#include <LiquidCrystal_I2C.h>
#define PIN_TRIG 26
#define PIN_ECHO 25
#define LOWLED   18
#define MIDLED   19 
#define HIGHLED  21
#define MOTOR    5

// declare the variable 'level'
unsigned int level = 0;
LiquidCrystal_I2C lcd(0x27,16,2);
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,HIGH);

  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
}

void loop() {
  // Start a new measurement:
  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);

  level = duration / 58;
  lcd.init();
  lcd.clear();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("WATER TANK LEVEL");

  if (level < 100)
  {
    digitalWrite(LOWLED,HIGH);
    digitalWrite(MOTOR,LOW);
    digitalWrite(HIGHLED,HIGH);
    digitalWrite(MIDLED,HIGH);
    lcd.setCursor(0,1);
    lcd.print("VERY LOW");
  }
  else if (level < 200)  // add parentheses around the '&&' operator
  {
    digitalWrite(MOTOR,HIGH);
    digitalWrite(LOWLED,LOW);
    digitalWrite(HIGHLED,HIGH);
    digitalWrite(MIDLED,HIGH);
    lcd.setCursor(0,1);
    lcd.print("MEDIUM");
  }
  else if  (level < 300)
  {
    digitalWrite(MOTOR,HIGH);
    digitalWrite(LOWLED,HIGH);
    digitalWrite(HIGHLED,HIGH);
    digitalWrite(MIDLED,LOW);
    lcd.setCursor(0,1);
    lcd.print("MEDIUM");
  }
  else if (level <= 400)
  {
    digitalWrite(HIGHLED,LOW);
    digitalWrite(MIDLED,HIGH);
    digitalWrite(LOWLED,HIGH);
    digitalWrite(MOTOR,HIGH);
    lcd.setCursor(0,1);
    lcd.print("HIGH");

  }

  delay(1000);
}