// Exercício 6
// Breno Correia Lociks

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#define PIN_ECHO 2
#define PIN_TRIG 3
#define BOMBA_AGUA 4

unsigned long millisAnteriorLCD = 0;

int telaAtual = 0;

char status = false;

void setup() {
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(BOMBA_AGUA, OUTPUT);

  lcd.init();
  lcd.setBacklight(HIGH);
}

void loop() {

  unsigned long millisAtual = millis();

  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  int duration = pulseIn(PIN_ECHO, HIGH);

  int distCM = duration / 58;

  if(distCM >= 95){
    digitalWrite(BOMBA_AGUA, HIGH);
    status = true;
  }
  if(distCM <= 12){
    digitalWrite(BOMBA_AGUA, LOW);
    status = false;
  }

  unsigned long VolMed = map(distCM, 95, 12, 18240, 123088);

  if((millisAtual - millisAnteriorLCD) > 2000){
    millisAnteriorLCD = millisAtual;
    
    if(telaAtual == 0){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("V.Max=123088cm3");
      lcd.setCursor(0,1);
      lcd.print("V.Min=18240cm3");

      telaAtual = 1;  
    } 

    else if(telaAtual == 1){
      lcd.clear();

      lcd.setCursor(0,0);
      lcd.print("V.Med=");
      lcd.print(VolMed);
      lcd.print("cm3");

      if(status == false){
        lcd.setCursor(0,1);
        lcd.print("Bomba desligada");
      }
      if(status == true){
        lcd.setCursor(0,1);
        lcd.print("Bomba ligada");
      }

      telaAtual = 0;
    }
  }
}