Accurate real-time tracking of human occupancy is essential for intelligent building management, automated energy conservation, and safety regulation compliance. This paper presents the design, interfacing, and experimental validation of a low-power, automated bidirectional visitor counter. The system integrates dual infrared (IR) beam-break sensors, an ultra-low-power microcontroller, and an energy-efficient liquid crystal display (LCD). By implementing a non-blocking, interrupt-driven finite state machine, the architecture decodes passage sequence vectors to reliably differentiate between entry and exit events while preventing false counts caused by tailgating, partial occlusion, or jitter. Experimental evaluations across single-file transit, rapid bi-directional flow, and edge obstruction scenarios demonstrate high counting precision and significant power optimization.