PIR & Motion Sensor
PIR & Motion Sensor
Introduction PIR sensors are designed to detect human body radiation, which peaks around 9.7 μm. To achieve this selectively, they incorporate optical filters that transmit only the 8-14 μm band while blocking other wavelengths. Why Spectral Filtering Matters Without filtering,…
Introduction Arduino projects often use PIR sensors for motion detection, but with dozens of modules available, choosing the right one can be confusing. This guide covers the most popular PIR sensor modules for Arduino, their characteristics, and when to use…
Introduction Noise is the enemy of reliable PIR detection. This guide identifies noise sources and provides practical mitigation strategies. Types of Noise in PIR Systems 1. Thermal Noise (Johnson-Nyquist) Fundamental noise from thermal agitation of charge carriers. Present in all…
Introduction Outdoor PIR sensors face harsh conditions: rain, snow, temperature extremes, direct sunlight, and wildlife. Choosing the right sensor for outdoor use requires considering weather resistance, detection range, and false alarm immunity. This guide covers the best options for 2026.…
Project Overview Create a fun Halloween decoration that comes to life when trick-or-treaters approach. When the PIR sensor detects motion, the ghost lights up with eerie LEDs, plays spooky sounds, and can even move using a servo motor. Difficulty: Beginner…
Project Overview This project creates a smart plant watering system that reminds you to water your plants when motion is detected nearby, or automatically waters based on soil moisture. It’s perfect for indoor plants that are easily forgotten. Difficulty: Beginner/Intermediate…
Project Overview This project creates a humane dog bark deterrent that uses ultrasonic sound to discourage excessive barking. The system activates only when motion is detected, saving battery life and preventing constant noise. When the sensor detects a dog (or…
Project Overview This project creates a self-powered PIR motion sensor that runs entirely on solar energy. It’s ideal for remote locations where running power cables or changing batteries is impractical. The system stores energy in a supercapacitor or rechargeable battery,…
Project Overview This project creates a smart night light that turns on when motion is detected and gradually dims over time. The light uses an RGB LED or LED strip and features smooth fade-out effects, making it perfect for bedrooms,…
Project Overview This project creates an occupancy counter that tracks how many people are in a room. Using two PIR sensors placed at a doorway, the system detects direction of movement (entry vs. exit) and maintains a count of current…