The increasing demand for secure and efficient access management in residential complexes, institutional premises, industrial facilities, and parking areas has encouraged the development of low-cost automated barricading systems. This paper presents the design and implementation of an Arduino-based automated barricading and intelligent access-control system. The proposed system combines radio-frequency identification (RFID) for user authentication, ultrasonic sensors for vehicle detection and obstacle monitoring, a servomotor-driven barrier mechanism, and a liquid-crystal display for system-status indication. An Arduino Uno based on the ATmega328P microcontroller coordinates the sensing, authentication, decision-making, and actuation processes. A finite-state-machine control algorithm is implemented to manage system states, including idle, authentication, barrier opening, vehicle passage, barrier closing, and fault conditions. The proposed design emphasizes affordability, modularity, ease of maintenance, and operational safety. Prototype testing demonstrates that the system can authenticate registered RFID cards, operate the barricade automatically, and prevent barrier closure when an obstacle is detected. The system is suitable for small-scale access-control applications and can be extended through wireless communication, license-plate recognition, cloud logging, and mobile-based authorization.