Potted Plants Growth Process Of Soil Moisture Monitoring And Control System

Potted plant growth process soil moisture monitoring and control system is based on the summarizations of foreign and domestic status of researches, by using soil humidity sensor and single-chip microcomputer control unit to design a potted plant growth process of soil moisture monitoring system, this system can solve the problems which people plant potted plants in the planting process, at the same time it also has low cost, high practical and so on.This thesis mainly from the following several aspects:First, the paper summarized the potted plants grow moisture measurement, expounds the research progress in control systems to monitor potted plant growth process change of moisture, points out the existing problems, and the future research direction and the development trends are discussed. Second, the existing indoor plants growing process characteristics of moisture, designed a set of control system, the system mainly consists of soil moisture sensor, humidity signal amplifier circuit, the data acquisition circuit and single-chip microcomputer control system, relay control circuit, solenoid valve and drip irrigation equipment, etc, the soil moisture sensor adopts a homemade copper alloy electrode materials for probe, and do some processing after use, will keep on soil moisture scope of certain humidity, the accurate detection of soil moisture plus amplifier circuit can ensure real-time monitoring soil moisture, Humidity signal amplifier circuit in order to achieve the optimal control of soil moisture and measurement, satisfy the need, its interface chip soil humidity sensor output will enlarge the signal to the A/D converters need 0～15V voltage range, Data acquisition circuit by signal circuit and A/D conversion chips, A/D conversion chip and data transfer between microcontroller, STC89C52 system adopts single-chip microcomputer control chip control, Relay control circuit, signals according to chip controlled electromagnetic valve switch, Electromagnetic valve and drip irrigation systems to water plants are, This system has the timing acquisition, storage and data analysis of the function is described in detail, and the hardware circuit and software programming. Third, the soil moisture content, use stoving drying experiment method to calculate the normal soil moisture content of the soil moisture content and measure numerical values of the measurement and control system, to set limit and irrigation water to limit, through continuous potted plants were observed after the water and the soil moisture content, every day to set of measurement and control system of water cycle and water through the potted plants, and the calculation of the moisture content of the drip irrigation equipment, to set the speed of potted plants every irrigation water, through the three test time, set a potted plant growth process of the three indexes of soil moisture, the three indexes respectively:measurement system, the system of the upper value, system of irrigation water cycle time.In order to facilitate the system debugging, transplantation and modification, the software is designed as modules. The main program, the data acquisition subroutine, the time subroutines are designed according to system requirements. Due to the complicated working environment and the jamming from outside, the controller adopts over-voltage protection, decoupling capacitance, instruction redundancy and software trap to improve the system reliability in practice.In system design process fully considering the system performance, low price and performance and stability of components. This system is stable and reliable and practical use of simple, etc.