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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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7
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1answer
177 views

Troubleshooting Strange Circuit Behaviour…Missing Diode?

I've built this circuit to control a submersible pump with a PIR sensor. The circuit works as expected (the PIR sensor activates the mosfet, turning the pump on) but only after about 30 seconds from ...
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1answer
9k 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 ...
3
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2answers
206 views

Different ways to detect seals? [closed]

I would like to build an underwater mammal detector to take videos of seals when they get in and out of their cave (the entrance of their cave is underwater). It will be a waterproof sealed box with ...
3
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1answer
88 views

Are the PIR sensor modules motion sensors or proximity sensors?

I wanted to make a small project in which the lights of a room can only be turned on when there is someone in the room and it will turn off in absence of any person. I thought of using PIR sensors but ...
3
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2answers
2k views

XBee and PIR sensor

I've ordered XBee wireless transceiver and PIR (motion, here is link) sensor. When I enable DIO0 digital input port on XBee with "ATD0 3" command it becomes high. I measure it with volmeter and get ...
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3answers
1k views

Convert 2s pulse into short pulse to wake up ESP8266

I have an ESP8266 that does something, then goes to sleep. I also have an AM312 PIR sensor which wakes up the ESP when activated. The PIR generates a 2 second long pulse when activated. The ESP ...
3
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2answers
4k views

Faster PIR Sensor speeds?

I am trying to use an array of sensors to trigger a series of stepper motors based on peoples' presence within different areas of a hallway. It is for an interactive kinetic art piece at an elementary ...
3
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7answers
13k 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 ...
3
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1answer
1k views

PIR Detector Controller IC

Honestly, I have a good deal of questions so this may not be for the faint of heart. I will do my best to ask them in a logical order with specific language. I really appreciate the helpful ...
2
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1answer
142 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 ...
2
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1answer
58 views

PIR motion switch

I have been thinking to use a PIR motion switch (originally the switch is aim to open light and used as switch for big current. I saw in the detector specification that: Rated load: 300-1200W So if I ...
2
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2answers
248 views

Making a NCS36000 PIR controller output a distinct and clearly identifiable signal that could be used as a virtual button push [closed]

I need to trigger a peripheral on my existing PCB design. I would use a pushbutton, but can't remake the boards. I need to hack/modify a way in. My MCU is An ATMEL XMEGA and I have a PIR detector ...
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1answer
1k views

How do I get the PIR sensor to output more than 3.3v?

I have a setup where I have a 12V source and a PIR sensor like the one pictured (below) and some LED strips that are rated at 12V that I've mounted under the stair railings. The problem I've hit is ...
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2answers
3k views

PIR sensor not triggering P2N2222

I have this setup where a PIR sensor (HC-SR501) powers an LED strip with the help of a P2N2222 transistor. I then manually connected the Transistor base to the 12v rail and it has no problem ...
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3answers
1k views

Simple USB powered PIR sensor with LED attached to it (no arduino)

I'm new here and I'm re-new in electronic hence why I'm seeking for some help. Last time I touched a breadboard with a transistor was 10 years ago. So, here's my problem and the problem to the ...
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2answers
1k views

0.5 to 4.0 hours Timing Circuit

This is my first electronics project - apologies for the noob question. I wish to control a power relay, trigged via motion / PIR. After the PIR triggers the relay, the relay should stay "on" for a ...
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3answers
227 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 ...
1
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1answer
80 views

Keeping a PIR on all the time

I've just moved to a student accommodation,and they are using sensors to keep the lights in the room on(I'm almost sure that they are PIR). The problem is that they turn off way too quickly and it's ...
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2answers
3k 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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2answers
915 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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1answer
180 views

What are these two components on my PCB from a PIR?

