PIR & Motion Sensor
PIR & Motion Sensor
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. How Temperature Affects PIR Sensors Sensitivity Variation Pyroelectric materials have temperature-dependent properties. Sensitivity typically…
Project Overview This project creates a driveway alert system that detects vehicles or people approaching your property and sends a notification to a receiver inside your home. It is perfect for long driveways, rural properties, or anywhere you want to…
Project Overview This project connects a PIR sensor to IFTTT (If This Then That), allowing you to trigger thousands of smart home actions. When motion is detected, you can turn on lights, send notifications, log data to spreadsheets, control smart…
Introduction PIR sensors and modules offer different output interfaces. Choosing the right one and interfacing correctly is essential for reliable operation. Output Interface Types Push-Pull Digital Output Output is actively driven HIGH to VCC and LOW to GND. Can source…
Project Overview This project creates a wildlife camera trigger system that captures photos or videos when animals are detected. A PIR sensor detects animal movement and triggers a camera (GoPro, DSLR, or USB camera) to capture images, perfect for observing…
Project Overview This project creates an automatic fan control system that turns on a ceiling or desk fan when someone enters a room and turns it off after they leave. It is perfect for bathrooms, workshops, or any room where…
Introduction Battery-powered PIR sensors enable wireless installations in locations without mains power. Achieving multi-year battery life requires careful power management. PIR Sensor Power Consumption Basics Sensor Type Standby Current Active Current HC-SR501 (module) 50-65 µA ~3 mA AM312 (mini module)…
Project Overview This project creates a fall detection system that monitors an elderly person’s activity and alerts caregivers when a fall is suspected. Using multiple PIR sensors placed strategically, the system detects unusual patterns—sudden motion followed by prolonged inactivity—and sends…
Project Overview This project creates a gesture-controlled light switch that turns lights on and off with a simple hand wave. Using a PIR sensor, the system detects motion and toggles a relay that controls the light. A short wave turns…
Introduction Almost all PIR sensors use a dual-element design. This is not arbitrary – it’s essential for the sensor’s function. This article explains why two elements are better than one. The Problem with Single-Element Sensors A single pyroelectric element responds…