// Define GPIO pins
const int pebbleSandPin = 22;   // for pebble and sand detection
const int waterLevelPin = A0;  //  pin for water level sensor
const int pHLevelPin = 25;      //  pin for pH level sensor
const int aquaPin = 5;         //  pin connected to the Aqua system
const int lightPin = 32;        // pin connected to the Light system

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

  // Set pinMode for Aqua and Light systems
  pinMode(aquaPin, OUTPUT);
  pinMode(lightPin, OUTPUT);
}

void loop() {
  // Read sensor values
  int pebbleSand = digitalRead(pebbleSandPin);
  int waterLevel = analogRead(waterLevelPin);
  int pHLevel = analogRead(pHLevelPin);

  // Print sensor values 
  Serial.print("Pebble and Sand: ");
  Serial.print(pebbleSand);
  Serial.print(", Water Level: ");
  Serial.print(waterLevel);
  Serial.print(", pH Level: ");
  Serial.println(pHLevel);

  // Condition 1: Pebble and sand detected, low water level, pH less than 7
  if (pebbleSand && (waterLevel < 200) && (pHLevel < 7)) {
    digitalWrite(aquaPin, HIGH);  // Turn on Aqua
    digitalWrite(lightPin, LOW); // Turn on Light
  }
  // Condition 2: Pebble and sand undetected, low water level, pH more or equal to 7
  else if (!pebbleSand && (waterLevel < 200) && (pHLevel >= 700)) {
    digitalWrite(aquaPin, HIGH);  // Turn on Aqua
    digitalWrite(lightPin, LOW);  // Turn off Light
  }
  // Condition 3: pH less than 7, pebble and sand undetected
  else if ((pHLevel < 700) && !pebbleSand) {
    digitalWrite(aquaPin, LOW);   // Turn off Aqua
    // Blink the light LED
    digitalWrite(lightPin, HIGH);
    delay(500);  
    digitalWrite(lightPin, LOW);
    delay(500);  
  }
  // Condition 4: Low water level, pH more or equal to 7
  else if ((waterLevel < 200) && (pHLevel >= 700)) {
    digitalWrite(aquaPin, HIGH);  // Turn on Aqua
    digitalWrite(lightPin, LOW);  // Turn off Light
  }
  // Condition 5: Pebble and sand undetected, water level is overflow, pH more or equal to 7
  else if (!pebbleSand && (waterLevel >= 900) && (pHLevel >= 700)) {
    digitalWrite(aquaPin, LOW);   // Turn off Aqua
    digitalWrite(lightPin, LOW);  // Turn off Light
  }
  
  // Blink the light LED
  digitalWrite(lightPin, HIGH);
  delay(500);  // Adjust delay duration as needed
  digitalWrite(lightPin, LOW);
  delay(500);  // Adjust delay duration as needed
  
 
  // Delay for stability 
  //delay(500);
}