diff --git a/the-cup.ino b/the-cup.ino
index 4f1bbea..4b7cf62 100644
--- a/the-cup.ino
+++ b/the-cup.ino
@@ -34,6 +34,9 @@ MFRC522DriverSPI driver_1{ss_1_pin};
 
 MFRC522 reader{driver_1};   // Create MFRC522 instance.
 
+void read_card(char reader_uid[]);
+void send_uid(char reader_uid[]);
+
 void setup() {
   Serial.begin(115200);
 
@@ -59,40 +62,49 @@ void setup() {
 }
 
 void loop() {
-  auto client = std::make_unique<BearSSL::WiFiClientSecure>();
 
   if (reader.PICC_IsNewCardPresent() && reader.PICC_ReadCardSerial()) {
-    reader.PICC_HaltA();
-    reader.PCD_StopCrypto1();
     char reader_uid[32] = "";
-    byte_to_string(reader.uid.uidByte, 4, reader_uid);
-    Serial.println(reader_uid);
+    read_card(reader_uid);
+    send_uid(reader_uid);
+  }
+}
 
-    client->setInsecure();
-    HTTPClient https;
-    Serial.print("[HTTPS] begin...\n");
-    // configure traged server and url
-    https.begin(*client, "https://mood.robiweb.net/rfid_tags");  // HTTP
-    https.addHeader("Content-Type", "application/json");
+void read_card(char reader_uid[]) {
+  reader.PICC_HaltA();
+  reader.PCD_StopCrypto1();
+  byte_to_string(reader.uid.uidByte, 4, reader_uid);
+  Serial.println(reader_uid);
+}
 
-    // start connection and send HTTP header and body
-    int httpCode = https.POST("{\"identifier\":\"" + String(reader_uid) + "\"}");
-    Serial.print("httpCode: ");
-    Serial.println(httpCode);
-    
-    if (httpCode > 0) {
-      if (httpCode == HTTP_CODE_CREATED) {
-        displaySuccess();
-      } else {
-        displayError();
-      }
+void send_uid(char reader_uid[]) {
+  auto client = std::make_unique<BearSSL::WiFiClientSecure>();
+
+  client->setInsecure();
+  HTTPClient https;
+  Serial.print("[HTTPS] begin...\n");
+  // configure traged server and url
+  https.begin(*client, "https://mood.robiweb.net/rfid_tags");  // HTTP
+  https.addHeader("Content-Type", "application/json");
+
+  // start connection and send HTTP header and body
+  int httpCode = https.POST("{\"identifier\":\"" + String(reader_uid) + "\"}");
+  Serial.print("httpCode: ");
+  Serial.println(httpCode);
+
+  if (httpCode > 0) {
+    if (httpCode == HTTP_CODE_CREATED) {
+      displaySuccess();
     } else {
       displayError();
     }
-
-    https.end();
-    Serial.print("[HTTPS] ended...\n");
+  } else {
+    displayError();
   }
+
+  https.end();
+  Serial.print("[HTTPS] ended...\n");
+
 }
 
 void byte_to_string(byte array[], unsigned int len, char buffer[]) {