diff --git a/ProgramArduino/coding.ino b/ProgramArduino/coding.ino
new file mode 100644
index 0000000..8be831c
--- /dev/null
+++ b/ProgramArduino/coding.ino
@@ -0,0 +1,249 @@
+#include <SPI.h>
+#include <MFRC522.h>
+#include <TinyGPS++.h>
+#include <TinyGsmClient.h>
+#include <ArduinoHttpClient.h>
+#include <ArduinoJson.h>
+#include <math.h>
+
+const char FIREBASE_HOST[]  = "sistem-keamanan-c9565-default-rtdb.firebaseio.com";
+const String FIREBASE_AUTH  = "m34dRlGN86G2xllAm197fVt8VhPj4dfQxKGejjnz";
+const int SSL_PORT          = 443;
+const String GPS_PATH       = "/gps";
+const String RELAY_PATH     = "/relay";
+
+char apn[]  = "internet";
+char user[] = "";
+char pass[] = "";
+
+#define rxPin 4
+#define txPin 2
+HardwareSerial sim800(1);
+TinyGsm modem(sim800);
+
+#define RXD2 16
+#define TXD2 17
+HardwareSerial neogps(2);
+TinyGPSPlus gps;
+
+TinyGsmClientSecure gsm_client_secure_modem(modem, 0);
+HttpClient http_client = HttpClient(gsm_client_secure_modem, FIREBASE_HOST, SSL_PORT);
+
+unsigned long previousMillis = 0;
+const long interval = 10000; // Interval hanya untuk relay
+
+#define RELAY_PIN 5
+#define RST_PIN 22
+#define SS_PIN 21
+MFRC522 rfid(SS_PIN, RST_PIN);
+
+#define BUZZER_PIN 15
+
+bool relayState = false;
+
+String registeredRFID[] = {"BEC1596E", "23C13394", "73BE3A1C"};
+
+double prevLatitude = 0.0;
+double prevLongitude = 0.0;
+const double DISTANCE_THRESHOLD = 10.0; // 10 meter
+#define EARTH_RADIUS 6371e3
+
+void setup() {
+  Serial.begin(115200);
+  SPI.begin();
+  rfid.PCD_Init();
+  
+  sim800.begin(9600, SERIAL_8N1, rxPin, txPin);
+  
+  neogps.begin(9600, SERIAL_8N1, RXD2, TXD2);
+  delay(3000);
+
+  pinMode(RELAY_PIN, OUTPUT);
+  digitalWrite(RELAY_PIN, HIGH); // Memastikan relay dalam keadaan Normally Closed (NC)
+  
+  pinMode(BUZZER_PIN, OUTPUT);
+  digitalWrite(BUZZER_PIN, LOW); // Memastikan buzzer mati
+
+  modem.restart();
+  String modemInfo = modem.getModemInfo();
+  
+  connectToInternet();
+  
+  http_client.setHttpResponseTimeout(90 * 1000); // Timeout 90 detik
+}
+
+void loop() {
+  if (!modem.isNetworkConnected()) {
+    connectToInternet();
+  }
+
+  // Tangani permintaan HTTP untuk relay secara berkala
+  unsigned long currentMillis = millis();
+  if (currentMillis - previousMillis >= interval) {
+    previousMillis = currentMillis;
+
+    bool newRelayState = relayState;
+    if (GetRelayStateFromFirebase(&http_client, newRelayState) && newRelayState != relayState) {
+      updateRelayState(newRelayState);
+    }
+  }
+      gps_loop();
+
+  // Selalu cek kartu RFID
+  rfid_loop();
+}
+
+void connectToInternet() {
+  int retry_count = 0;
+  const int max_retries = 5;
+
+  while (retry_count < max_retries) {
+    if (modem.gprsConnect(apn, user, pass)) {
+      return;
+    } else {
+      retry_count++;
+      delay(2000); // Tunggu sebelum mencoba lagi
+    }
+  }
+}
+
+void PostToFirebase(const char* method, const String & path, const String & data, HttpClient* http) {
+  String response;
+  int statusCode = 0;
+  http->connectionKeepAlive(); // Saat ini diperlukan untuk HTTPS
+  
+  String url;
+  if (path[0] != '/') {
+    url = "/";
+  }
+  url += path + ".json";
+  url += "?auth=" + FIREBASE_AUTH;
+  
