How PIR Sensor Works and How To Use It with Arduino

howtomechatron... ► Find more details, source codes and circuit schematics here.
In this Arduino Tutorial we will learn how a PIR Sensor works and how to use it with the Arduino Board for detecting motion. You can watch the following video or read the written tutorial below.
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Music: Aduro by Jens Kiilstofte (machinimasound.com/music)

[@weekendprogrammer7545]

I have been using PIR sensor from long time I did not know that repeat and Non-repeat thing. Good one bro.

[@NAtira-yg9fu]

Where were u been using it

[@apotre1207]

@@NAtira-yg9fu nowhere

[@Canadazeus]

Excellent tutorial. I finally get to understand how to use something without further research. Thanks.

[@mikeearls126]

This guy sounds like an extremely smart version of Borat.

[@sophia-tj1ck]

I'm new to pir sensors. Can I use 4 pir sensors with one Arduino?

[@ITLBGaming]

Somebody didn't get this comment. I understand, and I agree. Very nice

[@johnmax8829]

hahahahahahahahahaha

[@zero3905]

@@sophia-tj1ck yes

[@bartdelabarre3432]

EXCELLENT! I want to make a motion activated sprinkler to keep deer out of our garden AND wanted see if an Arduino or PI would be of any use in the sprinkler contraption. Your video nailed it. THANK YOU!

[@HowToMechatronics]

Glad you found it helpful, cheers!

[@Tech_Brigadier]

hello sir after watching your video I thought if I can use a PIR sensor instead of an ultrasonic sensor in obstacle avoiding car will it work or it will keep crasing

[@agstechnicalsupport]

Good explanation of PIR sensor activated electronic circuits. Thank you !

[@ganis6020]

Dejan i LOVE YOU and YOUR WORK !

[@ilhamrhomadony326]

thank you very much for your tutorial, its so helped

[@bad63r31]

U 4 ujutru ja naletim na tebe :) Hehe predobro radis posao, samo nastavi iako trenutno mozda ne poprimas dovoljno paznje koliko bi trebao.

[@karenberry9498]

This is a great tutorial, thank you very much... John :)

[@speedogonzales7863]

Thank you brother good job

[@ForgottenLegendsOfTomorrow]

what do you mean about non repeatable trigger? can't understand. an example would be helfpul

[@charleslyell3748]

Repeatable trigger: every time the sensor detects a movement, It resets the timer to zero. Otherwise, the timer starts counting after the first detection and posterior detections will be ignored.

[@HopeIsAlliGot]

Thanks my genius..... this video is soo knowledgeable.....

[@kunaldhar6713]

Mate, can the same happen using ir reciver led?

[@sagirkhan6805]

Very Nice Video, explained very well..Thanks a lot

[@sajeebiqtiyar206]

Very good system.. Alhamdulillah... Thanks sir

[@brownmunda7200]

is there any method to reduce the delay time to 0 so we can take continuous inputs?

[@umxrr8677]

Change the jumper to other side

[@larryzhang3446]

Dear friend, can I use part of your video in my company on-line seminar? I'm not sure if I can get your reply here, but look forward to your answer.

[@ChintuPrasadChin2pra]

you have provided wrong source code as u defined only if statements thats why relay will never turn off if it switched on first time you must declare else statement to turn off relay. just recheck your source code

[@gamestv4875]

This would make for an interesting intrusion detector. But I am scared if that thing detects something in my room other than myself and I can't see shit ...lol Nice tutorial , thanks

[@NextLevelCode]

I guess it's better to die not knowing what's coming then? lol

[@maza6357]

You can run the sensor directly with relay module or use a transistor in the middle because the sensor board has enough controls for distance and time even giving logic signal as output. However if the application requires processing or running a certain control schema with multiple sensors Arduino will be required. Arduino will take care of all timing and trigerring, only the distance needs to be adjusted at the level of sensor board.

[@cristian-bull]

Depending on the relay module and the sensor, it could not work. Some sensors have a 3.3v output. Besides, the relay in the example is active with a negative input. Anyway, the Arduino can be replaced by a transistor ._.

[@yudikurniaadiputra5766]

I want ask if we stop our motion in front of pir sensors, the light will still on or off? And how to set a pir sensor so they wouldn't detect any kind of thing except human? Thanks for the answers :)

[@MrNams]

My hc-sr501 gives always high output, what is issue?

[@nateF888]

thank you so much for this!

[@rafaelgacura3461]

What is the maximum range of this sensor?

[@stlittleteresasghssvaikom3573]

Thankzzzzzz very much............

[@koupohroyandredavid2639]

bro, what is your config for sensitivity and delay time on PIR???

