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 TH-cam CHANNEL! bit.ly/3tku2n0
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
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.
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!
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.
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!
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.
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
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.
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.😀
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)); }
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.
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.
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.
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.
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!
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.
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.
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
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 👍
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!! :-)
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
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!
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.
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
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!
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?
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.
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
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?
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.
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]).
at 7:57 Just one question, where did you defined these 10 seconds or this is "hardcoded" in your sensor to keep 10 seconds HIGH after motion was detected? Thanks
In the PIR example, you can't attach two different interrupts to the same pin? For example, attachInterrupt(0, LEDon, RISING) and attachInterrup(0, LEDoff, FALLING). You need to use separate pins for the different conditions?
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?
I programed a stepper motor that stop 24 time in one loop. Would you know how to turn on an led for each stop ? So 24 blink. LED on while motors stops. LED off while motor rotates. Thanx for your great help
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.
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?
Thanks for the great video. I have a questions - why do you use 2 pins for the 2 interrupts. Is it not possible to use the same pin, one when it goes HIGH and the other when it goes LOW? Appreciate your help.
I was reading the comments looking for someone asking or stating that, as conditions are different (Raise and fall), one pin interrupt can be used. I don't have any spare arduino now to verify this, so if any can do it, you are welcome to comment if it works or not.
Just gotta say, if it wasn't for your videos I wouldn't have been able to build my home automation motorized blinds for my home. Now, I'm wondering if I should have used interrupts with my project. Is it possible to use interrupts with nrf24 wireless modules? How would that look?
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 TH-cam CHANNEL!
bit.ly/3tku2n0
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
Can i adjust the 10 secondd to .5 millis? Using the potentiometer of PIR
....so you check your mailbox every ten minutes. Best example of how interrupts work that I have heard. Thank you.
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.
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!
"without any further delay let's get started!"
I see what you did there... I see it!
kudos to you Mr. educ8s!
:-) :-D You are a clown :-D :-D :-D :-D :-D
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.
Good one
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!
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.
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
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.
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
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.😀
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));
}
Simple, clear explanation of how to use interrupts with an Arduino. Perfect for dummies like me.
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.
Thank you very much, my friend, for your kind words. I am glad it was helpful.
Well explained. I've not really understood the basics of interrupts till now.
Excellent explanation, thnx!
I'm wrestling this interrupt stuff for two weeks now, so I hope your basic setup will do the trick finally!
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.
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
Thanks!
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.
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.
Well, as many others, I have to say that I really appreciate the way you explain those videos. Very good, thank you.
Συγχαρητήρια. Πολύ καλή και τεκμηριωμένη δουλειά!!
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.
I am working on a digital speedometer for my motorbike and would use this to issue interrupt whenever Reed switch senses a revolution completion.
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!
Thank you my new friend ! I like your idea of sharing and helping people learn Electronics etc .
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.
I'm Italian, I love your English! clear and usefull. Thanks
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.
Thank you for your video! TH-cam is for people like you.
Thanks for the video, saved me a lot of time trying to figure this out for myself.
Excellent dear friend. Great projects discussed. This was what exactly I was looking for my projects. Keep the excellent work up.
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
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 👍
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!! :-)
Thanks for explaining interrupts.
I will use with photo interrupter for tachometer.
Outstanding. A concept I thought was very difficult, has been very clearly explained. Chetan Pandit
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
Fantastic easy to follow interrupt demo. Thank You
Excellent tutorial, which is very well explained. Thank you for sharing your knowledge.
I can see that interrupts are highly useful - and the doorway to programming much more complicated applications !!
Thank you Nick ! Best regards from Turkey.
Hi, I started learning the arduino, and this video very usefull for me. Short, simple. Thanks.
Hi nick!! Really thanks for all the wonderful and easy tutorial you make!!
Thank you for the nice words! Cheers!
Exactly what I was looking for ! A big thank you . Bravo.
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!
