#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int trigPin = 5;
const int echoPin = 18;

const int highLED = 25;
const int midLED = 26;
const int lowLED = 27;

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup(){
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

pinMode(lowLED, OUTPUT);
pinMode(midLED, OUTPUT);
pinMode(highLED, OUTPUT);

lcd.init();
lcd.backlight();
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);

  float distance = (duration * 0.0343) / 2;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Nivel de agua: ");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm ");

  if (distance <=150) {
    digitalWrite(lowLED, LOW);
    digitalWrite(midLED, LOW);
    digitalWrite(highLED, HIGH);
    lcd.setCursor(15, 0);
    lcd.print("ALTO");
  } else if (distance > 150 && distance <= 300) {
    digitalWrite(lowLED, LOW);
    digitalWrite(midLED, HIGH);
    digitalWrite(highLED, LOW);
    lcd.setCursor(15, 0);
    lcd.print("MEDIO");
  } else if (distance > 300 && distance <= 405) {
    digitalWrite(lowLED, HIGH);
    digitalWrite(midLED,  LOW);
    digitalWrite(highLED, LOW);
    lcd.setCursor(15, 0);
    lcd.print("BAJO");
  }
  delay (1000);
}