+  String contentType = "application/json";
+  http->put(url, contentType, data);
+  
+  statusCode = http->responseStatusCode();
+  response = http->responseBody();
+
+  if (!http->connected()) {
+    http->stop(); // Matikan
+    if (!modem.isNetworkConnected()) {
+      connectToInternet();
+    }
+  }
+}
+
+bool GetRelayStateFromFirebase(HttpClient* http, bool &relayState) {
+  String url = String(RELAY_PATH) + ".json?auth=" + FIREBASE_AUTH;
+  
+  http->get(url);
+  int statusCode = http->responseStatusCode();
+  String response = http->responseBody();
+
+  if (statusCode == 200) {
+    DynamicJsonDocument doc(1024);
+    deserializeJson(doc, response);
+    relayState = doc["relayState"];
+    return true;
+  } else {
+    if (!http->connected()) {
+      connectToInternet();
+    }
+  }
+  
+  return false;
+}
+
+void gps_loop() {
+  boolean newData = false;
+  for (unsigned long start = millis(); millis() - start < 2000; ) {
+    while (neogps.available()) {
+      if (gps.encode(neogps.read())) {
+        newData = true;
+        break;
+      }
+    }
+  }
+
+  if (newData) {
+    double currentLat = gps.location.lat();
+    double currentLng = gps.location.lng();
+
+    double distance = haversineDistance(prevLatitude, prevLongitude, currentLat, currentLng);
+
+    if (distance >= DISTANCE_THRESHOLD) {
+      String latitude = String(currentLat, 6);
+      String longitude = String(currentLng, 6);
+
+      String gpsData = "{";
+      gpsData += "\"lat\":" + latitude + ",";
+      gpsData += "\"lng\":" + longitude + "";
+      gpsData += "}";
+
+      PostToFirebase("PATCH", GPS_PATH, gpsData, &http_client);
+
+      prevLatitude = currentLat;
+      prevLongitude = currentLng;
+    }
+  }
+}
+
+void rfid_loop() {
+  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) {
+    return;
+  }
+
+  String rfidTag = "";
+  for (byte i = 0; i < rfid.uid.size; i++) {
+    rfidTag += String(rfid.uid.uidByte[i], HEX);
+  }
+  rfidTag.toUpperCase();
+
+  for (String id : registeredRFID) {
+    if (rfidTag == id) {
+      bool newRelayState = !relayState;
+      updateRelayState(newRelayState);
+      break;
+    }
+  }
+}
+
+void updateRelayState(bool newRelayState) {
+  relayState = newRelayState;
+
+  if (relayState) {
+    buzz(2, 200);
+  } else {
+    buzz(1, 200);
+  }
+
+  digitalWrite(RELAY_PIN, relayState ? LOW : HIGH);
+
+  String relayData = "{";
+  relayData += "\"relayState\":" + String(relayState ? "true" : "false");
+  relayData += "}";
+
+  PostToFirebase("PATCH", RELAY_PATH, relayData, &http_client);
+}
+
+void buzz(int count, int delayTime) {
+  for (int i = 0; i < count; i++) {
+    digitalWrite(BUZZER_PIN, HIGH);
+    delay(delayTime);
+    digitalWrite(BUZZER_PIN, LOW);
+    delay(delayTime);
+  }
+}
+
+double haversineDistance(double lat1, double lon1, double lat2, double lon2) {
+  double lat1Rad = radians(lat1);
+  double lat2Rad = radians(lat2);
+  double deltaLat = radians(lat2 - lat1);
+  double deltaLon = radians(lon2 - lon1);
+
+  double a = sin(deltaLat / 2) * sin(deltaLat / 2) +
+             cos(lat1Rad) * cos(lat2Rad) * sin(deltaLon / 2) * sin(deltaLon / 2);
+  double c = 2 * atan2(sqrt(a), sqrt(1 - a));
+
+  return EARTH_RADIUS * c;
+}