Temperature and humidity recorder related design commentary
With the development of agricultural production, the cultivation of greenhouses has become more and more popular, and now soilless cultivation, water-saving irrigation, and factory-based farming have achieved unprecedented development in production. In order to make crops or vegetables grow off-season and get better economic benefits, it is necessary to control and record the temperature and humidity of the environment inside the greenhouse. At present, there are still some technical problems in data recording in middle and low-end greenhouses. If paper-based data recorders are still being used, the effects of electromagnetic interference on analog signals reflecting changes in temperature and humidity have not been completely eliminated. Because the temperature and humidity requirements of the crop within one day are not the same, the user must often grasp the temperature and humidity data values ​​to meet the needs of crop growth. The use of imported complete sets of control equipment in some high-grade greenhouses is powerful, but the price is quite high and the economic efficiency is too low. It is necessary to develop a temperature and humidity recorder that is applicable to existing greenhouses and that is inexpensive and reliable.
The temperature and humidity recorder software includes 2 major parts, microcontroller software and PC's PC software. Software design must not only satisfy various functions, but also ensure accuracy and speed. Designed in a modular structure, it strives to be simple and reliable. The entire software is divided into five modules: display module, data saving module, communication module, clock module, and setting module. The setup module mainly completes the setting and viewing of various parameters. The data acquisition software of the upper computer has very rich practical functions, such as printing, helping, generating record files, modifying, setting parameters, history curves, lists, registrations, deletions, alarms, and the like.
Although the digital temperature and humidity integrated sensor used in this system has high reliability, but interference and instability are always present, so filtering the collected data is still necessary, according to the long-term experimental analysis and practical use. It is concluded that the LTM8901 digital temperature and humidity sensor adopts a program to judge the filtering and median filtering of the composite digital filtering method, which can make the system have better performance.
With the development of computer technology, temperature and humidity recorders have entered the modern stage of computer-based. The temperature and humidity process data recorder is a computer system with a wide range of applications. It uses a new type of digital temperature and humidity integrated sensor and a C8051F023 microcontroller to constitute a temperature and humidity process data recorder. It has a simple hardware structure, low cost, and use and removal. Easy to install and maintain, temperature measurement, humidity data stability and other advantages, is an ideal system to replace the traditional temperature and humidity data logger, and can be used for other automatic temperature and humidity data recording, has a good application prospects.
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