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Questions tagged [pir]

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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1 answer
145 views

Convert continuous signal of HC-SR501 PIR sensor to a single pulse

HC-SR501 PIR sensor sends a continuous signal of 0-3.3V for the period of 4-8 seconds (depending upon the delay set). Is there a way/IC I can convert this signal to a single pulse of 1 sec, preferably ...
2 votes
1 answer
485 views

PIR triggers relay without motion

simulate this circuit – Schematic created using CircuitLab I'm using a HC-SR501 PIR sensor and a 12V relay to switch between green (NO) and red (NC) on a LED strip, everything being powered by ...
0 votes
1 answer
166 views

Explanation of the circuit diagram of a PIR sensor activated light

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 ...
0 votes
1 answer
73 views

Identifying a PIR device

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 ...
0 votes
2 answers
176 views

PIR sensor amplifier with minimum component count

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 ...
0 votes
1 answer
63 views

Is there an established way to model this PIR + JFET circuit?

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: ...
0 votes
0 answers
22 views

PIR sensor and its working

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 ...
1 vote
0 answers
47 views

PIR Circuit Problem

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 (...
0 votes
1 answer
177 views

Connect DC 6-30V 1-Way Relay Module Power-off Trigger Delay Cycle Timer Switch with PIR Motion sensor?

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 ...
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0 answers
18 views

Wiring of buttons in solenoid and PIR sensor

Folks, have been working on the project and I'd appreciate any help with checking if everything wired correctly and if there's anything needs to be added or is redundant. Project is straightforward: ...
0 votes
0 answers
13 views

question about pir sensor lhi878

I am conducting an experiment with the Lhi 878 sensor, and when I input 5V, the output is connected to an oscilloscope without any significant load. The output is detected around 1V within a range of ...
1 vote
1 answer
225 views

What is a suitable resistor value for this circuit?

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 ...
0 votes
2 answers
330 views

Passive Infrared (PIR) Motion Sensor

I want to have the PIR Motion Sensor: https://www.adafruit.com/product/189 Used to turn on a light whenever it detects motion. Simple enough, but would it be possible to have this done wirelessly? ...
1 vote
1 answer
136 views

How to introduce a PIR motion sensor and/or timer into my circuit?

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 ...
1 vote
1 answer
650 views

Connecting a 240 V PIR motion detector to a Raspberry Pi

I want to connect a 240 V PIR motion detector directly to my Raspberry Pi 3. Inside its plastic case I found two PCBs. One is the power supply board which has a 24 VDC relay, an S9013 NPN transistor, ...
0 votes
1 answer
38 views

PIR sensor and the fault detection related to it

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?
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0 answers
39 views

PIR Sensor Interference When RF Transmitting

I have created a small DIY circuit which sends a signal over 433.92Mhz when a PIR sensor is triggered. The circuit consists of 4 modules soldered onto stripboard. Schematic: Components are: 0.71mm ...
0 votes
1 answer
371 views

Noisy or malfunctioning PIR HC-SR505 sensor

I bought 5 PIR Sensors to trigger when movement is detected, using an Arduino. During bench tests, all 5 sensors show many false triggers. I wonder if all 5 sensors have something wrong, or whether ...
1 vote
1 answer
353 views

How to use a PIR motion sensor to light up a 3.8 VDC bulb using battery and relay

I would like to detect motion to turn off my 3.8 V, 0.3 A DC light bulb using a PIR motion sensor. Recently I tried to connect it to a 5 V relay, Arduino Uno, and two 3.7 V Li-ion batteries, and the ...
0 votes
0 answers
24 views

HC-SR501 PIR sensor with 3.6V LED strip

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 ...
0 votes
1 answer
321 views

How to connect multiple digital sensors with single wire?

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 ...
0 votes
1 answer
93 views

Is this behavior for a Murata PIR motion sensor test circuit expected?

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 ...
1 vote
1 answer
248 views

Saving a picture to MicroSD while streaming video upon motion detection

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 ...
0 votes
0 answers
75 views

Does this electronics flow chart work as a system?

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 ...
2 votes
1 answer
383 views

PIR sensor circuit

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 ...
1 vote
1 answer
50 views

How many types of pyroelectric sensor exist? [closed]

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 ...
0 votes
1 answer
95 views

What do I need to make this circuit work?

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 ...
-1 votes
1 answer
164 views

How to wire a PIR sensor that requires neutral when local does not have one? [closed]

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 ...
0 votes
0 answers
242 views

HC SR501 PIR false triggers

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 ...
0 votes
0 answers
167 views

HC-SR501 PIR sensor range issue

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'...
0 votes
0 answers
184 views

Problem with LDR + PIR

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-...
10 votes
6 answers
3k views

A few questions on PIRs and other motion detectors

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 ...
3 votes
0 answers
136 views

Need help building simple burglar alarm circuit

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 ...
1 vote
1 answer
410 views

PIR sensor bypass for LED light strip

I don't know that much about electronics, but I was able to put together this PIR module: (original) and a LED strip and everything works just fine, when the PIR detects motion, it turns the strip ...
3 votes
1 answer
3k views

Motion sensor to detect birds and small animals but ignore humans

I would like to develop a motion activated sprinkler to deter birds (cranes and other smaller birds) and small animals from eating the fish in my pond. I am using the approach of controlling a ...
1 vote
1 answer
1k views

How to get immediate state of DYP-ME003DD PIR sensor?

I am trying to detect movement for a project and have a DYP-ME003DD PIR sensor. It has 4 pins, +,-,CDS (I think this is what it says, it's hard to read) & OUT. When I connect it to my Arduino and ...
0 votes
0 answers
541 views

SR501 PIR Motion sensor outputs high voltage in signal pin

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 ...
0 votes
1 answer
161 views

How to manipulate a PIR sensor?

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 ...
1 vote
1 answer
128 views

How do you use a mains PIR with a Raspberry Pi?

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 ...
1 vote
1 answer
225 views

PSOC 5 interfacing with PIR sensor

I am trying to interface the PSOC5 LP097 with PIR sensor to trigger the stepper motor for my Pet Feeder System. In addition, everytime the PIR sensor detects a movement, I try to send a mail using ...
0 votes
1 answer
388 views

How can a PIR sensor light be made to work with a power bank? [closed]

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 ...
3 votes
2 answers
2k views

thermistor in HC-SR501 PIR

i know the effects of soldering photo-resistor to HC-SR501 PIR module. It then detects movement in the dark only. But can anyone tell me that what is the effect of adding a thermistor to the same PIR ...
0 votes
1 answer
430 views

Always getting HIGH reading from PIR on ESP8266-12e pin D7

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 ...
0 votes
5 answers
200 views

PIR-Sensor doesn´t generate a signal

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 ...
0 votes
1 answer
535 views

Night LED Lamp with PIR Sensor - Guide to calculation parameters

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 ...
3 votes
3 answers
661 views

Understanding analog frontend for PIR sensor

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 ...
0 votes
0 answers
237 views

PIR sensor triggering randomly when connected to an esp8266

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 ...
0 votes
1 answer
2k views

Wiring 2 separate PIR’s to an LED Floodlight

If possible can someone please confirm that this would work? I want to place a waterproof box on the front of the house, next to this I will put an LED floodlight (without PIR), I then want to put 1 ...
0 votes
1 answer
174 views

PIR sensor detects motion only when a very near motion to the IR sensor and when the cover opened

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 ...
0 votes
0 answers
78 views

How can I safely tie the output of a sensor high or low?

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 ...