#define FLOW_SENSOR_PIN 4   // Flow meter signal pin
#define POTENTIOMETER_PIN 34 // Potentiometer analog pin

volatile int pulseCount = 0; // To store pulse count
float flowRate = 0.0;        // Flow rate in liters per minute
float totalVolume = 0.0;     // Total volume in liters
unsigned long oldTime = 0;

// Interrupt Service Routine for counting flow meter pulses
void IRAM_ATTR countPulse() {
  pulseCount++;
}

void setup() {
  Serial.begin(115200);

  // Configure pins
  pinMode(FLOW_SENSOR_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(FLOW_SENSOR_PIN), countPulse, RISING);

  analogReadResolution(12); // ESP32 analog resolution (0-4095)
  pinMode(POTENTIOMETER_PIN, INPUT);

  Serial.println("Water Flow");
}

void loop() {
  // Calculate flow rate
  unsigned long currentTime = millis();
  unsigned long timeInterval = currentTime - oldTime;

  if (timeInterval > 1000) { // Calculate every second
    // Calculate flow rate in liters per minute
    flowRate = (pulseCount / 7.5) / (timeInterval / 1000.0); // Formula depends on flow meter specs
    pulseCount = 0; // Reset pulse count
    oldTime = currentTime;

    // Add to total volume
    totalVolume += (flowRate / 60.0); // Convert minutes to seconds

    // Read potentiometer value
    int potValue = analogRead(POTENTIOMETER_PIN); // Read potentiometer (0-4095)
    float setFlow = map(potValue, 0, 4095, 0, 10); // Map to a Set Value for flow rate (0-10 L/min)

    // Output flow information
    Serial.print("Set Value: ");
    Serial.print(setFlow);
    Serial.print(" L/min, ");

    Serial.print("Flow Rate: ");
    Serial.print(flowRate);
    Serial.print(" L/min, ");

    Serial.print("Total Volume: ");
    Serial.print(totalVolume);
    Serial.println(" L");
    

    // Simulate flow adjustment (e.g., using PWM for a water pump)
    adjustWaterFlow(setFlow);
  }
}

void adjustWaterFlow(float setFlow) {
  // Simulate adjustment using Set Value for flow rate
  // Example: Generate PWM signal to control a water pump
  int pwmValue = map(setFlow, 0, 10, 0, 255); // Map Set Value for flow to PWM range
  analogWrite(25, pwmValue); // Send PWM signal on pin 25
}