This video was featured on Hackaday.com on 3/8/2011
This tutorial was featured on the official Arduino blog on 3/9/2011
Interrupts are an extremely useful, yet often feared element of microprocessors. Interrupts allow you to run a program, while still being able to react to asynchronous input from the outside world. On many platforms they can be confusing to implement, but the arduino makes it easy! In this week’s episode, I’ll show you how to use a hardware-debounced button to activate a hardware interrupt on the arduino. I’d suggest you go check out episode 2, where I initially introduced button debouncing, if you haven’t already. I won’t be covering timer interrupts in this episode, since I recently wrote an extensive blog post about using them. Enjoy the video!
EDIT: You can find a great run-down of debouncing techniques and problems here: http://www.ganssle.com/debouncing.htm (Thanks Jope)
You can download the files associated with this episode here:
Distributed under the GNU General Public (Open-Source) License.
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February 22, 2013 at 12:03 am
I would like a suggestion on execution of an interrupt only on the condition that the value change is retained for like 10 seconds. I would like to know if the hardware and software solutions/
February 25, 2013 at 2:39 am
Dear mr Blum,
Your Schmitt trigger debounce sketch is very helpfull for me.
My question is: can this sketch be changed in a single state switch. (When the switch is pressed, the pinled is on and when released it is off). And yes, how?
Greetings,
Erik
February 27, 2013 at 11:30 pm
You don’t need to debounce that. Just use an if statement in a loop
In psuedo-code:
if (switch is high) Turn LED on
else Turn LED off
March 14, 2013 at 8:49 pm
hi i am using intrupts with in intrupts while i am doing it i am experiencing different problems
1) the code suddenly stops to function
2) when ever interrupt is called with in an interrupt i cannot predict the behavior
April 4, 2013 at 5:37 pm
Hi Jeremy,
Great tutorials, great work.. no words.. learned a lot thankyou.
I am working on building a kind of pressure sensor to trigger a flow in java code.
I cant figure out what is the best way to recive that trigger, I want to send “true” as long as the pressure is above some value (like a button).
Thanks,
Guv
May 3, 2013 at 6:45 am
Dear Mr. Blum
Can i make pushbutton for clock input?for example 4026?
so everytime i press the button it will give the clock falling edge input,without arduino it works because it just a simple seven segment counter, but now the problem is i want to add arduino+xbee so i can wirelessly input the clock with button. I want to make a wireless scoreboard :)
Great tutorial anyway ,it really helps, thanks you :D
Regards,
Anasthasia
PS : sorry for my bad english, it’s not my native language
i’m a beginner :)
May 10, 2013 at 12:07 am
hey Jeremy.. I am new with the arduino board. Im am designing a parking lot with two floors. with four parking space each. the problem is i have created both floors separately. When I try to put it together my program doesn’t work. I have also used two interrupts for my arduino uno board so that the user can choose the floor they want to park but the spot will be chosen automatically. my problem is im not sure how to write the coding for two separate interrupts in my program. Can u help me?
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