Premium Only Content

Motion Detector Circuits using PIR
Hey everyone, welcome to the #E circuit! Today, we're diving into the fascinating world of motion detection with PIR sensors. You've probably seen these used in home security systems and automatic lighting – they're pretty cool little devices.
So, what exactly is a PIR sensor? Well, PIR stands for Passive Infrared. The key word here is "passive." Unlike some sensors that emit their own signals, PIR sensors simply detect infrared radiation that's already present in the environment. Think of it like this: everything with a temperature above absolute zero emits infrared light, including us humans. PIR sensors are specifically designed to pick up changes in this infrared radiation, particularly those caused by the movement of warm bodies.
How does it work? Inside the sensor, there's a special material that generates an electrical charge when it's exposed to infrared radiation. When a warm object, like a person, moves within the sensor's field of view, the amount of infrared radiation hitting the sensor changes. This change in radiation causes a change in the electrical charge, which the sensor then detects.
This tiny electrical signal is then amplified by a built-in circuit, usually involving a Field Effect Transistor (FET). This amplified signal is what triggers the alarm or other connected device.
In this video, we're going to explore five different ways to build motion detector circuits using op-amps and transistors, which are common electronic components. We'll also take a closer look at the pinout of a very popular PIR sensor, the RE200B, so you can easily integrate it into your own projects.
Hey everyone, welcome to the #E circuit! Today, we're diving into the fascinating world of motion detection with PIR sensors. You've probably seen these used in home security systems and automatic lighting – they're pretty cool little devices.
So, what exactly is a PIR sensor? Well, PIR stands for Passive Infrared. The key word here is "passive." Unlike some sensors that emit their own signals, PIR sensors simply detect infrared radiation that's already present in the environment. Think of it like this: everything with a temperature above absolute zero emits infrared light, including us humans. PIR sensors are specifically designed to pick up changes in this infrared radiation, particularly those caused by the movement of warm bodies.
How does it work? Inside the sensor, there's a special material that generates an electrical charge when it's exposed to infrared radiation. When a warm object, like a person, moves within the sensor's field of view, the amount of infrared radiation hitting the sensor changes. This change in radiation causes a change in the electrical charge, which the sensor then detects.
This tiny electrical signal is then amplified by a built-in circuit, usually involving a Field Effect Transistor (FET). This amplified signal is what triggers the alarm or other connected device.
In this video, we're going to explore way to build motion detector circuits using op-amps and transistors, which are common electronic components.
So, if you're interested in learning how to build your own motion-sensing devices, stick around! We're going to break it all down step by step.
-
LIVE
Kim Iversen
1 hour agoHegseth Summons Top Brass — Is War With Russia Incoming?
1,069 watching -
1:31:41
Redacted News
1 hour agoNew Charlie Kirk Video Evidence Could Change EVERYTHING | Redacted w Natali & Clayton Morris
37K72 -
1:54:22
vivafrei
3 hours agoOstrich Farm UPDATE! And Live with Tyler Fischer Talking REAL Cancel Culture He is Experiencing!
137K17 -
31:39
Michael Franzese
1 hour agoAmerica’s Human Trafficking Crisis EXPOSED by Former Mobster
9.4K2 -
LIVE
Barry Cunningham
5 hours agoPRESIDENT TRUMP NEEDS TO STAND FIRM AND SHUT THE GOVERNMENT DOWN IF HE HAS TO!
1,629 watching -
23:45
IsaacButterfield
12 hours ago $0.19 earnedThe Rise of Autism in Gen Z
1.47K11 -
LIVE
LFA TV
1 day agoBREAKING NEWS ALL DAY! | THURSDAY 9/25/25
1,382 watching -
1:59:20
The Quartering
7 hours agoCharlie Kirk Conspiracies Go TOO FAR, Youtube Re-Bans Everyone & Libs Dying From Tylenol
134K83 -
DVR
The Trish Regan Show
3 hours agoTrump SUES Disney Over Kimmel’s Return to ABC! Disney CEO, Kimmel BOTH OUT!?!
10K5 -
1:07:22
Dr. Drew
5 hours agoTargeted: Political Violence Began Long Before Charlie Kirk's Assassination – Leftist Influencers Like Hasan Piker Are Making It Worse w/ Dave Rubin & Jack Posobiec – Ask Dr. Drew
27.1K1