diff --git a/code/LCDScreen.cpp b/code/LCDScreen.cpp
index ecdc9bb..7f5430f 100644
--- a/code/LCDScreen.cpp
+++ b/code/LCDScreen.cpp
@@ -4,6 +4,7 @@
 enum LCDScreenState {
     DISPLAY_DEFAULT_MESSAGE,
     DISPLAY_TEMPERATURE,
+    DISPLAY_PARKING_SPOTS_FULL,
     DISPLAY_PARKING_SPOTS
 };
 
@@ -46,4 +47,18 @@ class LCDScreen {
             lcd.print(this->default_message);
         }
 
+        void display_message_full(){
+            this->state = DISPLAY_PARKING_SPOTS_FULL;
+            lcd.setCursor(0, 0);
+            this->clear();
+            lcd.print("Parking Lot is FULL.\nPlease come back later.\n");
+        }
+
+        void display_message(int slots){
+            this->state = DISPLAY_PARKING_SPOTS;
+            lcd.setCursor(0, 0);
+            this->clear();
+            lcd.print("Available slots: ");
+            lcd.print(slots); lcd.print('\n');
+        }
 };
\ No newline at end of file
diff --git a/code/code.ino b/code/code.ino
index 76306f8..44b560d 100644
--- a/code/code.ino
+++ b/code/code.ino
@@ -6,11 +6,14 @@
 #include "DistSensor.cpp";
 #include "LCDScreen.cpp";
 
+#define PARK_SLOTS = 8;
 #define ULTRASONIC_SENSOR_PIN_TRIG 11
 #define ULTRASONIC_SENSOR_PIN_ECHO 12
 #define SERVO_PIN 10
 #define SERVO_PIN 10
 #define TEMP_SENSOR_PIN 9
+#define BUTTON_PIN = 8;
+#define BUZZER_PIN = 3;
 
 OneWire oneWire(TEMP_SENSOR_PIN);
 DallasTemperature sensors(&oneWire);
@@ -20,6 +23,7 @@ Barrier barrier = Barrier(SERVO_PIN, 3);
 LCDScreen screen = LCDScreen();
 
 unsigned long current_time, sensor_last_time_activated, temperature_last_time_measured;
+int OCCUPIED_SLOTS = 0, Button_State = 0, Last_Button_State = 0;
 
 void setup() {
     Serial.begin(9600);
@@ -27,31 +31,57 @@ void setup() {
     barrier.configure_pins();
     sensors.begin();
     screen.init();
-
+    pinMode(BUTTON_PIN, INPUT);
+    pinMode(BUZZER_PIN, OUTPUT);
 }
 
 void loop() {
 
     current_time = millis();
+    Button_State = digitalRead(BUTTON_PIN);
 
+    // Carro entra:
     if (dist_sensor.is_in_range()){ 
-        sensor_last_time_activated = current_time;
+        sensor_last_time_activated_IN = current_time;
         if(barrier.is_closed()){
             barrier.open();
         }
     } else if (!dist_sensor.is_in_range() && barrier.is_open()){
-        if (current_time - sensor_last_time_activated >= barrier.open_time_seconds * 1000){
+        if (current_time - sensor_last_time_activated_IN >= barrier.open_time_seconds * 1000){
+            barrier.close();
+            OCCUPIED_SLOTS++;
+        }
+    }
+    
+    // Carro sai:
+    if (Button_State != Last_Button_State){ 
+        sensor_last_time_activated_OUT = current_time;
+        if(barrier.is_closed()){
+            barrier.open();
+            if (Button_State == HIGH) {
+                OCCUPIED_SLOTS--;
+                screen.display_message(OCCUPIED_SLOTS);
+                if (OCCUPIED_SLOTS == PARK_SLOTS) {
+                    screen.display_message_full();
+                    tone(BUZZER_PIN, 1000); delayMicroseconds(500);
+                    noTone(BUZZER_PIN);
+                    tone(BUZZER_PIN, 1000); delayMicroseconds(500);
+                    noTone(BUZZER_PIN);
+                }
+            }
+        }
+    } else if (!dist_sensor.is_in_range() && barrier.is_open()){
+        if (current_time - sensor_last_time_activated_OUT >= barrier.open_time_seconds * 1000){
             barrier.close();
         }
     }
+    Last_Button_State = Button_State;
 
+    // Temperatura:
     if (current_time - temperature_last_time_measured >= 1000){
         temperature_last_time_measured = current_time;
         sensors.requestTemperatures();
         float tempC = sensors.getTempCByIndex(0);
         screen.display_temperature(tempC);
     }
-
-
-     
 }