[@mobinwb]

They are hardware configured..2 potentiometers on the sensor PCB..Its mentioned in the video itself

[@AzeezAbdul-iv2sr]

00:03 IR sensors come in various package sizes. 00:53 Understanding the physical differences between IR receiver and transmitter 01:37 IR sensor detects objects by reflecting IR rays. 02:31 Voltage level depends on reflected light intensity 03:09 IR transmitters have limited range for detection purposes. 03:54 IR sensor detects objects based on reflected rays 04:34 IR sensor detects variations in reflection based on screen brightness 05:13 IR sensor detects different voltage levels for different colored lines Crafted by Merlin AI.

[@anytimecinema459]

Thanks a lot for making this tutorial, and making everything clear in just 4 minutes :)

[@tomjackson532]

saved my ass for my robotics essay!!!

[@woolfy02]

Very cool! I've been trying to build a remote-controlled relay with camera (Through hardware or on an Android app). Basically, you could remotely connect to the pi / Arduino camera anytime and, hit a button that controls the relays action. Does anyone know of a similar project guide / tutorial? I ask because, I'm struggling trying to build it myself.

[@thaik56]

Good to know this type of motion sensor doesn't emit radiation +1 for well designed technology.

[@fayazdharwad5999]

Make another one but clear explanation red, black wire expiation, will it requires DC supply or not pls

[@shivamsahil3660]

I really needed this thanks buddy!

[@LeonardoValente_]

I love your videos !!!

[@LeonardoValente_]

I'm about to buy my first arduino and some sensors , what's some cool projects you recommend me to do ?

[@fatimaghaddar3862]

Hello, Im new to PIR sensors, can we adjust the sensitivity to be less than 3 meters? Please respond :)

[@eliasibrahim1055]

Thank you very much for making such a great tutorial.

[@muhammadqaisarali]

Well..good explanation, but I am confused for 1 thing, why Arfuino is present here...as the pin can be directly connected to relay Module

[@navadeep025]

Just because he had a spare!

[@hossammoghrabi1021]

can you tell me where did you get the music track and what is the name of it? thanks

[@neutron1969]

Ubedljivo najbolji tutorijal koji nadjoh na netu u vezi PIR-a. Hvala najlepse!

[@Michleone]

Will it stay on if your hand is stationary?

[@coolkid9770]

what was relayInput? what does it do?

[@ColinRichardson]

I presume you could do this without the arduino? Have the out on the sensor connected to the trigger on the relay and change NC/NO for the lamp? Just need a 5v source to power the relay and sensor?

[@joaocarloslira1367]

Very nice tutorial!! Considering this same code, is it possible to add mutiple PIR sensor in parallel to trigger that same relay?

[@joaocarloslira1367]

I appreciate your answer, I am gonna work on it.

[@SamirSogay]

Awesome video

[@Saraikinaat871]

Bro ...ur code is so simple and i was searching lke this....thax.special thax

[@blackpanther4656]

What are the things they used

[@Saraikinaat871]

@@blackpanther4656 Seee vedeo

[@jeffcarpenter7721]

thank you i was looking at changing the sensitivity on mine its exactly what i was looking for, here for an edit i always get motion no matter the settings for delay or sensitivity? not sure why

[@fotobluzz9217]

hi. is it posible with this Pir sensor to do some other activation of light. first detection on and stay on until seconde detection. i mean as hand wave in front of pir sensor. or it woud be better to use proximiti ir sensor. same first detection to on and stay on after secons detection. thank you.

[@krishnakumariyer4579]

Excellent know-how on PIR sensor Dejan. It was quite enlightening. Looking at your vast expertise in such devices, I would like you to do us enthusiasts, one more favour. There is this device "Omron D6T Thermal Sensor", which is also based on sensing the body heat, but better than PIR sensor, as it does not require motion to occur, to get triggered. The advantage is that as long as the human is in the frame of view, it stays triggered, unlike the PIR sensor, where if the human stays at one place without moving, the sensor is not able to sense the human presence. I have been looking around the internet for some help in using this device, but could not find any proper resource. Would appreciate if you could teach us to implement this device through a suitable project. Your teaching technique is very easy to understand and would definitely help everyone in getting to know this device and using it successfully. Many Thanks and keep up the good work.

[@OliverONeill]

That is way overkill.. you can replace the whole arduino with a resistor and NPN transistor (to buffer the signal) instead. In fact you might be able to drive the relay board directly from the logic output of the PIR sensor, since the relay board is probably already buffered.

[@OliverONeill]

***** Thanks for repeating what is already known. I'm just giving the correct way of doing it. As a teacher it is the up to them to teach them the correct way of doing things, and avoiding bad habits like this one. This entire "tutorial" is a bad habit. I understand it's to learn about the arduino, then make a video about how it works with shields or something.

[@leomardo2285]

+Oliver O'Neill Are you able to show how to use this sensor in low power battery operated applications. I have a project where I need to detect motion and pulse an LED for obsticle avoidance.

