PIR & Motion Sensor
PIR & Motion Sensor
Introduction The raw output from a pyroelectric sensor is a tiny signal, typically millivolts or less, requiring significant amplification before it can be processed. This guide covers the design of a complete analog front-end. Signal Characteristics Amplitude: 1-50 mV peak-to-peak…
Introduction To properly place a PIR sensor, you need to understand its field of view (FOV) and how it translates to actual coverage area. This article provides the formulas and calculations needed. Basic Parameters Horizontal FOV (θ_h): The angle the…
Introduction The Murata IRA-S200ST01 is a high-performance pyroelectric infrared sensor widely used in security systems, automatic doors, and occupancy detection. This article provides a complete technical analysis of its specifications, characteristics, and integration requirements. Key Specifications Parameter Value Package TO-5…
Introduction PIR sensors have been around for decades, but they continue to evolve. Here are the key trends shaping the future of motion sensing. 1. Ultra-Low Power for Energy Harvesting As IoT devices aim for battery-free operation, PIR sensors are…
Introduction A PIR sensor datasheet contains all the technical information you need to use the sensor correctly. But if you’re new, the jargon can be overwhelming. This guide explains common sections and parameters. Typical Sections of a PIR Sensor Datasheet…
Introduction Home Assistant is a popular open-source home automation platform. Combining it with ESP32 and PIR sensors lets you create powerful automations. This guide walks you through the setup. Hardware Needed ESP32 development board (e.g., NodeMCU-32S) PIR sensor (AM312 or…
Introduction Thermopile sensors are often confused with PIR sensors because both detect infrared. However, they operate on different principles and serve different purposes. This article clarifies the differences. PIR (Passive Infrared) – Motion Detection Principle: Pyroelectric effect – generates charge…
Introduction When you need to detect motion or presence, you have several technology choices. Each has strengths and weaknesses. This article compares PIR (Passive Infrared), microwave Doppler, and mmWave radar to help you choose. PIR (Passive Infrared) How it works:…
Introduction With so many PIR sensor modules on the market, choosing the right one can be overwhelming. We’ve tested dozens and compiled this list of the top 10 PIR sensors for 2025, considering factors like price, reliability, power consumption, and…
Introduction A PIR sensor that stays triggered (output HIGH) indefinitely can be annoying and render your project useless. Let’s troubleshoot why it won’t turn off. 1. Hold Time Too Long If the hold time (delay) potentiometer is turned to maximum,…