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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.

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My project includes a PIR sensor. The sensor should start reliably detecting motion within 8 seconds after power-up. The amplifiers in PIR circuits have high gain thus large resistors, causing a long ...
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I have a active buzzer and a PIR motion sensor and an Arduino board. While I try to achieve, when there is motion then a buzzer to make the beep sound and between each motion to be a delay. But the ...
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Wanted to tap into the PIR movement sensor on an outdoor solar powered security light, but instead of the classic PIR where the centre pin goes high when movement is detected, I found this particular ...
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I have been trying to create a project of adaptive light brightness using BASYS 3 FPGA and a PIR Motion Sensor HC-SR501. I connected the output of the motion sensor to a PMOD pin in the BASYS 3 to ...
Ahyube's user avatar
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I'm working on a project to create a wireless motion detector using a PIR sensor and an RF transmitter. Both circuits function well independently, but when I connect them, I encounter issues. ...
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I am testing the following schematic on a breadboard, where CMP1 and CMP2 are comparators on the same LM339 IC. Supply is 6V for the entire circuit. simulate this circuit – Schematic created ...
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I am making a burglar alarm system for my high school project. It uses a PIR sensor, a piezo buzzer, switch, battery, transistor, resistor and an LED. However, I have a 9V battery and a MPS2 222 AAAA ...
Reva Kantaria's user avatar
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I have a PIR (passive Infrared sensor that has an unmarked IC in it that performs all the PIR related functions. The only other active component on the module is voltage regulator. I would like to ...
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Pictured is a PIR (passive infra-red) sensor hooked up to a JFET. The diagram is from these design notes, which describes the workings of the PIR sensor as: ...
cornelius's user avatar
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I have been designing a PIR sensor circuit for occupancy sensor. We have been facing problems like fault detections most of the time when we turn on air conditioning. There is also issues like the ...
Aakas Pulikkal's user avatar
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I am using D203B model of PIR and I used the circuit that was suggested on its datasheet (first pic). I do not know what the problem is, as the output (pin the 8 and 14) of op-amp (LM324)is always on (...
Saeed's user avatar
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I created a product demo box that completes a circuit once the "push to start" button is pressed. Closing the circuit allows the customer to see my product in action while holding down a ...
Charles's user avatar
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Well I am Working on a PIR occupancy sensor project and the issue is, it is having false detection on occasions like when an air conditioner or a fan is turned on, well I can't figure what to do?
Aakas Pulikkal's user avatar
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I need your help with my HC-SR501. I'm not really deep into all the electronical device stuff, only got some basic knowlegde. I did some research here but didn't find a solution to my problem. I have ...
Patrick's user avatar
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I am using a Murata IRA-S500ST01A01 PIR motion sensor. This is the datasheet. Based on a description of the pyro-electric effect from part 2 of these application notes for the IRA S210 (same family of ...
cornelius's user avatar
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Can someone please explain the operation of this circuit diagram of a PIR sensor led light. The high voltage "ground" connections in the original diagram have been replaced with connections ...
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I've tried to create a flow diagram of some electronics I'm trying to do for a project at home which is a motion activated light up frame (added a photo of the lights in the frame but this isn't the ...
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I am designing a PIR sensor circuit to detect human movement. I am supposed to display movement using an oscilloscope (the response from this PIR sensor.) I have used the following circuit but it does ...
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I'm developing a PIR sensor, I'm new in this (PIR sensors) and saw that there are sensors that have two elements while some have four elements. Are there more types? What's the difference? Is there ...
E_Blue's user avatar
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I’m trying to light two 2.2V 20mA LEDs using a 9 volt battery, a PIR motion sensor and a transistor. Wired as shown with 9 volts applied at the collector and the 3.3 volt signal from the PIR applied ...
SamSpade's user avatar
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I have a PIR sensor/switch with the below wiring diagram. The way my lights were configured is that the load (LED light with transformer) is on the wire, so I only have two wires available instead of ...
sorin's user avatar
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See the small circuit of a PIR motion sensor below. I've tried to find more than one circuit online but every single time it shows a different value for the resistor. I would be grateful if anyone can ...
Martiinii's user avatar
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I'm using this circuit as one bit memory for PIR sensor state. This way I can read PIR triggers when I wake ESP8266 from deepsleep. The circuit is working fine, however I get false trigger each time ...
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I installed a PIR sesnor for multiple rooms in my house and they worked perfectly for the past six months. I recently noticed a change in their performance. They barely detect my movement even if I'...
motion channel's user avatar
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I am using a TEMT6000 LDR and a PIR to turn on outdoor lighting, well that's the plan. The LDR and PIR are in the same housing, and after some searching on forums, I found that I can combine the V-...
snewpers's user avatar
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I am new to Arduino, and I have a problem that I can't solve on my own. I am trying to connect multiple PIR motion sensors with a single wire, in parallel and onto one pin on my Arduino. I am thinking ...
