| China has a great advantage in the aquaculture,and become one of the largest in the world in terms of the yield.However the past way of aquaculture cannot meet the development requirements of modern aquaculture anymore,intensive recirculating aquaculture mode is the future trend,adjust the water quality to the suitable level is critical to the increasing of harvest.It is going to be true with the development of the Internet of things.Because of the advanced sensors for detecting the water quality mostly rely on imports,the price is so expensive for many people.And the range of one single sensors can detect is limited,it cannot reflect the whole fish pond.Aiming at the problem,this paper design a kind of low cost water quality monitoring system based on the IoT architecture,which can dectect multi place with only one single sensor.This system is composed of water sample collection facility,cleaning device,field controller,wireless transmission module,remote server and Android client.Among them,the water quality sampling facilities in the system consist of pumps,one-way valves,pipelines and monitoring tanks.The water samples from different fishpond are transported to the monitoring tank at a time.The pumping sequence and time of each sampling point are determined by the corresponding parameters in the controller.The cleaning device is based on the principle of ultrasonic cleaning to remove the scale of the sensor in the box,avoiding the influence of the sensor due to the influence of fish excreta and other particulates,causing the reading to deviate from the reality.The field controller includes the modules of microprocessor,drive control and so on.It is responsible for collecting and uploading the water quality parameters,automatically controlling the operation of the field equipment according to the operating parameters,receiving the user instruction to change the operating parameters,and completing the field human-computer interaction and other functions.The wireless communication module is responsible for transmitting the information collected by the field controller to the remote cloud server,and receiving the instructions from the remote server user to send the controller to the remote monitoring of the breeding site.The remote server is written in the Java language and is responsible for the analysis and storage of the data uploaded on the spot.The client uses PC terminal robomongo and mobile terminal Android software to visualize the user’s on-site monitoring parameters.The Android client can send control instructions to the field controller to achieve remote control of the device.In this paper,the experiment is carried out in the aquaculture test base named MingYou,which is seated in seagull island,Guangzhou.The experimental results show that after transporting by the fixed length pipeline,the change trend of the water of the fish pond’s water-quality index,such as dissolved oxygen and temperature is the same,and the error is within the acceptable error range.As for collecting the water of fish pond from different distance,there is a significant linear relationship between the response time of the system and the distance of the pumping water.The time of pumping is set more reasonably,the consistency of the dissolved oxygen data between the sampling point and the monitoring point is more better.After ten minutes of ultrasonic vibration cleaning,the sensor affected by the fouling can restore the correct reading.This paper solves the problem that the single group sensors can not monitor multiple place of the fish pond by transporting the water in different part of the fish pond at the same water tank according to different time,so that it can reduce the cost and maintenance cost of the system.Besides,the ultrasonic cleaning can effectively remove the dirt attached to the probe of the optical sensor. |
