This document provides a detailed overview of an aquaponics monitoring and control system. The system utilizes various sensors to monitor water quality parameters such as temperature, pH, Total Dissolved Solids (TDS), and Dissolved Oxygen (DO). An Arduino Nano ESP32 microcontroller processes the sensor data and controls a water pump via a relay based on the readings.
AHT10
Buck Converter
Lipo Battery 2200mAH 30c
1-Channel Relay (5V 10A)
PH Meter
Water Pump
Arduino Nano ESP32
TDS Sensor
Temperature Sensor
DO Sensor
#include <Wire.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <AHT10.h>
#include <DFRobot_ESP_PH.h>
#include <DFRobot_DO.h> // Added dissolved oxygen sensor library
// Pin Definitions
#define TDS_SENSOR_PIN A0
#define PH_SENSOR_PIN A3
#define DS18B20_PIN 5
#define RELAY_PIN 8
#define ONE_WIRE_BUS DS18B20_PIN
#define DO_SENSOR_PIN A1 // Added pin for dissolved oxygen sensor
#define SCL_PIN A5 // Typical SCL pin for I2C
#define SDA_PIN A4 // Typical SDA pin for I2C
// Sensor Objects
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature tempSensor(&oneWire);
AHT10 aht10;
DFRobot_ESP_PH ph;
DFRobot_DO do_sensor; // Dissolved oxygen sensor object
float tdsSensorValue = 0;
float phValue = 0;
float doValue = 0; // Dissolved oxygen value
void setup()
{
Serial.begin(115200);
// Initialize I2C with specific SCL and SDA pins
Wire.begin(SDA_PIN, SCL_PIN);
// Initialize Sensors
tempSensor.begin();
// AHT10 Initialization
if (!aht10.begin())
{
Serial.println("AHT10 not found. Check wiring!");
}
// PH Sensor Initialization
ph.begin();
// Dissolved Oxygen Sensor Initialization
do_sensor.begin();
// Relay Setup
pinMode(RELAY_PIN, OUTPUT);
digitalWrite(RELAY_PIN, LOW);
}
void loop()
{
// Read Temperature Sensors
tempSensor.requestTemperatures();
float waterTemp = tempSensor.getTempCByIndex(0);
// Read AHT10 (Humidity and Air Temperature)
float humidity = aht10.readHumidity();
float airTemp = aht10.readTemperature();
// Read TDS Sensor
tdsSensorValue = readTDSSensor();
// Read PH Sensor
phValue = readPHSensor();
// Read Dissolved Oxygen Sensor
doValue = readDOSensor(waterTemp);
// Print Sensor Readings
Serial.println("--- Aquaponics Sensor Readings ---");
Serial.print("Water Temperature: ");
Serial.print(waterTemp);
Serial.println(" °C");
Serial.print("Air Temperature: ");
Serial.print(airTemp);
Serial.println(" °C");
Serial.print("Humidity: ");
Serial.print(humidity);
Serial.println(" %");
Serial.print("TDS Value: ");
Serial.print(tdsSensorValue);
Serial.println(" ppm");
Serial.print("PH Value: ");
Serial.print(phValue);
Serial.println("");
Serial.print("Dissolved Oxygen: ");
Serial.print(doValue);
Serial.println(" mg/L");
// Control Relay (example: turn on if water temp is below 20°C)
if (waterTemp < 20.0)
{
digitalWrite(RELAY_PIN, HIGH);
}
else
{
digitalWrite(RELAY_PIN, LOW);
}
delay(5000); // Read sensors every 5 seconds
}
float readTDSSensor()
{
int sensorValue = analogRead(TDS_SENSOR_PIN);
float voltage = sensorValue * (3.3 / 4095.0);
float tdsValue = (133.42 * voltage * voltage * voltage - 255.86 * voltage * voltage + 857.39 * voltage) * 0.5;
return tdsValue;
}
float readPHSensor()
{
static unsigned long samplingTime = millis();
static unsigned long printTime = millis();
static float pHValue, voltage;
if (millis