Vid's user avatar
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I am trying to connect a DC 6-30V 1-Way Relay Module Power-off Trigger Delay Cycle Timer Switch with an HC-SR501 Infrared PIR Motion Sensor Module. The output of the motion sensor is only 3 V. Do you ...
K4ever's user avatar
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I'm trying to build a simple burglar alarm circuit and I've found one online that uses a knife switch, 9 V power source and an SCR. I'm trying to change it over to a PIR motion sensor but am unsure ...
cwhitehouse's user avatar
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I'm new to opamps and I could use some help amplifying a PIR sensor and output to a microcontroller. Minimum component count without compromising performance (highly integrated solutions). Here is a ...
7E10FC9A's user avatar
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I have connected a SR501 is powered by 5v converted from 12v through 7805 voltage regulator. The output voltage on the signal pin is normally 5v and on high it outputs 8v. This makes my relay module ...
Ramki's user avatar
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I am trying to turn on some LEDs with a Raspberry Pi using PIR. I have purchased, 1200w PIR LEDs Raspberry Pi The PIR provided is slightly different to the one in the listing as it has four ...
James Geddes's user avatar
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The passive infrared (PIR) motion sensor detects movement of infrared light sources with wavelengths ranging from 7 μm to 14 μm. Is there a way to make it detect below 10μm or to make it detect ...
Vasant Joseph's user avatar
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10 votes
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I grew up incorrectly believing that motion detectors (as part of burglar alarm systems) were designed to detect movement, when in actual fact it is the movement of a heated (like body heat) object ...
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I am a software engineer by profession but love to tinker around with electronics. I recently worked on an IOT project for a smart home using a Raspberry Pi and self aware modules consisting of an ...
Aslam's user avatar
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I am using an esp32-cam to stream video. As it is steaming I want to take a picture and save it to a micro SD card when motion is detected. Hardware: ESP8266-12e, ESP32-CAM, EKMC2604112K panasonic ...
user1114881's user avatar
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I have a PIR EKMC1606112 that I am trying to read using an ESP8266-12e. I have the PIR powered using a 5v regulator so I'm sure it is getting enough voltage. My problem is that when I have the sensor ...
user1114881's user avatar
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I´m playing around with some PIR-Sensors (I don´t know the exact type) and I don´t have any experience in designing circuits for this type of sensor. I have googled some basic circuits and I took a ...
Kampi's user avatar
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I would like to make some LED lamps for night use, therefore at low intensity, just enough to see where you are walking, but almost without waking up. ;-) It should only turn on when it detects ...
Overlights's user avatar
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4 votes
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I read this application note from Texas Instruments to learn something about the design of an analog frontend for PIR sensors, but I don´t know the function of the first OpAmp circuit. What is the ...
Kampi's user avatar
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I've several of PIR sensor modules (HC-SR501) which are designed for a 5v input. However, I need it to run on a 3.3V system only. To achieve this, I removed the diode which is in series with the input ...
jancoow's user avatar
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I am tying to implement something using PIR sensor and Arduino UNO. I did the wiring like this VCC - 5v GND - GND Dout - Pin 3 Here is my code ...
Sandeep Thomas's user avatar
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I would like to ask a general question and get a discursive answer, but I know that's discouraged here so I'll ask the general question, then pose a more specific one. In general: What happens if I ...
hazymat's user avatar
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My end goal here is to launch a camera strapped to outside of the payload of a High Altitude Balloon to take pictures at 5 second intervals during ascent and descent. Trying out a few ideas, I've ...
vicatcu's user avatar
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I used a triac to control the AC current to my led bulb 💡 but once the bulb is in on state, it's flickering. I made a bridge rectifier and using transistor connected to triac, the input is given ...
Sijith's user avatar
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When a PIR detector switches something on e.g. a 12V light, I know I could use a microprocessor to keep it on or do anything that I choose to programme. If I didn't want to use a microprocessor, how ...
Steve's user avatar
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I have a SRD-12VDC-SL-C relay with this configuration: https://www.iotwebplanet.com/product/relay-module/ And I want to trigger it with PIR Motion Sensor Detector Module HC-SR501 https://robu.in/...
Mohak Shukla's user avatar
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I have a SRD-12VDC-SL-C relay with this configuration: https://robu.in/product/1-roadchannel-relay-module-light-coupling-12v/ And I want to trigger it with PIR Motion Sensor Detector Module HC-SR501 ...
Mohak Shukla's user avatar
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As i am not a graduate of electronics i have no idea about the transistor that i need to use. Can anyone suggest which N channel MOFOSET should I use to turn on my 12V 6A LED strip. The output given ...
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I'm using MCP6044 Quad OpAmp (Datasheet) for battery powered PIR sensor, it works fine but draws too much current. When I plug it to 3V source (VDD: 3V, VSS: GND) with no load it draws around 550uA, ...
Arksu's user avatar
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I have a Panasonic PIR sensor (EKMC1603111) and am measuring the voltage between the output pin and ground pin. On the green multimeter I read 0v when there is no motion and 3.3v when there is motion ...
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