PIR & Motion Sensor
PIR & Motion Sensor
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…
Project Overview This project creates a wireless motion notification system that uses ESP-NOW protocol to send alerts between ESP32 boards without requiring a Wi-Fi network. It is perfect for monitoring remote locations like workshops, sheds, or entry gates where Wi-Fi…
Project Overview This project creates a touchless automatic trash can lid that opens when you wave your hand or approach with trash. A PIR sensor detects motion, and a servo motor lifts the lid. After a few seconds, the lid…
Project Overview This project creates an energy-saving HVAC control system that automatically adjusts temperature settings based on room occupancy. When a room is occupied, the system maintains normal temperature; when the room is empty for a set period, it enters…