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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30 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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42 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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51 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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61 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
21 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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49 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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96 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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46 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
112 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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71 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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6 views

HC-SR501 PIR Sensor timer adjustment seems to have no effect

Is anyone who is familiar with the HC-SR501 PIR module been able to fine-tune the output time adjustment? I am targeting a signal time of 10 seconds. Module data sheet: https://www.mpja.com/download/...
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39 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
80 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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59 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
53 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
79 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
60 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
94 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
180 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
466 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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2answers
391 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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1answer
440 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
215 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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385 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
79 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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2answers
949 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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3answers
96 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
178 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
294 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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321 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
208 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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1answer
1k 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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1answer
95 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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199 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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2answers
157 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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3answers
2k 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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1answer
275 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
928 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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1answer
441 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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216 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
60 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
619 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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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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315 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
96 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
215 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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545 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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4answers
4k 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 ...