Arduino Interrupts Tutorial

Dear friends welcome to this Arduino Interrupt Tutorial. In this video we are going to learn how to use interrupts with Arduino, an advanced but extremely useful feature of the Arduino. There is a lot to cover, so without any further delay let's get started!
But what is an interrupt? Most microprocessors have interrupts. Interrupts let you respond to external events while doing something else. Suppose you are sitting at home waiting for the new ESP32 board, you have ordered a few days ago, to arrive at your mailbox. You are very excited so you check your mailbox every ten minutes to see if the board has arrived. This procedure is called polling, and we were using this technique a lot in our projects. But what if we had told the mailman to ring the doorbell at his arrival? This way, we are free to do anything we want and at the time the board arrives at the mailbox we get notified and we can use it at once. This example explains exactly how an interrupt causes a processor to act.
🛒 Arduino Nano: educ8s.tv/part/...
🛒 Breadboard: educ8s.tv/part/...
🛒 Wires: educ8s.tv/part/...
🛒 Buttons: educ8s.tv/part/...
💻 Code & Parts: educ8s.tv/ardui...
Want to learn to code?
👨‍💻 Check my new KZbin channel: bit.ly/3tku2n0
🎮 My Android Game: bit.ly/QuizOfKn...

[@Educ8s]

I hope you took away lots from this video and you managed to understand how interrupts work. Let me know below! PS. WANT TO LEARN CODING? CHECK MY NEW KZbin CHANNEL! bit.ly/3tku2n0

[@paulpixzy5297]

Please ! How can I use this one push button to turn on and off the whole system ,example inverter control board to turn on when pressed and also when off ?? Please help

[@symontorres3952]

Can i adjust the 10 secondd to .5 millis? Using the potentiometer of PIR

[@cw4608]

....so you check your mailbox every ten minutes. Best example of how interrupts work that I have heard. Thank you.

[@DaveBuildsThings]

I've always had a hard time understanding how to use and program interrupts. Best description of interrupts I have seen yet. Simple and elegant. Thanks.

[@joedempseysr.3376]

To show the true power of interrupts write a loop to blink an LED once per second. Then use the same code using the sensor to turn a second LED on or off by interrupt as you have done here. The demonstration will show how you can do two things at once using interrupts! Please show this on a future video. Thanks for all your good work! I thoroughly enjoy your videos! Your pace and explanations are outstanding!

[@theambient1]

"without any further delay let's get started!" I see what you did there... I see it! kudos to you Mr. educ8s!

[@msindisimtengwane9456]

:-) :-D You are a clown :-D :-D :-D :-D :-D

[@nolantaylor1760]

I am taking your tuition seriously. I am creating a control algorithm for an Arduino Nano that has two hardware interrupts(input from Photo_interrupter, and input from Photo Beam detector parallel with a Push_Button switch) 2 Software Interrupts(Counter resets). Thank you for the clear explanations.

[@karlsangree]

Best explanation of interrupts I've heard. It's a well-done video with easy-to-follow instructions. I must admit I had to back up and turn on subtitles on in certain sections. I've worked with Arduinos for a while now and never heard the term "distal pin" before. After turning on subtitles I realized it was "digital pin" and suddenly everything made sense. 😄How is this the first time I've heard this guy? Now I have to check the rest of his videos. Good bye productive afternoon! lol

[@jimstarr5840]

Thank you. I’m working on my first project that is battery powered and was looking for a good way to save power. This is exactly what the doctor ordered.

[@note9redmi17]

Thank you for the great video. For the second PIR motion detect example, it can be simplified by using only one interrupt (digital pin 2) to control the led on/off. The following modified code works very well: #include "LowPower.h" #define PIRmotion 2 #define LedPin 13 void setup() { pinMode(LedPin,OUTPUT); pinMode(PIRmotion,INPUT); attachInterrupt(digitalPinToInterrupt(PIRmotion),OutputLED,CHANGE); } void loop() { LowPower.powerDown(SLEEP_FOREVER , ADC_OFF, BOD_OFF); } void OutputLED(){ digitalWrite(LedPin,digitalRead(PIRmotion)); }

[@Mailmartinviljoen]

Thanks for this explanation. I successfully built an NES controller using an ESP32 that will mimic an 8-Bit shift register. It works on an actual Orgina Nintendo console.😀

[@tbyers31]

This is a fantastic video. Very clear and easy to follow. The pace of your teaching was perfect and the graphic illustrations some of the best to make this understandable. I will apply this technique to a water alarm I have planned. I want the moisture sensor to wake up the arduino and send an alarm via wifi or sms. Thank you!

