Physical Science International Journal

Manual operation of barriers at access points can increase operator workload and may delay vehicular movement. This study designed, constructed, and evaluated a remote-controlled gate cross bar intended to provide a low-cost wireless alternative for automated access control. The system integrated an Arduino Uno microcontroller based on the ATmega328P, a 433 MHz radio-frequency transmitter and receiver, a 12 V DC geared motor, a motor-driver module, limit switches, relay control, status indicators, and a mechanical               barrier arm. The control program processed remote commands, activated bidirectional motor movement, and used limit-switch feedback to stop the barrier at the fully open and closed positions. Performance was evaluated under outdoor conditions using 20 opening-and-closing cycles. The measured parameters included response time, opening time, closing time, remote operating range, and operational consistency. The system recorded a mean response time of 0.61 ± 0.05 s, a mean opening time of 2.43 ± 0.08 s, and a mean closing time of 2.48 ± 0.07 s. Stable RF communication was maintained over an average distance of 25 ± 1.2 m. Temporary electromagnetic interference, metallic obstacles, reinforced-concrete walls, and minor power-supply fluctuations affected signal reception or motor speed during some observations. No mechanical  failure, motor overheating, excessive vibration, or structural deformation was reported during testing. The developed prototype demonstrated the practical integration of locally available mechanical and electronic components for wireless gate operation, although further evaluation under broader field conditions is required.