It only takes a minute to sign up. I am experiencing some very strange behavior with my arduino. I have a switch-case statement in the loop method, and the break methods are not only breaking out of the case block, but also out of the loop statement.
Is this normal, and if so, how can I edit the structure so it doesn't do that? My code structure looks like this:. Examine the output on the serial monitor of your computer. You should find that the "After switch statement" line always appears after the "before switch Break breaks from the innermost scope. If you have nested levels of scope, like a function and then a switch statement inside the function, the break statement breaks out of that inner level.
In the second example, the break broke out of the switch but the for loop kept running. I just realized it wasn't the sketch, but a faulty SD card reader on my computer corrupted my SD card.
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Break statement terminating loop [closed] Ask Question.
Asked 5 years, 7 months ago. Active 5 years, 7 months ago. Viewed 10k times. Jaca Jaca 7 1 1 gold badge 1 1 silver badge 4 4 bronze badges. I'm closing this because the source of the problem turned out to be unrelated to the original question.
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Your sample is too simple to test your hypothesis which is wrong, by the way. This is very basic C programming and not specific to Arduino. Duncan C Duncan C 3, 2 2 gold badges 8 8 silver badges 22 22 bronze badges.
The thing is, I'm running the MCU of my arduino in a completely different board, so I can't use the serial monitor.
Hook up an LCD display then? Or better yet, get a C compiler for your computer and learn the basics of C that way. As I say, your questions are on vanilla C, and not at all specific to the Arduino.
You're going to spin yourself in circles trying to develop when you don't know the language and can't even add debugging statements.During development of your sketch, you may find your source becoming quite lengthy and appearing cluttered; which can make it harder to maintain and possibly debug. This article is focused on separating a large code base into multiple files or commonly termed as modules or translation units.
Splitting up your code provides an organisational benefit as you can group common features together and separate unique elements. To illustrate the method, a simple single file sketch can be seen below. It contains a function and a simple class. I want to separate the sketch from the helper function and give the class its own module. The first modification to the sketch is to add some new files.
Before doing this, it is important you save your sketch. Without saving, the IDE will auto save a new sketch into the temporary files directory. This is very unsafe as the temporary folder could be emptied at any time, taking your sketch with it. Each module requires both a. Once the files have been added, the IDE needs to be informed of the changes.
You can do this by simply reopening your sketch. When complete, the IDE will display additional tabs for each of the new files. Unlike the sketch file.
This could be at the top of your sketch file, or like this example, inside another header file. If a separate header is used, the file that uses the function must include the header. The ifdef tags are used to prevent a multiple definition error incase the header is included in more than one locaiton.
The define macro identifier can be any valid unique name. To add multiple functions you simply repeat the process of adding the definition in the.
The process of moving a class into its own header is virtually the same as the function based method described above. Now the sketch only has to include the files containing its required functionality. The sketch is smaller and each unique segment is located in its own file making large programs easy to navigate.
Of course, smart file naming is valuable, a folder full of obscure file names is not much easier than searching a single massive sketch file. The initial and completed projects are attached if you would like to have a first hand look at the differences. You can comment this FAQ. Added at: Just from their similar names? Comment of Joel K : Thanks for a great example of 1 how to move functions to separate files and Comment of Luca : This worked perfectly with the class, but when I follow the same steps for the separate Am I missing something really obvious?
Arduino specifically provides absolutely no way to exit their loop function, as exhibited by the code that actually runs it:. The closest you can do is to just halt the processor. That will stop processing until it's reset. This isn't published on Arduino. This will compile on pretty much any board you have in your board list.
I'm using IDE 1. I use this in projects where I wire in a button to the reset pin. Basically your loop runs until exit 0 ; and then just persists in the last state. I've made some robots for my kids, and each time the press a button reset the code starts from the start of the loop function.
Matti Virkkunen said it right, there's no "decent" way of stopping the loop. Nonetheless, by looking at your code and making several assumptions, I imagine you're trying to output a signal with a given frequency, but you want to be able to stop it. You can read the Arduino reference for more information about this topic, but in a nutshell this configuration sets an internal pullup resistor, this way you can just have your button connected to ground, with no need of external resistors.
The other option would be using one of the built-ins hardware timers to get a function called periodically with interruptions. I won't go in depth be here 's a great description of what it is and how to use it. This option runs your code once and then kicks the Ard into an endless "invisible" loop. Perhaps not the nicest way to go, but as far as outside appearances, it gets the job done.
The Ard will continue to draw current while it spins itself in an endless circle This often requires declaring a global variable and having the "stop main loop" function toggle the value of the variable upon termination.
