const int waterQualitySensorPin = A0; 
const int ledPin = 13;                

void setup()
 {
  Serial.begin(9600);
  pinMode(waterQualitySensorPin, INPUT);
  pinMode(ledPin, OUTPUT);
}
void loop() 
{
  int waterQuality = getWaterQuality();

  Serial.print("Water Quality: ");
  Serial.println(waterQuality);
  
  if (waterQuality > 500) { 
    digitalWrite(ledPin, HIGH);
  } 
  else {
    digitalWrite(ledPin, LOW);
  }
  delay(1000);
}
int getWaterQuality()
 {
  return random(0, 1023); 
}