Design Of WTH-4 Temperature And Humidity Wireless Environmental Monitoring System

The growing crop has its own scope of best living environment, the crop yield and the fruit quality will be affected by the environment of temperature and humidity in a certain extent, so accurately and stability environmental monitoring of the environment of the growing crop has certain significance. In view of the above content, this topic is focused on designing a wireless monitoring system of environmental factors. The system has easy operation, low power consumption, relatively far transmission distance and fast transmission of wireless monitoring system for environmental factors.The system is divided into three parts, Lower machine, host and PC. The single-chip microcomputer is the core part; use of nRF905 wireless transmission is used to transmit data. Through the design of software and hardware to realize the real-time collection of temperature and humidity information in different areas. Among them, hardware design includes:Power supply module design, Data acquisition module design, Wireless transmission module design and serial communication circuit design and so on. Data acquisition module includes soil moisture sensors, soil temperature sensor and the air temperature and humidity sensor. Software design includes:Data acquisition program design, Wireless data transmission program design and the design of PC program, data collection, the function of sending and receiving by using Keil software compiling and debugging C51 program, PC combined Lab VIEW and software interface to implement the data dynamic curve display and automatic save function.After completion of system overall design of system hardware and software debugging, and a functional test. After the test, the measured relative error of humidity is 0.64%, the relative error of temperature measurement is 0.89%, and communication distance is about 125 m. After finishing the design of the system and the test of the basic function of the system, the system will be applied in the environment factor monitoring tests of long jujube of Ling Wu in Ningxia. The test results show that the system can meet the expected requirements, stable operation, and good performance, suitable for agricultural application.This system innovation points as follows:The system could be used for a number of crop monitoring soil moisture content, soil temperature, air temperature and humidity information, and at the same time, according to the real-time monitoring and dynamic curve will automatically save all data, easy to use.