PIR & Motion Sensor
PIR & Motion Sensor
March 2026 – PIR Sensors Reach New Price Low According to component market intelligence firm SupplyFrame, the average selling price (ASP) of basic PIR sensor modules (HC-SR501 and equivalents) has fallen below $0.50 for the first time, reaching $0.48 in…
March 2026 – STM32 PIR Sensor Design Enables 10-Year Battery Life STMicroelectronics has announced a new reference design for battery-powered PIR motion sensors, combining an ultra-low-power STM32U5 microcontroller with the Excelitas PYD 2597 pyroelectric sensor. The design achieves average current…
March 2026 – Smart Lighting Dominates PIR Sensor Applications A comprehensive new report from IoT Analytics reveals that smart lighting has become the largest and fastest-growing application segment for PIR sensors, accounting for 38% of total unit shipments in 2025…
March 2026 – TI Simplifies PIR Sensor Design with New IC Texas Instruments has announced the PGA460, a dedicated signal conditioning integrated circuit for pyroelectric infrared sensors. The new IC combines all the analog front-end components needed for PIR sensors…
Introduction In cold climates, people wear heavy clothing that insulates body heat. This can reduce the infrared signal reaching the PIR sensor, making detection difficult. Why Heavy Clothing Affects Detection PIR sensors detect the infrared radiation emitted by a person’s…
Introduction High-power radio transmitters like ham radio rigs (100W+) or CB radios can cause PIR sensors to false-trigger. The strong RF field can be rectified by the sensor’s electronics, creating false signals. How RF Interference Happens The high-gain amplifiers in…
Introduction Battery-powered PIR sensors often work well with fresh batteries but fail as voltage drops. This isn’t always a simple case of “replace batteries” – the sensor’s behavior changes gradually. How Low Voltage Affects PIR Sensors 1. Reduced Sensitivity As…
Introduction Ceiling fans are a common source of false triggers for PIR sensors, especially when the sensor is mounted on the ceiling near the fan. The moving blades create changing IR patterns that mimic motion. How Ceiling Fans Cause False…
Introduction Direct sunlight is one of the toughest challenges for PIR sensors. The intense infrared radiation from the sun can saturate the sensor, making it unable to detect human motion. This article explains why and how to fix it. Why…
Introduction A dirty lens is one of the most common causes of reduced PIR performance. Dust, grease, pollen, and spider webs all block infrared. Proper cleaning restores performance. Signs Your Lens Needs Cleaning Gradual decrease in detection range. Inconsistent detection…