PIR & Motion Sensor
PIR & Motion Sensor
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…
Introduction Choosing the right PIR motion sensor for your smart home can be overwhelming. This guide walks you through key considerations to find the perfect sensor for your specific needs. What to Look For 1. Smart Platform Compatibility Amazon Alexa:…
Introduction Pet owners face a common dilemma: how to keep security systems armed without triggering false alarms from cats and dogs. Pet-immune PIR sensors use specialized lenses and signal processing to ignore animals while still detecting humans. This guide covers…
Introduction While many PIR applications work with default settings, precision applications require systematic calibration. This guide covers calibration procedures for optimal performance. Why Calibrate? Compensate for sensor-to-sensor variation Adapt to specific installation environment Optimize detection vs. false alarm trade-off Meet…