[@kevinbyrne4538]

Simple, clear explanation of how to use interrupts with an Arduino. Perfect for dummies like me.

[@springwoodcottage4248]

By far the best tutorial on interrupts I have seen & I have watched & read very many. Thank you so much for sharing this which is an extraordinary useful assistance to me.

[@Educ8s]

Thank you very much, my friend, for your kind words. I am glad it was helpful.

[@MJLMICRO]

Very useful information! I was not aware that hardware interrupts could wake the Arduino from a deep sleep and then go back to sleep right after.

[@kasskon]

φιλε πολυ καλος αυτο ηταν απο τα πιο ενδιαφεροντα που εχεις κανει με την μεθοδο των διακοπών γιατι ειναι πολυ χρησιμο πολύ καλή δουλειά συνέχισε :D

[@triac777]

I have used timer interrupts but not hardware interrupts. The hardware interrupts are much easier and more useful. With this video there is no reason not to use them. Thank you.

[@caffeinatedinsanity2324]

Just a little notice at the end part that you could have only used one interrupt on CHANGE mode and if the state of the interrupt pin is high, turn it on. If low, turn it off. It's a good idea to try and save the use of interrupt pins as much as possible, especially on an Uno.

[@Ancipital_]

Good one

[@paulpixzy5297]

Your teaching is unique and clear see how you impact the knowledge I ve been seeking since I come across mcu's interrupt well explaned

[@Educ8s]

Thanks!

[@aleal8]

Well, as many others, I have to say that I really appreciate the way you explain those videos. Very good, thank you.

[@markschuurman4000]

Excellent explanation, thnx! I'm wrestling this interrupt stuff for two weeks now, so I hope your basic setup will do the trick finally!

[@markschuurman4000]

After reading this (www.arduino.cc/en/Tutorial/DigitalPins): Often it is useful to steer an input pin to a known state if no input is present. This can be done by adding a pullup resistor (to +5V), or a pulldown resistor (resistor to ground) on the input. A 10K resistor is a good value for a pullup or pulldown resistor. I attached a 1K restistor from sensor to GND which gave an accurate result.

[@tonysicily2687]

Fast, simple clear and yummy mind PERFECT, This is exactly what I needed to know, not a huge monolithic project, but a simple Arduino is asleep Interrupted - Do action Go back to sleep Perfect 👍

[@dubbadan1]

Well explained. I've not really understood the basics of interrupts till now.

[@shivanngpuri]

I was working on a project of an arduino smartwatch with Nokia 5110 lcd, and this interrupt function would really help in controlling the backlight. Cheers!

[@JahanZeb1976]

Excellent dear friend. Great projects discussed. This was what exactly I was looking for my projects. Keep the excellent work up.

[@ValseInstrumentalist]

I recently learned to use interrupts when learning to program ATmel controllers without the help of an Arduino. It's good to see now how to use them with the Arduino.

[@geomcc39]

Thank you my new friend ! I like your idea of sharing and helping people learn Electronics etc .

[@giannisdrompilis8509]

Grate job! Keep going. Interrupt have an 2 other triggers. The Change and the low. Some models also have the hi. You can do your project using only 1 input and look for change of input state.

[@stevewilliams430]

Nice video I could have done with it 30 years ago when I learned Assembler coding and then swapped to C cross compiler.But this was most informative for the nubbie. Helped me for the Arduino which is a nice IDE.

[@activeacommando]

Συγχαρητήρια. Πολύ καλή και τεκμηριωμένη δουλειά!!

[@fiveooooo]

I'm Italian, I love your English! clear and usefull. Thanks

[@Szurix90]

Thank you for your video! KZbin is for people like you.

[@donaldfilbert4832]

I can see that interrupts are highly useful - and the doorway to programming much more complicated applications !!

[@pauldusa]

yes you can also use INT to be a counter, a water flow meter with a hall effect, or a RPM of a speed of a fan or motor, a IR car counter,,,, many many uses, Thanks for your good video's

[@DogRox]

Great video!! Quite informative! I knew how interrupts work I just never knew how to incorporate the knowledge into the Arduino! :-) I love your explanation comparing it to the mailbox and watching every 10 minutes that definitely sounds like me when I'm expecting hardware!! :-)

[@2150dalek]

Great tutorial, you get to the point fast while being clear....unlike other videos.⚡🐙 I needed this to build a Limit switch for a door.

