Implementasi Sistem Presensi Jemaat GSJK Berbasis RFID dengan Notifikasi Telegram

Abstract

The manual attendance recording in church congregations often causes inefficiency, long queues, and high risk of data loss or human error. This study aims to design and implement an automated attendance system based on Radio Frequency Identification (RFID) integrated with real-time Telegram notifications for the GSJK Tlogosari Congregation in Semarang. The Research and Development (R&D) method was used, involving hardware design using an ESP32 microcontroller, RC522 RFID module, LCD, LEDs, and buzzer, as well as software development using the Arduino IDE and Telegram Bot API. Black Box testing was conducted to verify the functional aspects, reading distance, and notification delivery speed. The results indicate that the system operates successfully with high accuracy. The "tap-and-go" mechanism effectively reduces the attendance process time to 2–3 seconds per member, significantly faster than the previous manual method. The Telegram Bot API successfully sends real-time attendance notifications to the church administrators, while the local feedback indicators (LED, Buzzer, LCD) provide clear validation for the congregation. The system is highly dependent on Wi-Fi stability; however, it has proven to be an effective solution for modernizing church administrative services based on Internet of Things (IoT) technology.