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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74 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 ...
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40 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 ...
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189 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 ...
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249 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? ...
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6answers
744 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 ...
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66 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 ...
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1answer
385 views

Connect 240v PIR motion detector to Raspberry Pi

I want to connect a 240V PIR motion detector directly to my Raspberry Pi 3. Inside its plastic case I found 2 PCBs. One is the power supply board which has a 24VDC relay, a S9013 NPN transistor, ...
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1answer
36 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 ...
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2answers
1k 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 ...
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1answer
32 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 ...
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5answers
61 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 ...
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74 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 ...
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3answers
235 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 ...
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57 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 ...
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1answer
804 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 ...
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1answer
40 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 ...
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43 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 ...
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1answer
149 views

Is one of my multimeters wrong?

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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67 views

how to connect PIR sensor to arduino using RS485

I have to connect PIR sensor HC-SR01 to Arduino using RS485 such that PIR sensor's TTL signal gets converted to RS485 while transfer and gets converted back to TTL while receiving on Arduino side. ...
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52 views

Hacking a PIR Sensor

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 ...
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2answers
500 views

PIR sensor (HC-SR501) with n-Mosfet transistor not switching off

I have none to less electronics background, with limited knowledge whatsoever. I've used some schematics from the internet https://www.youtube.com/watch?v=ugDPdgGekNo to put in place the below setup : ...
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47 views

How to stop electric fluctuation while using PIR sensor

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 ...
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1answer
48 views

Is it possible to use a PIR detector to switch something on and keep it on without a microprocessor?

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 ...
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1answer
473 views

How to trigger a Low-level relay with PIR sensor? [duplicate]

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/...
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617 views

Triggering 12v Relay with HC-SR501 PIR sensor

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 ...
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1answer
25 views

Which N channel mofoset should i use for PIR sensor to turn on LED strip 12v 6A

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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4answers
5k views

PIR sensor led strip with N channel mosftet

I have a PIR sensor (HC-SR501) and I want it to turn an led strip(12V 0.8A) on when the sensor detects motion and off when there's no motion. I checked a previous thread which is similar in that ...
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0answers
58 views

Supply current of Nanopower OpAmp

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, ...
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47 views

What kind of sensor could this be? (Also recommended sensor for detecting the entry of vehicles)

Any idea which sensor this might be? It is being used to detect the presence of a cold and ferrous vehicle, in this case a truck passing by, with minimum speed 1km/h and max speed 5 km/h. Also would ...
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1answer
535 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 ...
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2answers
1k views

PIR sensor 3.3V output driving a mosfet loaded with 24V power LED

I'm trying to build a cheap motion activated LED light system. Circuit is: 24V power --> LED --> LED --> resistor --> (drain) mosfet (source) --> GND LED are 10V 10W on aluminium heat sink, resistor ...
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130 views

How to use pir motion sensor to light up 3.8v dc bulb using battery and relay

I would like to detect motion to turn off my 3.8v 0.3A dc light bulb using pir motion sensor. Recently I tried to connect it with 5v relay, arduino uno and 2×3.7v li ion battery and the bulb seem to ...
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0answers
45 views

How to blink LED using NodeMCU in Arduino IDE?

I have alredy installed ESP8266 package in my Arduino library. I connected d0 pin of NodeMCU to LED's positive terminal and ground pin of nodeMCU to LED's Negative terminal as well as I uploaded blink ...
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1answer
120 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 ...
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0answers
87 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 ...
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1answer
79 views

Turn on LED strip via PIR using NPN transistor

I have following circuit. Really simple. But I keep missing why I cant power LED strip (5V 1A). Falstad simulator says overflowing current. I am not very good at simple hardware thing. I often solving ...
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1answer
124 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 ...
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1answer
2k views

PIR (HC SR-501) not working

I'm working with ESP8266 Wemos D1 Mini and HC SR-501 (PIR sensor) in one particular project (please, see the circuit image in annex). The question is the HC SR-501 stay always LOW. I tried change the ...
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0answers
458 views

Retriggering 3V PIR sensor with 555 timer circuit and LEDS

Hi y'all I'm putting together a PIR sensor circuit that will trigger a 555 timer in monostable and run a set of LEDS for about 5 sec all on a 3v cr2032 button cell battery and than reset until next ...
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1answer
62 views

PIR Sensor for bulb in room

This has been very long since I left electronics but recently I restarted taking interest in it as hobby. I bought some PIR sensors from Aliexpress and found it is very simple to implement if I have ...
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1answer
10k views

How can I amplify PIR output to 5V

I need help with a project. I want to make a circuit to work as a night-time motion detector circuit that will power several LEDs. I bought: 1 LDR some NPN transistors BC547 and 2N3904 some resistors ...
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7answers
22k views

PIR sensor always gives HIGH

This is my first time to use PIR (HC-SR501 ) . It's in repeat trigger model. But when I test the output of the PIR , it gives always HIGH . I rotate sensitivity adjustment and time delay adjustment ...
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2answers
98 views

How do I model a digital out in a circuit simulation?

I have a PIR: Panasonic NaPiOn AMN34112 that has a digital output. When it detects motion it outputs 4V and 100 uA max. I want to connect this output to a LED using one or more transistor amplifier ...
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1answer
251 views

Need help connecting PIR to LED

I have a Panasonic Pir Motion Sensor (AMN34112.) I want to connect it to a LED so that the LED lights up when the sensor detects motion. I need some help to make sure I do not destroy the PIR. The ...
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3answers
618 views

How to switch PIR sensor on/off based on photocell result

I've built the following circuit based on an ATtiny85 for a night lamp. The circuit is powered by a 3.7v LiPo battery. I'd like to turn off the PIR sensors when the photocell detects light in order to ...
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1answer
276 views

PIR HC-SR501 and TIP122 - TIP 127 heating problem

I'm having a problem with a circuit commanded by a PIR. I managed to ring a chinese doorbell when someone pass in front of the PIR but the main problem is the two transistors become very hot and I ...
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1answer
86 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 ...
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3answers
100 views

How do I keep the “detected” state ON in a PIR detector until a human has left the detection area

A PIR detector stops alarming after a while, if a human in the detection area doesn't move. How do I keep the alarming state ON as long as there's a human in the detection area even if he doesn't move?...
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1answer
241 views

PIR Sensor triggering voltage not enough

I'm using a HC-SR501 PIR sensor. The sensor is working fine, it outputs 3.3 V on motion detection. But when I connect the PIR sensor to pin 2 (interrupt) of an Arduino pro mini, the voltage output is ...
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3answers
327 views

PIR sensor outputs HIGH for too many seconds

I've a pretty simple set up which consists of a PIR sensor and ESP8266. This PIR sensor outputs a HIGH value when presence is detected. This HIGH value lasts for 8 seconds. I want this trigger to ...