Όντως φίλε αυτό το βίντεο μου πήρε μια βδομάδα να το φτιάξω, αλλά πιστεύω το αποτέλεσμα άξιζε τον κόπο!
thanks for all the clear and nice tutorials
I LOVE THAT QUOTE AT THE BEGINNING OF THE VIDEO!!!
FANTASTIC. Wanting to click the Thumbs Up multiple times...
Where have you been all this time Master! Thank you for this.
a VERY well organized tutorial. i absolutely love all the links! thx for all of the effort!! - a new fan
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.
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.
I have had button bouncing issues. Thanks for this great video.
Another AWESOME video. I'm learning a lot here. thank you for your channel! Keep up with the great work.
Can you make further solid examples with different tools like lcd light control with movement?
Thank's a lot for this educational video. I am currently working on a project where this fits perfectly!
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?
i needed this for my project, thanks
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
woah, I encounter interrupts in arduino from this video, great job, man !
great video sir! thanks! finally understood interrupts!!
Very good tutorial! Thank you! I will have to try this on my battery powered projects!
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!
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?
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.
Glad it helped!
Why is it just now I lean about interrupts?! That'll save me a lot of headaches in the future, thanks!
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
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?
Excellent tutorial! Thanks
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.
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 :)
Yea, I never knew this was possible. I'll defnitely use it for my projects if I can. Thanks for the excellent tips! :-)
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]).
at 7:57 Just one question, where did you defined these 10 seconds or this is "hardcoded" in your sensor to keep 10 seconds HIGH after motion was detected?
Thanks
The sensor goes low after 10 seconds if no movement is detected. It is a function of the sensor.
Very well explained thank you,
Can you change the time so the length in which the LED lights?
In the PIR example, you can't attach two different interrupts to the same pin? For example, attachInterrupt(0, LEDon, RISING) and attachInterrup(0, LEDoff, FALLING). You need to use separate pins for the different conditions?
No, each digital pin must have only one ISR. But with the trigger mode CHANGE you can create the same behavior in a single ISR.
Great, thank you.
How much amazing information! Great stuff.
Thank you very much, that was so helpful!
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?
Hello can you make a video on how to go from the breadboard to a prototype on pcbs?
I programed a stepper motor that stop 24 time in one loop.
Would you know how to turn on an led for each stop ? So 24 blink.
LED on while motors stops. LED off while motor rotates. Thanx for your great help
thanks for your time to share your knowledge with all of us 👍😀
no delay on section ISR only or all of code sir ? can i take some delays in void loop
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.
very nice and to the point.Thanks for sharing.
Best Interrpt video on TH-cam
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?
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 ?
At around 4:20, in the if condition, I don't get why there is only "if(ledOn)"
Shouldn't it be something like "if(ledOn == true) {...}?
+Mr.Carlozan it is exactly the same
it validates the statement inside braces to be TRUE. "ledOn==TRUE" is TRUE . So, "if(ledOn)" is same as writing "(ledOn==TRUE)"
I love it and very good tutorial. Will use interrupts on my ESP8266 projects!
Excellent Video! Just subscribed to your channel.
wow...you improved much on your tutorial, very well done :) thanks for that nick :)))
Thanks for the great video.
I have a questions - why do you use 2 pins for the 2 interrupts. Is it not possible to use the same pin, one when it goes HIGH and the other when it goes LOW?
Appreciate your help.
I was reading the comments looking for someone asking or stating that, as conditions are different (Raise and fall), one pin interrupt can be used. I don't have any spare arduino now to verify this, so if any can do it, you are welcome to comment if it works or not.
Nice explanation....thnkyou very much upload more videos.......
Thank you so much! The video was clear and well descriptive. New Subscriber :)
Congretulations for your video, very interesting
Thanks a lot
it is so useful informations and easy to understand
Just gotta say, if it wasn't for your videos I wouldn't have been able to build my home automation motorized blinds for my home. Now, I'm wondering if I should have used interrupts with my project. Is it possible to use interrupts with nrf24 wireless modules? How would that look?
Aren't the NRF24 modules attached to Arduino boards?
Its a good video ... You did a really good job
Thank you, my friend!