土壤湿度的测量及智能浇灌系统的研制
首发时间:2009-07-09
摘要:本文创建了电阻—频率转换检测土壤湿度的新方法,引入R-F振荡电路,将土壤中两电极间的电阻转换成振荡电路中电信号的频率,采用可编程器件或单片机系统测量芯片NE555产生的整形方波的频率,实现了对电路频率的即时测量,进而实现了连续自动监测土壤的湿度,同时保证了测量土壤湿度的准确性。本文利用此方法设计了一个结构简单、操作方便的自动浇灌系统。整个浇灌系统由湿度传感器、温度传感器、光强传感器、控制信号、按键、太阳能电池、交流供电系统(备用)、LCD显示屏、Mega8单片机等组成。由单片机采集湿度、温度和光强信号,并根据所设定的逻辑条件来决定是否进行灌溉。该系统实现了家庭种花、园林绿化的自动浇灌。
关键词: 土壤湿度 土壤电阻率 R-F转换检测电路 自动浇灌系统
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Measuring soil moisture and designing a automatic watering system
Abstract:This paper presents a new approach to measure soil moisture. The method is based on resistor–frequency converter circuit and converts soil resistance into circuit oscillation frequency. With the application of SCM NE555, the frequency of output waveform as well as the circuit oscillation frequency becomes available. In this way, the method is able to measure soil moisture continuously and automatically. At the same time, the accuracy of the measurement is secured. With the method mentioned, an intelligent irrigation system has been designed. The entire irrigation system consists of humidity sensors, temperature sensors, light sensors, control signals, keys, solar batteries, AC power supply system (standby), LCD display and Mega 8 SCM NE555. The system utilizes SCM to collect moisture, temperature and light intensity signals and will irrigate according to set logical conditions. The system achieves automatic irrigation of family and landscaping use.
Keywords: soil moisture soil resistance resistance-frequency converter circuit intelligent irrigation system
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