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


LiquidCrystal_I2C lcd(0x27, 16, 2);


const int trigPins[4] = {5, 11, 9, 7};
const int echoPins[4] = {8, 4, 6, 10};


const int greenLEDs[4] = {2, 3, 12, 13};
const int redLEDs[4] = {A0, A1, A2, A3};


long duration;
int distance[4];

void setup() {
 
  lcd.begin(16,2);
  lcd.backlight();
  
 
  for (int i = 0; i < 4; i++) {
    pinMode(trigPins[i], OUTPUT);
    pinMode(echoPins[i], INPUT);
    pinMode(greenLEDs[i], OUTPUT);
    pinMode(redLEDs[i], OUTPUT);
  }
  
 
  lcd.setCursor(0, 0);
  lcd.print("Estacionamento");
  delay(2000);
  lcd.clear();
}

void loop() {
  for (int i = 0; i < 4; i++) {
   
    digitalWrite(trigPins[i], LOW);
    delayMicroseconds(2);
    digitalWrite(trigPins[i], HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPins[i], LOW);
    
   
    duration = pulseIn(echoPins[i], HIGH);
    
   
    distance[i] = duration * 0.034 / 2;
    
    
    if (distance[i] <= 10) {
      digitalWrite(greenLEDs[i], LOW);
      digitalWrite(redLEDs[i], HIGH);
    } else {
      digitalWrite(greenLEDs[i], HIGH);
      digitalWrite(redLEDs[i], LOW);
    }
  }
  

  lcd.setCursor(0, 0);
  lcd.print("Vagas: ");
  for (int i = 0; i < 4; i++) {
    lcd.print(i + 1);
    if (distance[i] <= 10) {
      lcd.print("O ");
    } else {
      lcd.print("L ");  // L = Livre
    }
  }
  
  delay(1000);
}