const int PH_PIN = 34;    // Pin connected to the pH sensor
const int LED_PIN = 13;   // Pin connected to the LED

const float PH_THRESHOLD = 5.5; // pH value below which the LED should be turned on

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW); // Ensure LED is off initially
}

void loop() {
  // Read the pH sensor value (analog value from 0 to 4095)
  int sensorValue = analogRead(PH_PIN);

  // Convert the sensor value to pH (calibrate this for your specific sensor)
  float pHValue = map(sensorValue, 0, 4095, 0, 14); // Example conversion; adjust as needed

  // Print the pH value for debugging
  Serial.print("pH: ");
  Serial.println(pHValue);

  // Check if the pH level is below the threshold and control LED
  if (pHValue < PH_THRESHOLD) {
    digitalWrite(LED_PIN, HIGH); // Turn on LED if pH is below PH_THRESHOLD
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn off LED if pH is within the acceptable range
  }

  // Wait before the next reading
  delay(2000); // Adjust delay as needed
}