diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3483249..d10acf6 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -5,7 +5,8 @@
         "stdlib.h": "c",
         "errno.h": "c",
         "rfid_handler.h": "c",
-        "fcntl.h": "c"
+        "fcntl.h": "c",
+        "file_operations.h": "c"
     },
     "C_Cpp.errorSquiggles": "enabled"
 }
\ No newline at end of file
diff --git a/include/main.h b/include/main.h
new file mode 100644
index 0000000..f945549
--- /dev/null
+++ b/include/main.h
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#ifndef __MAIN_H__
+#define __MAIN_H__
+
+#define TRUE 1
+#define FALSE 0
+#define BYTE uint8_t
+#define MIN_X_TERMINAL_SIZE 80
+#define MIN_Y_TERMINAL_SIZE 30
+
+int main(int argc, char const **argv);
+
+#endif
\ No newline at end of file
diff --git a/include/tui.h b/include/tui.h
index 457fb9f..05c926f 100644
--- a/include/tui.h
+++ b/include/tui.h
@@ -4,9 +4,8 @@
 #include <ncurses.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include "main.h"
 
-#define MIN_X_TERMINAL_SIZE 80
-#define MIN_Y_TERMINAL_SIZE 30
 
 void uartDialog(char *uart_adress, int terminal_x, int terminal_y);
 
diff --git a/include/users.h b/include/users.h
index 39ac006..9305191 100644
--- a/include/users.h
+++ b/include/users.h
@@ -1,3 +1,5 @@
+#include "main.h"
+
 #include <stdint.h>
 #include <time.h>
 #include <unistd.h>
@@ -15,7 +17,9 @@ typedef struct person
     uint32_t department;
 
     time_t last_time_event;
-    uint32_t total;
+    time_t total;
+
+    BYTE available;
 
     pthread_mutex_t lock;
 } person_t;
@@ -40,7 +44,18 @@ uint16_t generateUUID(node_t *_head);
 
 uint16_t searchUUIDByName(node_t *_head);
 
-node_t *searchPersonByUUID(node_t *_head);
+/**
+ * @brief Searches for a person in a linked list by their UUID.
+ *
+ * This function traverses a linked list starting from the given head node
+ * and searches for a node that matches the specified UUID.
+ *
+ * @param _head Pointer to the head node of the linked list.
+ * @param _uuid The UUID of the person to search for.
+ * @return Pointer to the node containing the person with the matching UUID,
+ *         or NULL if no such person is found.
+ */
+node_t *searchPersonByUUID(node_t *_head, uint16_t _uuid);
 
 /**
  * @brief Adds a new person to the linked list.
diff --git a/output/main b/output/main
deleted file mode 100755
index 4680260..0000000
Binary files a/output/main and /dev/null differ
diff --git a/src/main.c b/src/main.c
index 7295927..f0faee3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -12,6 +12,7 @@
 #include "tui.h"
 #include "rfid_handler.h"
 #include "file_operations.h"
+#include "main.h"
 
 int main(int argc, char const **argv)
 {
diff --git a/src/rfid_handler.c b/src/rfid_handler.c
index 277c7d7..62eea72 100644
--- a/src/rfid_handler.c
+++ b/src/rfid_handler.c
@@ -1,5 +1,6 @@
 #include "rfid_handler.h"
 #include "users.h"
+#include "main.h"
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/src/tui.c b/src/tui.c
index cd5bf2b..63f52d6 100644
--- a/src/tui.c
+++ b/src/tui.c
@@ -2,6 +2,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include "main.h"
+
 
 void uartDialog(char *uart_adress, int terminal_x, int terminal_y)
 {
diff --git a/src/users.c b/src/users.c
index 7b11b0f..3a5db1f 100644
--- a/src/users.c
+++ b/src/users.c
@@ -1,4 +1,6 @@
 #include "users.h"
+#include "main.h"
+
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -31,6 +33,24 @@ uint16_t generateUUID
     return uuid;
 }
 
+node_t *searchPersonByUUID
+(
+    node_t *_head,
+    uint16_t _uuid
+)
+{
+    node_t *current = _head;
+    while (current != NULL)
+    {
+        if (current->user.uuid == _uuid)
+        {
+            return current;
+        }
+        current = current->next;
+    }
+    return NULL;
+};
+
 int addPersonToList
 (
     node_t **_head,
@@ -67,6 +87,7 @@ int addPersonToList
     new_node->user.department = _department;
     new_node->user.last_time_event = -255;
     new_node->user.total = 0;
+    new_node->user.available = FALSE;
 
     new_node->next = NULL;
 
@@ -83,5 +104,28 @@ int addPersonToList
     }
     current->next = new_node;
 
+    return 1;
+}
+
+int addTimeEvent
+(
+    node_t *_person
+)
+{
+    time_t current_time = time(0);
+
+    if (_person == NULL)
+    {
+        return 0;
+    }
+
+    if (_person->user.available)
+    {
+        _person->user.total += (current_time - _person->user.last_time_event);
+    }
+
+    _person->user.available = !_person->user.available;  
+    _person->user.last_time_event = current_time;  
+
     return 1;
 }
\ No newline at end of file