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PIR & Motion Sensor

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PIR & Motion Sensor

  • Pirsensor News

How to Choose the Right Fresnel Lens for Your PIR Sensor

Introduction The Fresnel lens is often overlooked, but it’s crucial to PIR sensor performance. Different lenses create different detection patterns. Choosing the right lens can make or break your project. What Does a Fresnel Lens Do? The lens focuses infrared…

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  • Pirsensor News

5 Common Mistakes When Using PIR Sensors (And How to Avoid Them)

Introduction PIR sensors seem simple, but there are common pitfalls that lead to frustration. Learn from others’ mistakes. Mistake 1: Not Allowing Warm-Up Time The problem: You power up the sensor and immediately test, but it doesn’t work or triggers…

Read More5 Common Mistakes When Using PIR Sensors (And How to Avoid Them)
  • Pirsensor News

How to Test a PIR Sensor with a Multimeter

Introduction Before connecting a PIR sensor to your microcontroller, it’s wise to test it independently. A multimeter is all you need to verify power, output, and basic functionality. What You’ll Need Digital multimeter (any basic model) PIR sensor (e.g., HC-SR501)…

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  • Troubleshooting

How to Test a PIR Sensor with a Multimeter

Introduction Before connecting a PIR sensor to your microcontroller, or if you suspect a sensor is faulty, testing it with a multimeter is quick and definitive. Here’s how. What You’ll Need Digital multimeter (with voltage measurement) Power supply (e.g., 5V…

Read MoreHow to Test a PIR Sensor with a Multimeter
  • Troubleshooting

Arduino PIR Sensor Not Triggering? Code and Wiring Check

Introduction You’ve connected a PIR sensor to your Arduino, uploaded a sketch, but nothing happens when you wave your hand. Let’s systematically debug the issue. 1. Verify Hardware Connections The most common mistake is incorrect wiring. For HC-SR501: VCC →…

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  • Troubleshooting

PIR Sensor Behind Glass: Does It Work?

The Short Answer No, a standard PIR sensor will not work reliably behind glass. Glass is opaque to the mid-infrared wavelengths (8-14 μm) that PIR sensors detect. Why Glass Blocks Infrared Ordinary glass (soda-lime glass) is transparent to visible light…

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  • Troubleshooting

Outdoor PIR Sensor Problems: Rain, Heat, and False Alarms

Introduction Using PIR sensors outdoors opens a world of possibilities—security lights, gate openers, wildlife cameras—but also introduces new problems. Here’s how to tackle common outdoor issues. 1. Rain and Moisture Water on the lens can scatter infrared and cause false…

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  • Troubleshooting

PIR Sensor Sensitivity Too Low? How to Extend Range

Introduction A PIR sensor that only detects motion at close range may be ineffective for your application. Before replacing it, try these methods to maximize its detection distance. 1. Adjust the Sensitivity Potentiometer Most PIR modules have a potentiometer labeled…

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  • Troubleshooting

Why Does My PIR Sensor Keep Triggering Randomly?

Introduction Few things are more frustrating than a motion sensor that triggers for no apparent reason. If your PIR sensor is acting up, here are the most likely culprits and how to address them. 1. Heat Sources PIR sensors detect…

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  • Troubleshooting

PIR Sensor Not Working? 7 Common Fixes

Introduction You’ve connected your PIR sensor, uploaded the code, but nothing happens. Or maybe it’s triggering randomly. Don’t worry—most PIR issues are easy to fix. Here are 7 common problems and their solutions. 1. Check Power Supply Symptom: Sensor doesn’t…

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