本研究旨在開發一具有人機操作介面之營養液調節與循環控制系統,系統可透過微控制器並配合模糊邏輯來控制營養液供給流量調節閥裝置進而維持養液槽內養液成分濃度達標準。硬體主要由營養液儲存容器、液體式調節閥、流量計模組、微控制器、水質感測模組( pH、EC、DO、營養液溫度)、離子電極感測模組(鉀、鈣、鎂、鈉、氯)、介面電路、水管路與電源模組等組成,營養液槽共5個,可裝入不同營養液,此五組養液槽所流出之流量可透過液體式調節閥進行控制,使用者可透過人機操作介面選擇所需栽培的作物透過模糊邏輯推論與知識庫來進行營養液中之pH與EC濃度值調控,或者採手動設定各營養液所需達到的濃度,達到營養液自動調配的目的,另外,介面上還會顯示目前植栽床內營養液離子濃度值以及歷史資料曲線變化。本套系統建構附於一長、寬及高度各為120公分、60公分以及11公分立體栽培床,並配合自製之LED 植物生長燈具,經由實驗結果可得知本文所提出的系統可有效維持使用者所設定栽培床內植物生長所需各營養液濃度標準,達到種植省工化的目的,相關植物生長組織反應比較也在此論文中進行說明與討論。
This research aims to develop a human-machine-interface (HMI) based nutrient solution irrigation system which applies to hydroponics cultivation for plant. The proposed system includes personal computer, microcontrollers, flow-meter modules, water quality monitor modules ( pH, EC, DO, solutions Temp), ion electrode sensing modules ( potassium, calcium, magnesium, sodium, and chlorine ), the peripheral circuit, power modules, pipe, nutrient solution storage tank, and liquid-regulating valve. The five types of flow rate of nutrient solution are controlled, respectively, by a microcontroller, which drives flow control valves. The user can select the desired plant name on the HMI or setup nutrient solution concentrations manually, which results in an automatic deployment of nutrient solution for plant growth (by default, five types of plant nutrient solution database are stored in memory). Meanwhile, the current nutrient solution concentrations within a cultivation bed are shown in HMI. The experiment is conducted in a cultivation bed (120 cm60 cm11 cm (LWH)) with a lighting emitting diode (LED) lighting board. The experiment results demonstrate that each of tolerable concentration range of nutrient solutions can be maintained by using the proposed system.