#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C LCD( 0x27, 16, 2);

// Definir pinos
#define botup 15
#define botdown 4
#define botsav 16
#define TRIG 27
#define ECHO 26
#define led 17

// Variáveis
int contador = 0;
long duration;
int distance;
int alarme = 0;
bool alarmeAtivo = false;

void setup() {
  Serial.begin(115200);
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Senai CFP 1.01");
  LCD.setCursor(0, 1);
  LCD.print("TEC.MECATRONICA");
  delay(1000);
  LCD.clear();
  pinMode(TRIG, OUTPUT);
  pinMode(ECHO, INPUT);
  pinMode(botup, INPUT_PULLUP);
  pinMode(botdown, INPUT_PULLUP);
  pinMode(botsav, INPUT_PULLUP);
  pinMode(led, OUTPUT);
}

void loop() {
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);
  duration = pulseIn(ECHO, HIGH);
  distance = duration * 0.034 / 2;

  if (digitalRead(botup) == LOW) {
    delay(200);
    alarme += 10;
  }

  if (digitalRead(botdown) == LOW) {
    delay(200);
    alarme -= 10;
  }

  if (digitalRead(botsav) == LOW) {
    delay(200);
    alarmeAtivo = true;
  }

  if (alarmeAtivo) {

    if (distance >= alarme) {
      digitalWrite(led, HIGH);
    } else {
      digitalWrite(led, LOW);
    }
  } else {
    digitalWrite(led, LOW);
  }

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Alarme: ");
  LCD.print(alarme);
  LCD.print(" cm");
  
  LCD.setCursor(0, 1);
  LCD.print("Distancia: ");
  LCD.print(distance);
  LCD.print(" cm");

  delay(200);
}