PIR & Motion Sensor
PIR & Motion Sensor
Introduction Large televisions, particularly older plasma screens, can emit significant infrared radiation and electrical noise that interferes with PIR sensors. This is a common issue in home theaters. How Displays Cause Interference 1. Plasma TVs (Worst Offenders) Plasma displays work…
Introduction We’ve covered why standard glass blocks PIR detection. But what if you absolutely must detect through a window? This article covers advanced, sometimes experimental, solutions. Why Standard Glass Blocks IR (Recap) Ordinary soda-lime glass is opaque to 8-14µm infrared…
Introduction Electric motors generate electrical noise when starting and running. This noise can couple into PIR sensor circuits, causing false triggers. This is common with fans, pumps, garage door openers, and power tools. How Motors Cause Interference 1. Conducted Noise…
Introduction Many users integrate PIR sensors with ESPHome or Tasmota on ESP8266 After a firmware update, the sensor may stop working. This is usually due to configuration changes, not hardware failure. Common Causes 1. Pin Mapping Changes The new firmware…
Introduction Solar power systems are becoming common, and they can interfere with PIR sensors in two ways: thermal radiation from hot panels and electrical noise from inverters. Two Types of Interference 1. Thermal Radiation from Panels Solar panels get hot…
Introduction High humidity environments like bathrooms, greenhouses, and tropical locations can cause PIR sensors to malfunction. Moisture in the air and on the lens interferes with infrared transmission. How Humidity Affects PIR Sensors 1. Water Vapor Absorption Water vapor absorbs…
Introduction Hot water pipes running behind walls or ceilings can cause PIR sensors to false-trigger. When hot water flows, the pipe warms up, creating a moving heat source that the sensor may detect. Why Water Pipes Cause False Triggers When…
February 2026 – NHTSA Finalizes Child Presence Detection Rule The National Highway Traffic Safety Administration (NHTSA) has finalized regulations requiring all new passenger vehicles weighing less than 10,000 pounds to include child presence detection systems by the 2028 model year.…
February 2026 – MIT Graphene Research Could Transform PIR Sensors A research team at MIT has demonstrated a graphene-based pyroelectric sensor with sensitivity approximately 100 times higher than conventional lithium tantalate or PZT-based sensors. The breakthrough, published in Nature Photonics,…
February 2026 – Nest Learning Thermostat (4th Gen) Features PIR Occupancy Google has unveiled the 4th generation Nest Learning Thermostat, featuring an integrated ultra-low power PIR sensor for accurate room occupancy detection. This marks a significant upgrade from previous models…