[@BortPlate]

+Oliver O'Neill - The video is titled "How PIR Sensor Works and How To Use It with *Arduino*", not "How to use a PIR sensor and a relay to turn on a lamp". Yes, the Arduino is not needed _if your project has nothing else_. Thank's for stating what is already known! Note how Dejan did not say "It's a good habit to use microcontrollers as an intermediate between PIR sensors and relays". Again, Dejan is just explaining _how to get started with PIR sensors using an Arduino._ Perhaps an LCD could be added, or WIFI, or whatever. Read the title once more if you're still confused.

[@wasuuu]

'As a teacher' xD.

[@wakwaobapa6709]

Can we use this for spesific objek?

[@sangitasrivastava172]

Can we make rhe same thing with Arduino Nano?

[@lalithadityanaidugajula]

why PIR sensor cannot detect the body by the centimeter..please answer

[@rambilasmeena8306]

इस सेंसर को कौन कौन से सर्किट बनाने में उपयोग कर सकते हैं ।

[@ghaint_remix]

Bro it's not working at all I follow same steps to make it but it is not working I also use Arduino mega But please help

[@koushikchakraborty4541]

can I sense a particular temperature with this project ? if yes then plzz reply me how .. thank you

[@CrazyCoupleDIY]

no

[@bambino16]

Anything is possible but idk how

[@boolfnasa2582]

Why do you need to move your hand if this works on IR -> Heat , so why moving?

[@caramba10]

Why is an Arduino necessary? couldn't you just take the output from the pir directly to the relay board input?

[@cristian-bull]

The Arduino code is trivial. You could use a BJT transistor to replace it ._.

[@BuckyARNP]

He won't reply. Don't even try. I've done four comments already and he hasn't replied.

[@BuckyARNP]

Trust me. If he does, it'll be insane.

[@cristian-bull]

My comment is not a question, it´s not ment to be replied D:

[@BuckyARNP]

oh sorry

[@patchoulino]

You can also use black magic for that

[@bskscienceresearchindia7415]

Brother thankyou

[@neelabhmadan6820]

What is the sensor's range?

[@Pandafoot1]

May I ask you to give a fact based assessment about using the PIR sensor with either Arduino or a Rasberi Pi. The PIR is basically used in security situations and I seem to find only Rasberri Pi board uniting with PIR and exhanging through GSM WITH sms to cell phone notification

[@johnossi4234]

Good tutorial. How do you read out the untriggered real time sensor output?

[@xall1e]

+John Ossi It returns either "motion (1)" or "not any motion (0)". Something like this would do the job :) #define pir A0 #define led 4 void setup() { pinMode(pir, INPUT); pinMode(led, OUTPUT); Serial.begin(9600); } void loop() { int val = digitalRead(pir); digitalWrite(led, digitalRead(pir)); Serial.print(val); Serial.print(' '); delay(100); }

[@loriroslawski6561]

searb .m seàrch

[@zoegnappe]

@@xall1e bulshit code

[@mfdares1809]

First things first.. great tutorial... well done.. Since there is so much demand for a minimalistic working motion sensor tutorial (without Adreno)... Could you please make one... and share it. While making the tutorial.. MAKE SURE THAT YOU KEEP US IN MIND..... WE KNOW NOTHING ABOUT CIRCUITRY (NOT EVEN Soldering, OMs, resister, etc...). So,I request you to kindly make a real simple tutorial for us....if possible a minimalist one, without resister, OMs and a lot of explanation. Also make sure that you share your tips and tricks And the mistakes you did (so that we don't repeat them). I did search the internet and KZbin.. But couldn't find a tutorial with simple design and instructions. if anyone knows of such tutorial, please share the link. I'm planing to power a 5050 led strip with 12V, 2.5 or 5 mAh battery, Activated by this motion sensor.. If possible please let me know the minimum things required for this project.. ( right now I've got 1.battery, 2. Leds, 3. PIR motion sensor.)

[@imnotleoz5486]

omg , thank you so much! I was trying to write a code which will enable the LED to be on as long as there's movement!!! now I'm going to trying the repeatable mode that you just mentioned to see if it really works without changing the code !!

[@RAHULSHARMA-rd3yz]

does it work??

[@siuharry5881]

Can I use PIR sensor under sunlight?

[@charleslyell3748]

It must be protected from direct sun light.

[@orhanyor]

posting if anyone is having a problem. code partially worked, lamp turned on and never turned off. i added next piece of code right after first if condition and now it works fine. this way we properly send a signal to the relay. if (sensorValue == 0) { digitalWrite(relayInput, HIGH); }

[@bharatsutar6078]

Does this sensor detect non moving human body ??

[@BiswajitPaul66]

Can I use it in jungle to track any human movement?

[@uditsaxena3844]

Sir i have a question can we detect sun 🌞 rays also with it ?

