#define PIN_TRIG 26
#define PIN_ECHO 25
#define HIGHLED  21
#define MIDLED  5
#define LOWLED  4
#define MOTOR 13

unsigned int level = 0;

void setup() {

  pinMode(LOWLED, OUTPUT);
  pinMode(MIDLED, OUTPUT);
  pinMode(HIGHLED, OUTPUT);
  pinMode(MOTOR, OUTPUT);

  digitalWrite(LOWLED, HIGH);
  digitalWrite(MIDLED, HIGH);
  digitalWrite(HIGHLED, HIGH);
  digitalWrite(MOTOR, LOW);

  Serial.begin(115200);

  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
}

void loop() {
  
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  // Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);
  Serial.print("Distance in inches: ");
  Serial.println(duration / 148);

  //Sensing water levels in cm
  level = duration / 58;

 // if level less than 100
 //level is LOW
 //start the motor for the water pump

  if (level < 100){
  //indicate low level condition
digitalWrite(LOWLED,LOW);
digitalWrite(MOTOR, HIGH);
digitalWrite(HIGHLED,HIGH);
digitalWrite(MIDLED,HIGH);

  }else if ((level > 200) && (level < 400)){

digitalWrite(LOWLED,HIGH);
digitalWrite(HIGHLED,HIGH);
digitalWrite(MIDLED,LOW);

}else if (level >= 400 )
  {
        digitalWrite(HIGHLED,LOW);
        digitalWrite(MIDLED,HIGH);
        digitalWrite(LOWLED,HIGH);
        digitalWrite(MOTOR,LOW);

  }
  delay(1000);
}