PIR & Motion Sensor
PIR & Motion Sensor
Introduction Pyroelectric sensors are widely used in flame detectors for industrial safety systems. Unlike motion detection, flame detection relies on sensing the characteristic flicker of flames and their spectral signature. Flame Characteristics Flames from hydrocarbon fires have two key properties…
Introduction Pet-immune PIR sensors allow pet owners to keep security systems armed without false alarms. This guide covers the best options for 2026. How Pet-Immune Sensors Work Optical masking: Lens creates detection zones only above a certain height Signal processing:…
Introduction Traditional PIR sensors detect motion, not presence. When a person sits still at a desk, reading, or watching TV, they become invisible. High-sensitivity PIR sensors solve this by detecting micro-movements like breathing, small gestures, and subtle shifts. This guide…
Introduction While commonly used for motion detection, pyroelectric sensors are also the heart of Non-Dispersive Infrared (NDIR) gas sensors. This article explains the principles and applications. NDIR Principle NDIR gas sensing works on the principle that many gases absorb infrared…
Introduction With dozens of PIR modules available, choosing the right one for your Arduino project can be confusing. This guide covers the most popular options and when to use each. Popular PIR Modules HC-SR501 – The Classic Price: $2-3 Voltage:…
Introduction ESP32 and ESP8266 are popular choices for IoT motion sensors due to their built-in Wi-Fi and low-power capabilities. However, choosing the right PIR sensor for these 3.3V boards requires attention to voltage compatibility and power consumption. This guide covers…
Introduction PIR sensors are inherently sensitive to temperature because they detect thermal radiation. Ambient temperature changes can significantly affect performance, causing false triggers or missed detections. This guide covers compensation techniques. How Temperature Affects PIR Sensors Sensitivity Variation Pyroelectric materials…
Introduction Outdoor PIR sensors face harsh conditions: rain, snow, temperature extremes, and direct sunlight. Choosing the right sensor requires considering weather resistance, detection range, and false alarm immunity. Key Features for Outdoor Sensors 1. Weather Resistance (IP Rating) IP44: Splash-proof,…
Introduction Wireless PIR sensors offer easy installation without wiring, but battery life varies dramatically between models. Some sensors last months, others years. This guide covers the best battery-powered wireless PIR sensors for 2026, focusing on real-world battery life and reliability.…
Introduction While a single PIR sensor can detect motion, multiple sensors in an array can count people, determine direction, and even track movement. This guide covers array configurations and signal processing techniques. Why Use Arrays? People counting: Determine number of…