CONSTRUCTION OF A CONTACTLESS KEY CARD ACCESS CONTROL SYSTEM USING A RADIO FREQUENCY IDENTIFICATION (RFID) SCANNER AND ARDUINO

Security is needed more and becoming more important in today's world. Sometimes, physical security and access control is not always the best solution, especially in instances with large crowd or systems that requires round-the-clock security. For this reason, an Arduino-based access control system using RFID (Radio Frequency Identification Technology) was created to provide security and access control to buildings and physical spaces, and this eliminated the need for physical security at all times. The device makes use of RFID technology and Arduino to complete its work. RFID (Radio Frequency Identification) is a communication technology commonly known as electronic tags. Radio transmissions can identify targets and transfer data without direct communication. Advancements in radio frequency recognition technology have led to its widespread usage in identity documents, defense, and industrial control. When the RFID scanner recognizes a tag, it checks its UID to the stored database to ensure accuracy. Access is granted if the captured user's UID matches a previously saved UID; otherwise, access is denied.