Human Prescence Sensor

Human Prescence Sensor

A human presence sensor is an advanced electronic device that detects whether a person is in a designated space—even when they are completely still, sitting, reading, or sleeping. How It Works • Millimeter-Wave (mmWave) Radar: Most modern units (operating around 24 GHz to 60 GHz) emit low-power radio waves and analyze reflections. • Micro-Doppler Breathing Detection: Unlike older sensors, mmWave radar catches tiny frequency shifts caused by chest movements from human breathing (0.2–0.5 Hz), accurately spotting stationary bodies from 6 to 8 meters away. • Beyond PIR Sensors: Traditional Passive Infrared (PIR) motion sensors only trigger when a person physically walks across their field of view and fail to notice someone sitting quietly at a desk or lying in bed. Key Features & Technology Types • Stationary & Motion Tracking: Differentiates between moving activity and static presence. • Alternative Methods: Some presence-sensing systems utilize low-resolution thermal cameras, audio biometrics, or machine learning models on dedicated camera modules. • Privacy-Friendly: Radar and infrared solutions detect human form or breathing without recording video or compromising personal privacy. • Smart Home & Industrial Integration: Frequently paired with protocols like Zigbee or microcontrollers (such as ESP32) to automate lighting, climate control, security systems, and healthcare monitoring. Read more about deployment metrics and technical guides on the Human Presence Detection Sensor Guide.