// Define constants for sensor pins
const int waterLevelSensorPin = A0;   // Analog input pin for water level sensor
const int temperatureSensorPin = A1;  // Analog input pin for temperature sensor
const int pumpControlPin = 2;         // Digital output pin for controlling MOSFET (water pump)

// Define constants for LED pins
const int greenLEDPin = 3;   // Green LED pin
const int yellowLEDPin = 4;  // Yellow LED pin
const int redLEDPin = 5;     // Red LED pin

// Define thresholds for water level and temperature
const int fullTankThreshold = 5000;    // Above 4500 liters is considered full (analog value)
const int refillThresholdLow = 2000;   // Below 2000 liters is considered low (analog value)
const int refillThresholdHigh = 4500;  // Between 2000 and 4500 liters is considered refill (analog value)
const int pumpStartThreshold = 1500;   // Pump starts when water level is above 1500 liters (analog value)
const int temperatureThreshold = 65;   // Temperature threshold in Celsius

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

  // Set pin modes for LEDs
  pinMode(greenLEDPin, OUTPUT);
  pinMode(yellowLEDPin, OUTPUT);
  pinMode(redLEDPin, OUTPUT);

  // Set pin mode for pump control
  pinMode(pumpControlPin, OUTPUT);
}

void loop() {
  // Read analog values from sensors
  int waterLevel = analogRead(waterLevelSensorPin);    // Read water level sensor
  int temperature = analogRead(temperatureSensorPin);  // Read temperature sensor

  // Convert analog readings to actual quantities or temperatures
  int waterQuantityLiters = map(waterLevel, 0, 1023, 0, 10000);  // Map analog value to liters (0-10000)

  // Check water level and control LEDs
  if (waterQuantityLiters >= refillThresholdHigh) {
    digitalWrite(greenLEDPin, HIGH);  // Green LED (Full tank)
    digitalWrite(yellowLEDPin, LOW);  // Yellow LED (Refill) off
    digitalWrite(redLEDPin, LOW);     // Red LED (Empty) off
  } else if (waterQuantityLiters >= refillThresholdLow && waterQuantityLiters < refillThresholdHigh) {
    digitalWrite(greenLEDPin, LOW);
    digitalWrite(yellowLEDPin, HIGH);
    digitalWrite(redLEDPin, LOW);
  } else {
    digitalWrite(greenLEDPin, LOW);
    digitalWrite(yellowLEDPin, LOW);
    digitalWrite(redLEDPin, HIGH);
  }

  // Check water level to control pump
  if (waterQuantityLiters > pumpStartThreshold) {
    digitalWrite(pumpControlPin, HIGH);  // Turn on pump
  } else {
    digitalWrite(pumpControlPin, LOW);  // Turn off pump
  }

  // Check temperature to control heater element (assuming heater logic is implemented separately)

  // Debugging output (optional)
  Serial.print("Water Level (liters): ");
  Serial.println(waterQuantityLiters);
  Serial.print("Temperature (Celsius): ");
  Serial.println(map(temperature, 0, 1023, 0, 100));  // Map temperature analog value to Celsius

  // Add delay to prevent continuous looping too fast (adjust as needed)
  delay(3000);  // Delay of 1 second (3000 milliseconds)
}