Interrupts, Interrupts everywhere! Make any Pin an Interrupt Pin on your Arduino - Tutorial

Sometime you need more than the 2 included Interrupt Pins on an UNO for your project. Let's look at a simple way to make any Pin an Interrupt Pin!
The schematic, parts used, library, etc... is available on our Tutorial page at: brainy-bits.co...

[@beatsbykabuki]

Thank you for the clear and concise explanation. Subscribed :)

[@skrame01]

You should always discuss compatibility, with other libraries, functions, and hardware, shields.

[@thecount25]

I want the ground pin to be an interrupt.

[@RSP13]

hahahah

[@RandomPerson494-12c]

Destroy ground pin of your ATmega____, Your pin will interrupted forever .

[@robytryall]

Died 🤣

[@tungha9781]

Thank you for your library!

[@dellodel9502]

Realy thanks I was searching for it for a long time. ⭐⭐⭐⭐⭐💯👍

[@capistor1]

I Don't recall you mentioning this important point about the library. the library only lets you choose either external interrupts or pin change interrupts. but if you choose pin change interrupt and you have an uno that means the interrupt is triggered on port state change that means it doesn't just look at the pin you have specified instead looks at all the pins which are part of that port. so i am not sure how this would be useful if you are using your arduino pins for different things.

[@ajeethsuryash5123]

Thanks man... Helped a lot... Impressive tutorial...

[@qzorn4440]

nice superman t-shirt.... great video... thanks a lot...:)

[@softa74]

Can the analog pin be used as an interrupt, such as a potentiometer? Thank you

[@harrywhite7287]

Very cool. Thank you.

[@ronjones4069]

I thought you could not do a delay() inside an interrupt. You can do a delayMicroseconds(), however, and a for loop can extend the pseudo delay to anything you reasonably need. But, I may be wrong.

[@acatisfinetoo3018]

Can i make the "analog" pins an interrupt too?

[@markconger8049]

Thanks for this lesson! Would it be possible to use an interrupt pin for receiving input from an infrared remote control rather than using case statements in the main loop?

[@memphys316]

dude - use the autoformatting feature in arduino IDE - it makes things prettier and easier to read.

[@LarryGreen]

Very well done, subscribed as well

[@BrainybitsCanada]

Thank you for the comment and for watching!

[@BrainybitsCanada]

If you want to play around with the library we used in this tutorial, you can find it here: github.com/GreyGnome/PinChangeInt Thanks for watching!

[@akroutsamo]

+Brainy-Bits this is a helpful tutorial a suggestion : can you make a tuto about active temperature controller using arduino , Dht11 a 5v/12v fan and a relay to activate heating element and use the Lcd along with the buttons or with rotary encoder to set and control the temperature or with a TFT touch screen ;) it's about how we could make an arduino menu : user interface i hope you find this interesting thanks (y)

[@BrainybitsCanada]

+Akrout Osama Thanks for watching and for the suggestion! Will make a note of it for an upcoming tut!

[@tuber4tuber]

+Akrout Osama I agree, this would be an interesting project. Thank you.

[@רוניפינקל]

the library not working

[@janmacku4633]

Thank you!

[@dellodel9502]

First of all thanks for every things you gave us ⭐⭐⭐⭐⭐. I have some ATMEL uC from trash and i would lik to program them but i don't know the value of their crystal !!. If i want to reprogram them using the SPI protocol , the clock pin will allow me to do it? ( without knowing the value of the clock). In other way the clock pin of SPI protocole will replace the crystal clock ( at least during reprogramming operation ). Thanks.

[@borayurt66]

Hardware interrupts vs software interrupts... I wonder if there is a difference between them? I am just guessing here but, would hardware interrupts would work simultaneously, while software ones would wait each other to complete their assigned tasks?

[@rodmanunderhilliii8198]

Just what I needed to control 4 DC motors. I was thinking I could possibly use A0, which is D14, as a interrupt. Has this been tried, with any success? I'm using a 293d motor module and I'm all out of the usual 0-13 digital outputs. Thanks for showing us to the interrupt library.

