#include <Wire.h>         // For I2C communication (pH sensor and light sensor if needed)
#include <Adafruit_Sensor.h>

#define PH_SENSOR_PIN 25        // Define pH sensor pin (analog)
#define WATER_PUMP_PIN 18       // Define water pump control pin
#define DOSING_PUMP_PIN 5      // Define dosing pump control pin

float phValue = 0.0;           // pH value to be read from sensor

void setup() {
  Serial.begin(9600);

  // Initialize sensors and pumps
  pinMode(PH_SENSOR_PIN, INPUT);
  pinMode(WATER_PUMP_PIN, OUTPUT);
  pinMode(DOSING_PUMP_PIN, OUTPUT);
  
  // Ensure both pumps are OFF initially
  digitalWrite(WATER_PUMP_PIN, LOW);
  digitalWrite(DOSING_PUMP_PIN, LOW);
}

void loop() {
  // Read pH level (analog)
  int phValueRaw = analogRead(PH_SENSOR_PIN);
  phValue = (phValueRaw * (14.0 / 4095.0)); // Scale raw value to pH range (0-14)

  // Classify the pH value
  String phClassification = classifyPH(phValue);

  // Print sensor readings
  Serial.print("pH: "); Serial.println(phValue); 
  Serial.print(" - ");
  Serial.println(phClassification); // Print the classification

  // Control pumps based on pH value
  controlPumps(phValue);

  delay(2000); // Adjust delay as per required sampling rate
}

// Function to classify pH value
String classifyPH(float ph) {
  if (ph < 7.0) {
    return "Acidic";
  } else if (ph == 7.0) {
    return "Neutral";
  } else {
    return "Alkaline";
  }
}

// Function to control water and dosing pumps based on pH
void controlPumps(float ph) {
  if (ph < 6.5) {               // If pH is too low (acidic)
    digitalWrite(WATER_PUMP_PIN, HIGH);  // Turn ON water pump to dilute acid
    digitalWrite(DOSING_PUMP_PIN, LOW);  // Turn OFF dosing pump
    Serial.println("Water Pump ON: Increasing pH...");
  } else if (ph > 7.5) {        // If pH is too high (alkaline)
    digitalWrite(DOSING_PUMP_PIN, HIGH); // Turn ON dosing pump to add solution
    digitalWrite(WATER_PUMP_PIN, LOW);   // Turn OFF water pump
    Serial.println("Dosing Pump ON: Decreasing pH...");
  } else {                      // If pH is within the desired range
    digitalWrite(WATER_PUMP_PIN, LOW);   // Turn OFF water pump
    digitalWrite(DOSING_PUMP_PIN, LOW);  // Turn OFF dosing pump
    Serial.println("pH is within optimal range. Pumps OFF.");
  }
}