Abstract: Dissolved oxygen - oxygen molecules dissolved in water - is a key indicator of water quality. Like the air we breathe, the survival of aquatic life depends on sufficient levels of dissolved oxygen in the water. When water drops below the level necessary to support life, it causes a significant decrease in water quality, often referred to as low dissolved oxygen (DO). Dissolved oxygen in water is a key parameter for maintaining healthy aquatic life. Different aquatic animals require different concentrations of dissolved oxygen to survive. Dissolved oxygen is usually measured in mg/L or ppm (parts per million). The OxySen Pond (Oxygen Sensing Pond) is a real-time dissolved oxygen monitoring system that covers fish ponds as large as 10 hectares. It consists of 4 nodes, 1 of which is the master node and the remaining 3 are slave nodes. All these slave nodes communicate with the master node, then the master node uses a GSM module to upload public data to the MQTT (Message Queuing Telemetry Transport) cloud, thereby monitoring real-time data remotely and providing precise and accurate recommendations.
Keywords: Dissolved Oxygen, OxySen Pond, Mesh networking, MQTT, ESP32, GSM Module.
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