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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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 ...
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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 ...
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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 ...
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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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137 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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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 ...
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186 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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231 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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37 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 ...
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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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1answer
990 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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457 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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258 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
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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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 ...
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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 ...
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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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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 ...
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3answers
297 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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159 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
135 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
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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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
141 views

Is this circuit safe?

What the circuit does is very simple: once the PIR motion sensor detects a motion, the OUT pin is high (3.3v) and it will put the MOSFET in an open state. The LED strip will be therefore on. It's ...
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355 views

PIR motion sensor with MOSFET, optocoupler or Relay to turn on LED ribbon

I made a small circuit (with a breadboard) which turns a small 12V LED ribbon (a few mA) when the Pir sensor detects a motion. The circuit is made of: Velleman PIR motion sensor Relay Velleman step ...
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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 ...
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1answer
238 views

Is the '0V' on a non-isolated buck converter the same on the input as it is on the output?

I'm working on a project where I want to switch a load (utility LED light, +- 20W) using a motion sensor. The PIR can only operate at a maximum of 12 volts, while the load can be operated at a voltage ...
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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....
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203 views

Long Range Motion Detection solutions

I'm trying to find solutions for the security of an outdoor area (2km long and 1km wide). We want to detect any breach through the borders of the area, if someone sneaks in and/or someone goes out. ...
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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 ...
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2answers
914 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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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 ...
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233 views

Noise in battery powered circuit

I have designed a circuit that uses the TI CC1310 microcontroller, and has a daughtboard that has the PIR sensor and amplification circuitry from the from the TIDA-00489 http://www.ti.com/tool/TIDA-...
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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 ...
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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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25 views

Is there a standard to connect PIR sensors to own hardware?

Does anybody know if there is a standard to connect PIR sensors to own hardware. E.g., I've seen that V+, GND, VIN (with load resistor) are required, but is this all?
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408 views

Can you explain the resistors in this PIR circuit?

The circuit is a motion detection alarm circuit, I know what the circuit does but I want to know about the resistors attached (R2 is attached to the transistor for amplifying the output to 5V). Why R1 ...
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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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198 views

9v security sensor convert to power pack

I dont have a lot of smarts on circuitry design, so this is more of a can i do it, and what should i look at using or is there is a current solution. basically we have some wireless PIR's with our ...
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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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2answers
687 views

PIR Sensor + LEDs with no additional Microcontroller [duplicate]

I'm thinking of building a project that would only include PIR sensors and LEDs. Could I use a PIR sensor like this one, https://www.adafruit.com/products/189, to power 8 LEDs or would those 8 LEDs ...
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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 ...
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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 ...