Abstract
The current aims to apply the Internet of Things technology (IoT) in designing an automatic system for measuring and monitoring important parameters of aquaculture ponds such as temperature, pH, and dissolved oxygen (DO). The system includes the Arduino Nano main microcontroller (the device that transmits and pushes data to the Raspberry Pi 3 Web server), the DS18B20 temperature sensor module, the pH sensor module V1.1, and the DO Sensor SKU SEN0237. The system is capable of continuously measuring the above parameters of aquaculture ponds. The measurement results are stored and transmitted wirelessly to smart devices such as computers and mobile phones. Farmers can continuously monitor water quality parameters of aquaculture ponds (pH, DO, temperature) through these smart devices. In addition, a warning message will be sent to the farmer's phone when the DO index of the aquaculture pond falls below the prescribed level. The results of the test evaluation also show the high accuracy of the system when compared with the sample measuring device. All relative errors are satisfied less than the limit value of 5%.
Highlights
Vietnam is a country with a dense system of rivers and long seaways, which is very convenient for developing fishing and aquaculture activities
The indicators of the aquaculture ponds such as temperature, pH, and dissolved oxygen (DO) are measured by sensors and converted into voltage signals that are sent to the Arduino Nano central microcontroller
We set the DO threshold limits at 2.0 mg L-1, if the DO level of the pond fell below 2.0 mg L-1, it would turn on the oxygen aerator to provide in-time with the amount of DO for the pond, and through the SIM 900A module, a warning message would be immediately sent to the farmer's phone
Summary
Vietnam is a country with a dense system of rivers and long seaways, which is very convenient for developing fishing and aquaculture activities. According to data from the Vietnam Association of Seafood Exporters and Producers (2020), Vietnam's seafood production has maintained continuous growth over the past 17 years with an average increase of 9.07% per year. Water quality in aquaculture ponds plays a crucial role in the growth and development of aquatic animals. Indicators that directly influence water quality in aquaculture ponds are DO concentration, temperature, pH, NH3, Nitrite, H2S, alkalinity, salinity, mineral concentration, nitrate concentration, phosphorus concentration, bacterial density, and algae density, etc. All of these indicators must be within the threshold limits. As long as one of the above indicators exceeds the threshold limits, aquatic animals will be affected. It is imperative to control all water quality indicators and have timely treatments to ensure they are within the threshold limits
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