[@skibsted123]

with this set up, not sure, but there are mutiple sensors that can detect sunlight. the sensor in this video is mostly for infrared light

[@aglan]

Is there a way to dim the light for example if PIR sensor detects an object then the light will go ON and keep it on for sometime. Now if there is no object for 20 minutes, instead of turning off the light but dim the light instead for like 30 to 50% instead of 100% ON. Thank you.

[@priyadarshini8589]

can u send the circuit diagram sir

[@hariomparajapati4900]

Can it activate hot air or other hot object can we use 4-5 pir sensor to cover 360° area

[@vrangarajan7623]

Check in Amazon there is a product by Blakt Electrotech which can connect multiple PIR sensors upto 1000 Watts and it is just Rs.199 or so.

[@kevinsymss8373]

Hi , What is the range ?

[@matyi1656]

The Arduino is really needed at all here? The PIR board doesn't give out a high enough voltage to drive a relay?

[@danielcomparan1272]

How can I do so that the PIR does not start with every thing or person that passes infront of ... ? for example, i need that when a car pass in front the pir put in high but not when a pet or a person pass.

[@danielcomparan1272]

Dejan Nedelkovski thanks, i think that it's better using the ultra sonic sensor like a radar and do a database

[@DuneKraftwerk]

Why you move your hand trying to trigger the sensor if this IR sensor detect heat ?

[@danielodors]

Because knowing electronics doesn't mean he knows physics.

[@beetlefly9718]

I have a pir sensor but the washing line sets it of?? That’s not heated!

[@1NATURELOVERJ]

Great video. I am working for the state of Florida. I set up dslr camera traps in south Florida to capture pictures of our endangered Florida panthers. I am looking to have made a couple motion activated units that will trigger cameras to take a picture, or series of pictures. I am not a electronics guy, so I couldn't build a system. Would you be interested in making a couple sensors for me? And if so, what would be their cost? Thanks.

[@skeeterburke]

it's pronounced fruh NELL cuz its French so its not FRES nell or whatever it looks like. the s is silent. nobody but us snobby physicists give a crap, but if you want to pretend youre a smarty pants physics snob, you can correct your friends when they mispronounce it which is always, from what I gather

[@matuskunik2068]

Hi ,nice example ,but didn´t work for me with arduino nano. i solved it, with simple connect the PIR output,directly to input of the relay board, and everything work as excpected. So, you don´t need arduino for this.. simpler and clever without arduino...

[@nileshsurwade6976]

when i sense my PIR sensor continuesly then i want continues ON of output of PIR sensor but this is not happening even i select the repeatable trigger..What is the solution

[@salvadorcantera1848]

can you make a code for a ultrasonic sensor?

[@kennmossman8701]

But you assuming the PIR will be close to the uC. What if the PI is say...30m far from the uC?

[@junaidhkv4153]

How to avoid animals in pir sensor(only human detection purpose) Any idea ? Any other sensor? Please reply

[@furqanali9967]

If I want my light on delay timeat least 1 hour by Arduino how is possible plyzz Tell me sir thanks?

[@TheUnknownCatWarrior]

The sensor can be directly connected to the relay module

[@EdaNavarra]

Thank you Sir

[@isprithul]

This code should not work, because you are pulling the relayPin low, you are not pulling it high when the object is gone. So the lamp will stay turned on forever

[@algebraguy]

Good day, I am one of your best subscribers and supporter. Would it be ok to ask where can we buy this project?

[@cambodianriverpig7613]

Can you use the Pyroelectric sensor for thermal vision?

[@PatrickGuerrisi]

Whats the difference between PIR and IR from a surveilance camera

[@the_darkguitarist6106]

Pla make a tutorial on pid line follower

[@dinil_TCR]

Sunlight generates IR waves then how it identify humans among that?

[@MidasTsai]

The PIR, If the person is still standing, it won't detect. Can have any solutions?

[@fisslewine1222]

But is there a way to alter it to detect large animals instead of any movement, as even house hold spider can set them off!

[@amr.3k]

Nice, simple illustration. Thanks

[@karenberry9498]

Hello, could you please let me know, how can I switch on some 12v led without arduino? Thank you very much... John :)

[@karenberry9498]

+Dejan Nedelkovski Ok thank you for your reply, I have just bought some Mosfet IRFZ44N I hope one of these might work, I just need to search for a schematic!.. Dejan if you come across one could you let me know. Your help is much appreciated, Many thanks... John :)

[@moehein899]

My repeatable trigger doesn't work. How to fix?

[@borisloncar3011]

I have a Solar Lamp with a PIR Potion Sensor and a remote control with which I control the light. When I press Mod 1 ro on the remote it means that the light will turn on via the PIR sensor. when I get close to the PIR sensor the light turns on and automatically turns off in 20 to 30 seconds. My lamp has a Frenzel lens as you said in the video.