A Microcomputer-Based Control System for Green House (I) -Water Management-

시설원예(施設園藝)에 있어서 재배관리(栽培管理)의 자동화(自動化) 시스템에 관(關)한 연구(硏究) (I) -물관리 자동화(自動化)-

As a part of study on automatic control system for green houses, an automatic irrigation system was developed by using microcomputer. For the study, gypsum block was used as a sensing device of soil moisture and its data was designed to transfer to microcomputer through A/D converter. Also, software which be able to control the irrigation time and flow rate by the solenoid valve was developed. This system was tested by using practical data and the following results were summarized. 1. Since the gypsum was very accurate in addition with chiep and easy to manufacture, it turned out to be a very good device to detect the soil moisture in this system. 2. Also, solenoid valve was very excellent device for controlling the water flow rate since its control error is less then 1% when the irrigation time is over 100 seconds.