[@markjlewis]

Thanks for the video, saved me a lot of time trying to figure this out for myself.

[@tserbos2]

μπράβο ρε φιλέ... πολύ δουλειά είχε αυτό το βίντεο!!! πρέπει να σου πήρε εβδομαδα.. με το μονταζ, σπικαζ,κτλ σε ευχαριστουμε που μοιραζεσαι τις γνώσεις σου δωρεάν!

[@Educ8s]

Όντως φίλε αυτό το βίντεο μου πήρε μια βδομάδα να το φτιάξω, αλλά πιστεύω το αποτέλεσμα άξιζε τον κόπο!

[@chetanpandit983]

Outstanding. A concept I thought was very difficult, has been very clearly explained. Chetan Pandit

[@sendoutalerts4537]

a VERY well organized tutorial. i absolutely love all the links! thx for all of the effort!! - a new fan

[@thisoldjeepcj5]

Thanks for explaining interrupts. I will use with photo interrupter for tachometer.

[@shvideo1]

Excellent tutorial, which is very well explained. Thank you for sharing your knowledge.

[@michaelcostello6991]

Fantastic easy to follow interrupt demo. Thank You

[@shivanngpuri]

Hi nick!! Really thanks for all the wonderful and easy tutorial you make!!

[@Educ8s]

Thank you for the nice words! Cheers!

[@szilvesztermohacsi7489]

Hi, I started learning the arduino, and this video very usefull for me. Short, simple. Thanks.

[@chemgreec]

thats great I am building a project and I was going to look into this interrupts. I was watching your weather station project just to get the low power mode(i building an automatic cloth dryer for home) and then i needed to turn tha arduino on and of and there it is

[@savage8336]

I LOVE THAT QUOTE AT THE BEGINNING OF THE VIDEO!!!

[@wduraes]

Another AWESOME video. I'm learning a lot here. thank you for your channel! Keep up with the great work.

[@georgekot6377]

Exactly what I was looking for ! A big thank you . Bravo.

[@jasoncook9817]

Urgh, I was trying to run a program in the interrupts. Thanks for this timeless tutorial, I am now just setting flags and everything works as expected.

[@Educ8s]

Glad it helped!

[@necatee]

Thank you Nick ! Best regards from Turkey.

[@DanMcAfee]

FANTASTIC. Wanting to click the Thumbs Up multiple times...

[@valakatz3967]

Thank you for sharing your knowlage, great video. Only one thing is missing, you should add the schematics this way it will be much more clearer, again thanks have nice day

[@emiltoteb]

Why is it just now I lean about interrupts?! That'll save me a lot of headaches in the future, thanks!

[@wardmd]

Only comment I have, is it would be good to explain/clarify why you wire the digital output of the sensor to TWO digital pins of the Arduino (as opposed detecting and handling BOTH events within the interrupt routine [with the CHANGE parameter to trigger on EITHER sensor state changes]).

[@rooster443]

Where have you been all this time Master! Thank you for this.

[@ajayanchal]

great video !!! just one question. in the second example with pir sensor why there was no need for a pull up or pull down resistor?

[@diego.alienigena]

I have had button bouncing issues. Thanks for this great video.

[@caproni4863]

Thank's a lot for this educational video. I am currently working on a project where this fits perfectly!

[@trr3576]

thanks for all the clear and nice tutorials

[@scootergem]

Excellent tutorial! Thanks

[@kfash5198]

Best Interrpt video on KZbin

[@MrBobWareham]

Love the video as always I found it very interesting but what if when the button pressed it starts a timer to run as a one shot for 30 seconds then goes off until the next button press

[@resonance2001]

That's another great video but may I suggest the use of digitalPinToInterrupt(pin) for the first argument to attachInterrupt for portability? It's a different story for the Arduino Due though. The pin and interrupt numbers are the same.

[@pippaknuckle]

This is really cool. What's not so great is my Arduino only has 2 interrupt pins. Maybe I can learn to use ESP32

[@vikalpas]

I am working on a digital speedometer for my motorbike and would use this to issue interrupt whenever Reed switch senses a revolution completion.

[@blybaly]

Can you make further solid examples with different tools like lcd light control with movement?

[@mitchellcojocariu3363]

Why do you use 2 input pins for the single sensor output? The state will be the same on both pins and it will never send different states at the same time?