[@hrpproductions53]

bro, how to disable the interrupt of those non interrupt pins after making them as interrupts

[@RonFinlay1]

This was great, but what if you have 400 lines of code for a variety of LED rings, input switches, LCD display driven by encoder menu selections? Does your pin 11 or other interrupt work as fast then? I know it's not visible on this simple sketch, but more complex ones may show what's really happening. Great video nonetheless

[@paulmichaud3230]

Interrupt Service Routines (ISR) should be kept as short as possible and only perform a few bare essentials before returning. They generally are divided into a "top half" and "bottom half". The top half performs the necessities, while the bottom half is code that can be performed after the ISR has returned. 400 lines of code is not something an ISR would do. The implementation is too much to be explained here.

[@BrainybitsCanada]

Hi everyone! The Tutorial page with the Schematic, Code, and download link for the Library is available now at: brainy-bits.com/tutorials/ Thank you for watching!

[@tuxcode7344]

Thanks for sharing.. But please indent your code and use one statement per line. You may be familiar with this code, but someone else may not be. This is pretty difficult to read this way. :)

[@GerardWassink]

Hear, hear!

[@kennethd.bryant9279]

I also have several of the smaller boards and no bootloader on them either... I have three FTDs but none work with the instructions that I have found, so far

[@photogyulai]

How do You do this?!? :-) If i try any internet tuts for rotary encoder the output value changes like crazy... up and down >> even if i rotate it only one direction. In your video is it just atom precise!! :-) For me sometimes it jumps from ~20 to 80 in two "cliks" and after two more cliks in the same direction it jumps back to ~33 (Wich one is the interrupt pins on uno >> you say 2-3 in the video, but in the code and schema is 2-4) Nice video and thank you 4 it! Any help would be appreciated!

[@Aridzonan13]

Have you done any exploration of PyFirmata / MQTT com protocols??

[@paulsharpe7740]

hi I've enjoyed and learnt a lot from your videos about arduino wich is helping me .you have mentioned that you would like some ideas I've perchsed a pear of apc220 radio transverse thay have a range of 3000 feet .but all the information I can find is very brief and not too much help. hopefully you can help . Paul

[@BrainybitsCanada]

+Paul Sharpe Hi Paul, unfortunately I don't have these module on hand to test. If I do in the future I'll get back to you and let you know what I found. Thanks for watching!

[@NunoRVOliveira]

When did indentation got so expensive?????

[@phon72able]

Whether and it is possible to construct operation of the step engine with interruption on trailer switches. The step motor with use of the driver.

[@BrainybitsCanada]

+Druid Can you explain what you are trying to achieve... Thanks for watching!

[@abulais5987]

Is it possible to use pin change inturrupt and sleep mode ? Normally controller will be in sleep mode whenever any changes appears on any pin wake-up and blink the led

[@adilmachrouki4173]

Hello Brainy-Bits i work for long time to understand pin change int but it doesn't work i want to have code wich use pin 7 (on arduino uno ) as pin change int to turn on and off led on pin 13

[@acirinelli]

This is super helpful! Do you think I can run 7 encoders on the UNO with this library?

[@harshitsomani1717]

Anthony Cirinelli there is compilation error even if i am including the library..can u tell be y it is so

[@VIPPersonTM]

Do you mind , produce a video interrupted with a limit switch example change! relay on change ! relay off while motor speed still the same but forward and reverse depending on change!

[@engineerelectrical7855]

Hi if the external voltage is a maximum of 0.4 volts then, Is there a way to generate interrupt in arduino if the pin voltage goes from 0-0.4 volts. Either by digital or analogue pin?

[@ImaginaryHuman072889]

are interrupts edge-triggered only? for example if the interrupt input stays in the high state for a long time, will the interrupt loop for that input execute continuously until the interrupt input goes to the low state? or does it only execute exactly once?

[@hansdegroot652]

Thx

[@premchandkarnati]

Hello sir, I am facing a problem with Interrupt program when I interfacing Bluetooth module...Without giving any interrupts my program is interrupted when Bluetooth module is connected. Will you please help me to solve this issue...

[@taranagnew436]

how do i write to the LCD screen on my LCD shield that when the select button is pushed, it reads that the button was pushed and displays it onto the screen, BTW i am trying to make a digital dice to play catan with

[@sebastianrodriguez2568]

Hi! I'm using this library in conjunction with modbusmaster.h for a project I'm building. Initially, I had the problem of the interrupt vectors: both libraries use the same interrupt vectors and the code wouldn't compile. I fixed that with the library altSoftSerial.h but now I can't send data via modbus. Did you ever experience this problem? Any guidance on how to fix it? Thanks in advance

[@pwandi3168]

thx :D

[@abulais5987]

I want to use 4 pins as inturrupts is it possible to do ?

