The pedestrian sensor is a device designed to monitor pedestrian flows in a non-intrusive and privacy-preserving manner. It is battery-powered and combines passive infrared (PIR) sensing with active infrared (AIR) beam detection to accurately count individuals and determine movement direction, activating higher-power components only when motion is detected to maximise energy efficiency. The sensor performs local processing and periodically transmits aggregated counts through flexible multi-RAN communication options, such as Wi-Fi or LoRaWAN, enabling reliable operation in both indoor and outdoor environments, including locations with limited infrastructure. This hybrid approach provides a practical and low-cost solution for real-time pedestrian flow monitoring in smart city and event scenarios