Aquaponics Monitor: Fish Tank and Plant Bed Sensors

Aquaponics combines fish farming with soilless plant growing. Fish waste feeds plants; plants filter water for fish. Monitoring water temperature, pH, dissolved oxygen, and grow bed conditions ensures both thrive.

What Is Aquaponics

Fish produce ammonia; bacteria convert to nitrates; plants absorb as fertiliser; clean water returns to fish. Ideal for urban India where land is expensive. A 500 sqft rooftop system produces 200kg tilapia and 500kg leafy greens per year.

Critical Parameters

Water temperature: tilapia thrives 26-30C, stops feeding below 20C, mortality risk below 15C. Air temp and humidity affect plant transpiration. Water level cycling in flood-drain beds critical for root health. pH compromise 6.8-7.2 for fish and plants.

Sensor Setup

Fish tank: DS18B20 waterproof probe mid-depth for water temp + HC-SR04 for water level. Grow bed: DHT22 for air conditions. Sump: second DS18B20 for return water temp comparison.

Building the System

Arduino monitors all sensors. Heater relay activates when water 10cm below normal.

waterTemp.requestTemperatures();
float wt=waterTemp.getTempCByIndex(0);
digitalWrite(HEATER, wt<26 ? HIGH : LOW);

Alert Thresholds for India

Critical water temp: below 22C or above 33C. Warning: below 24C or above 31C. Humidity warning: below 50% or above 95%. Water level: alert if >10cm drop.

Scaling to Commercial

Commercial systems need redundant sensors, GSM/WiFi alerts, and backup heating. ESP32 with dual DS18B20 probes for failure detection. Critical for Rs 50,000+ fish inventory.

Frequently Asked Questions

Best fish for Indian aquaponics?

Tilapia for warm water 26-30C. Common carp for cooler regions tolerates down to 10C.

Check parameters how often?

Sensors read continuously. Test pH and ammonia manually twice weekly.

Power cuts?

Biggest risk. Install 12V battery backup for air pump. Fish die within 30-60 min without aeration in dense tanks.

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