Hi, I want data from the sensor once. But since the arduino is constantly powered and therefore operates, data is constantly coming from the sensor. How can I do this with an interrupt or anything? Thank you

[@SafakBulbul]

You should disable interrupts for the sensor that connected or you can add simple if statement that check a flag which says your interrupt service routine (ISR) to return immediately without doing nothing.

[@lsdave]

Hello Ivan. Have you done any videos of using interrupts to parse data coming in on the UART?

[@BrainybitsCanada]

+lsdave Hi, I didn't do a video on this yet. Can you give me an example you would like to see? Like reading from the Serial monitor and display on LCD? Thanks for watching and the suggestion!

[@lsdave]

For instance, some type of command structure or communication protocol being sent from the serial monitor, and using interrupts with the UART to parse the data. Maybe load the data into a structure and then parse it out from there.

[@BrainybitsCanada]

Ok got it! Will try to find a way where this could be used in one of our tutorials. Thanks for the suggestion!

[@LSUtiger607]

How would this code be different if you wanted to use it to read the PWM from multiple channels from a hobby receiver?

[@BrainybitsCanada]

+LSUtiger607 That's a good question :) I'll take a look to see how this could be used with an RC receiver! Will let you know what I find. Thanks for comment and watching!

[@harshitsomani1717]

There is compilation error even if am including that library..what might be the problem

[@MinhTruong1093]

I got the same problem :(

[@ThePfitzger]

Use proper block indents on your "C"-code. All left justified is problematic. Your second call to " if (!digitalRead( PinDT () )" should just be an else word.

[@nilsbruhner1983]

BLablabla, wesserbisser :)

[@spetsnatzlegion3366]

Or just use a teensy

[@eky]

3:25 in the case of 2 interrupts getting triggered at almost the same time: what if the second interrupt is triggered while the first one is still running its code? is it gonna misfire? or is it gonna wait?

[@BrainybitsCanada]

+razead Like I mentioned in the video, 2 interrupts will never be triggered at the same exact time, there will always be one that gets triggered first, even if it's by a millisecond. Since only one can run at a time, other interrupts will be executed after the current one finishes in the order they were triggered. So I guess short answer is 'It's gonna wait!' :) Hope this helped, thanks for watching!

[@grantcivyt]

+Brainy-Bits This isn't quite correct. Interrupts have a pre-defined priority that determines their sequencing. For example, a reset will interrupt all other interrupt routines. You can see Nick Gammon's reference material for details: gammon.com.au/interrupts

[@akshayshinde8573]

Can the interupt be used on analog pins?

[@paulmichaud3230]

Each Arduino board has interrupts on select pins. Arduino Uno uses only pins 2 and 3 for interrupts.

[@amtpdb1]

Thanks for the video. Could I suggest you don't present so matter of fact. Some of us (maybe just me) are learning and some of this is totally new. Possible suggest some of your other videos that parts of each of your videos were included here could be learned. Thanks again. What parts of the library code terms here can be changed and what portions of the terms cannot be changed? I just found your page and subscribed.

[@marcodev3375]

I want the vcc pin to be an interrupt 😆

[@tin2001]

Sure... Unplug it, and it interrupts everything.

[@kennethd.bryant9279]

I've got a problem, my UNO lost it's bootloader and I have not been able to find a solution. Bought the FTD but doesn't seem to work. Where can I go to LEARN how to do this?

[@imabeapirate]

Much appreciated! Would this change much for an analog pin (say one that is sampling a pot)?

[@BrainybitsCanada]

+imabeapirate That's a good question :) never used interrupts with analog devices (ie. pot) so couldn't tell you right away. When I have some time will check that out and let you know what I find out! Thanks for the comment and watching!

[@EngAhmedalsalhi]

nice

[@BrainybitsCanada]

+eashak ahmad Thanks for watching!

[@EngAhmedalsalhi]

Brainy-Bits​ ☺All thanks to me and I wish you success

[@chuck_norris]

cringe title

[@FrankTricamo]

nice video... You have a bad habit of using the word "basically" as a filler in your script. Like many people you're probably not even aware of it. thanks for the info...

[@BrainybitsCanada]

I've noticed that I do that, since none of my videos are scripted, my brain sometimes takes times to know what to say next, and the best it comes up with is words like "basically" while searching :) I'll try to keep that in mind when I make new videos. Thanks for watching btw.

[@samk2630]

Thank you!