Security of Surveillance Systems (Presence & Motion Sensors)

The HW-416-B is a passive infrared (PIR) motion sensor module built around the signal processing IC. It is designed for Arduino, Raspberry Pi, ESP32, and other microcontroller (MCU) or relay-based projects. Typical applications include automatic lighting, security alarms, human-activated displays, and energy-saving systems.

The (often cross-referenced with the HC-SR501 ) is a pyroelectric infrared motion sensor module designed for automatic human body detection. It is widely used in smart home lighting, security systems, and industrial automation due to its adjustable sensitivity and low power consumption. Core Specifications

HW-416-B is nearly identical to HC-SR501 but slightly wider voltage tolerance. It’s better than AM312 for adjustable timing, worse for ultra-compact designs.