I'm new to electronics, I understand most of this PCB, but the two marked components are a mistery to me, and I can't find their names. The blue one is some kind of switch for the LED, as you can see ...
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2answers
10k views

NPN circuit to switch 12v 1A DC load by 3.3v 1A DC using PIR

I am trying to switch on a circuit using PIR motion detection. I have a PIR module which outputs 3.3v 1A DC when it detects a motion. I want to switch on a circuit rated at 12v 1A DC. I read some ...
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1answer
857 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 ...
1
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1answer
852 views

PIR sensor not working

I am new to electronics and microcontrollers. I am using an LPC1768 and a hc sr501 PIR sensor to create a simple motion detector. I have connected the pins of the PIR sensor to the breadboard and the ...
1
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1answer
53 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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2answers
223 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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0answers
259 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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2answers
506 views

pir motion sensor sensor - working principle

I read about how PIR sensor works. It is written that it has two slots that convert IR energy to electrical voltage pulses. The working principle is to diff between the two slots and when the ...
0
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3answers
92 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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2answers
89 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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3answers
298 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 ...
0
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1answer
129 views

Can this circuit drive directly a led ( or even supply a BJT )

I've this PIR board: https://www.mpja.com/download/31227sc.pdf the chip output has already a 1KOhm resistor in series, so, since the one voltage of the chip is 3.3 V I guess I could connect directly ...
0
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1answer
29 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 ...
0
votes
1answer
123 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 ...
0
votes
1answer
881 views

Waking ESP8266 from Deep Sleep Using a Motion Detector

I'm building a project using Adafruit Feather HUZZAH ESP8266 and PIR Motion Sensor. I have everything working, but I'm trying to reduce power consumption as I'm running it off of a 3.7v/600mA battery....
0
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1answer
175 views

help with circuit design

I have a problem and some of the components I think I need to solve the problem but I do not have the knowledge or understanding to put it all together and what I read online is just not connecting ...
0
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2answers
120 views

Which group do the Proximity sensors belong to?

I was actually doing some research about motion/gesture sensors. well there are different types of motion sensors like : Passive Infrared (PIR), Area reflection type, Ultrasonic, and etc. Well, I ...
0
votes
1answer
91 views

Triggering a LED and interrupting it quickly (with a PIR sensor). What do I need for this?

I'm an artist working on a interactive installation. I'm a beginner in electronics and I'm feeling a little bit lost here, can you help me? I have a 5v circuit with a PIR sensor activating a LED and ...
0
votes
1answer
160 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
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2answers
458 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
1answer
187 views

PIR Op amp circuit voltage gain question

I have come across this circuit on a mock paper, which is asking me to find the overall voltage gain of the circuit, it is a bit of a scary looking circuit and i'm not quite sure where to start, any ...
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3answers
216 views

Using PIR 3.3 V 0.33 mA to drive 12V 4A valve coil

I've been looking at ways to drive a 4 A, 12 V solenoid valve from a tiny, 3.3 V, 0.33 mA (max) current output from a PIR module. Whatever I try (MOSFETs, transistors etc), there never seems to be ...
0
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2answers
1k views

Designing a low power PIR

I'm trying to design a low power PIR motion sensor, but there seems to be a dearth of information about it. I know how the pyroelectric sensor works, and I know what the waveform looks like, but how ...
0
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1answer
96 views

PIR Sensor University Project

I'm working on a project to use PIR sensor to save on electricity bill in a university, almost a fresh graduate in Electronics Eng. Load is Fluorescent tubes 44w each via ballast,there will be ...
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0answers
19 views

can i modify hc-sr501 PIR sensor to work only at night?

i see that i can add ldr to Hc-sr501 pir sensor so it will work only at night,the output become high for a certain period if any motion detected . can i modify it so the output become always high at ...
0
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0answers
33 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 ...
0
votes
1answer
41 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
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0answers
38 views

Joule Thief powered HC-SR501 PIR Motion Sensor & LED string

Following BigCliveDotCom's YouTube video, I was able to build a joule thief. I then built a HC-SR501 PIR Motion Sensor lighting a 4.5v string of LED fairy lights powered by either a 5v wall wart. or ...
0
votes
1answer
136 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 ...
0
votes
1answer
65 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 ...