DHT11 sensor and displayed on the 1602 LCD screen. At the same time, it is compared with the customized temperature and humidity range. If it is not in the range, the alarm circuit starts to automatically alarm and take corresponding measures such as heating, cooling, humidifying and dehumidification to the environment Control the temperature and humidity. This system has the advantages of simple structure, strong anti-interference ability, low cost, good performance, strong practicability and great development space.