[@joemwangi5813]

i needed this for my project, thanks

[@bgable7707]

So, no de-bounce circuit needed in the first example? I'm trying to put together a device which I want to use two buttons to activate different ISRs. However, everything I have read indicates I will have trouble with the ISR firing multiple times with a button switch. Can you give some advice on this? Thanks for all your video's too!

[@jalalbukhari1149]

i want to use these interrupts as a counter for fast moving objects. like seed counter. but i need to know which sensor will be most useful to detect the small grain sized particle to trigger the sensor and cause interrupt.

[@toastrecon]

So, what would happen if the PIR sensor was triggered any time there was motion? Maybe if it not only told you motion but also speed or distance? Would the interrupt "interrupt" itself? Say that the ISR called a function to read in the data from the PIR? Maybe if there were two PIR's?

[@ziathadam8260]

woah, I encounter interrupts in arduino from this video, great job, man !

[@Timothy_Osman]

I'm confused. What is the advantages of using a hardware driven interrupt as opposed to writing if statements in the code that do the same thing?

[@tubecandle]

How much amazing information! Great stuff.

[@Torsan1977]

Very good tutorial! Thank you! I will have to try this on my battery powered projects!

[@oglocop4693]

Hello, great tutorial. I'm having a lot of trouble with accidental triggers. It will probably get better when I solder the circuit together so I'm not using the flimsy female/male connectors, but I would like to implement a solution in the code as well. Is there a way to only trigger it when the button is held down for a second?

[@jacopo.scarpellini]

Is the button in the first example a momentary button? If so, why doesn’t the led only stay on during the short time you press it but instead it stays on until you press it again?

[@amihaiba]

Thanks for the video! as always clear and easy to follow. By the way the quote was originally by confucius and it was slightly different :)

[@mexicanmoustache8180]

great video sir! thanks! finally understood interrupts!!

[@Rolly369]

wow...you improved much on your tutorial, very well done :) thanks for that nick :)))

[@avejst]

thanks for your time to share your knowledge with all of us 👍😀

[@jumbo999614]

Never knew 1 output pin from sensor can be attached to 2 input pin(interrupt pin). I learned something new today. Thank you. Anyway, what is ADC_OFF and BOD_OFF? Also What happen if the sensor output analog value (0-1023) instead of High or Low?

[@ausprobierendannweisstdues8686]

Very well explained thank you, Can you change the time so the length in which the LED lights?

[@MEP_NOTES]

Thanks a lot it is so useful informations and easy to understand

[@brandondaniels9471]

Yea, I never knew this was possible. I'll defnitely use it for my projects if I can. Thanks for the excellent tips! :-)

[@goodwill7643]

I think Arduino calls Interrupt on the end of every loop(), not inside of it. Just try to create your own while(1) and you'll see that attach interrupt will stop working, because you never starting new iteration of loop(). This means, ISR will be called not between command as you show here, but between loop() iterations. So if you have any counter, and for some reason your code is relatevly slow. Your counter will be inaccurate or even skip counts.

[@donaldkormos5529]

Good video ... I learned a lot !!!

[@ClaudeDufourmont]

Congretulations for your video, very interesting

[@koltphillips6724]

AH! This video is terrific. I've been looking for a tutorial that combines both interrupts and sleep modes and this code is so easy and streamlined. Question though, without using a delay, how did you get the motion sensor to wait 10 seconds? Is that just the built in functionality of the sensor? Thanks for the great video.

[@Educ8s]

Yes this functionality in built-in to the sensor

[@koltphillips6724]

@@Educ8s Thank you. You just streamlined my project.

[@mohmhagras]

Thank you. Excellent video

[@TuanNguyen107bvt]

if u left the hand there forever, will LED light up forever or it just do 10s and back to sleep. then check for motion and on again ?

[@WiperTF2]

Thank you so much, finally got an interrupt to work on my Mega 2560 board. Pretty confusing how the "0" interrupt uses pin 2, and so on...

[@prathamva7392]

Very Nice explanation 💜

[@Starwave...3821]

Its a good video ... You did a really good job

[@Educ8s]

Thank you, my friend!

[@TheHoviat]

Thank you very much, that was so helpful!

[@pantoffelheld14]

Hello can you make a video on how to go from the breadboard to a prototype on pcbs?

[@hadihaque4547]

very nice and to the point.Thanks for sharing.

[@Daus-eu9kw]

Informative video! thanks man

[@sumedhburbure4173]

Thank you so much! The video was clear and well descriptive. New Subscriber :)

[@Johncoffee2002]

Awesome - as always !!