Granted, this might not be especially pretty, but it also works. There are certainly other ways to "stop" that pesky endless main loop but these three as well as those already mentioned should get you started. Learn more. Asked 6 years ago. Active 1 year, 11 months ago. Viewed k times. I have this loop, how would I end the loop? Beep Beep 2, 5 5 gold badges 23 23 silver badges 63 63 bronze badges. Active Oldest Votes. Matti Virkkunen Matti Virkkunen How does one halt the processor? Brent: By disabling interrupts and putting the processor into a sleep state.
You can wrap that in an infinite loop to be extra sure execution never continues. MohamedElShenawy: That would only return from the call to your "loop" function and go back to the for loop in main.
Zoul Zoul 4 4 silver badges 6 6 bronze badges. I've used this too.Use a sledgehammer, fire a bullet at it, throw it into a pool You know what we mean Why are we doing this? Short the pin to ground. The microcontroller datasheet specifies an absolute maximum per-pin current of 40mA.
With a typical internal resistance of only 25 ohms per pin, a dead short to ground can allow as much as mA of current to flow, more than enough to destroy the microcontroller pin. Now connect the pins together. The path of current flow is similar to Method 1 above except the ground return path is through the microcontroller.
This method of destruction forward-biases the ESD protection diode built-in to the microcontroller. This is OK for diverting a short-duration overvoltage event, like ESD electro-static dischargebut that diode is not meant to be on all the time. It will simply burn out and stop protecting the pin. This means it will reach other components, like the USB interface chip, and destroy them too. The PTC fuse limits this current to 30mA so the 5. You will destroy several devices on the Arduino.
There is no reverse-voltage protection on voltages applied to the Vin connector pin. The same thing will happen with the ATmega16U2 microcontroller. Both microcontrollers and the 5V regulator will be destroyed. You can apply as much as 30V of reverse-polarity voltage on the Vin pin without causing any damage. Apply a voltage of 6V or higher to the 5V connector pin.
Arduino - for loop
There is no protection on the 5V connector pin.Pages: . I have 2 buttons and 2 leds. If I push button 1, led1 light for 10 seconds. So far it works. If led 1 is on, I want it turn it off, the moment I press button 2, even it is still in the 'delay' time.
I have no idea how to solve this. Anyone a clue? Code: [Select]. You can use an external interrupt which is triggered by a button to escape out of all those delays you've built into your code.
The recommended approach is, however, not to use the delay function at all and instead set timers using the millis function and test these perioically in your loop. See the standard sketch "blink without delay" for an example of this. Quote from: richard on Mar 29,am.
This sounds like a scenario where interrupts should be used. Trying to get back into electronics after 15 years absence. Quote from: trevortjes on Mar 29,am.
If you understand an example, use it. If you don't understand an example, don't use it. Electronics engineer by trade, software engineer by profession. Quote from: jurs on Mar 29,am.
If you think a FSM is to complicated then I would stop programming The name and all the in depth theory might seem daunting but it really isn't that hard.Break- Continue - Goto / Estruturas de Controle Arduino
Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. It only takes a minute to sign up. I am sending a list of servo positions via the serial connection to the arduino in the following format. Contrarily to other answers, I'd rather stay away from String for the following reasons:.
The advantage here is that no dynamic memory allocation takes place; you can even declare input as a local variable inside a function that would read the commands and execute them; once the function is returned the size occupied by input in the stack is recovered. This function can be used to separate a string into pieces based on what the separating character is. This Chunk of code takes a string and separates it based on a given character and returns The item between the separating character.
If you use readStringUntilit will wait until it receives the character or timeouts. Thus, with your current string, the last position will last a little longer, as it has to wait. If you use the servo index, maybe you want to check it convert to intand then match the loop index i to ensure that nothing went wrong with your message. You have to check that the returning string from readStringUntil is not empty. If the function timeouts, you didn't receive enough data, and thus any attempt to extract your int values will produce strange results.
You can use Stream. On each part you then call String. Simplest solution is to use sscanf. However Attiny85 doesn't have bidirectional serial - SoftwareSerial has to be used. This is how you port same code for Attiny Attiny85 schematics for pin numbers.
It's not an answer to your question but it may be useful for someone. If your string has a specific prefix, then you can use simply startsWith and substring. Here is Arduino method to split a String as answer to the question "How to split a string in substring? Instead of having a String received from Serialthe String is read from file.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How do I split an incoming string? Ask Question. Asked 6 years ago. Active 1 month ago.
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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. You will never leave this loop in order to be able to run a case such as Case 'D'.
You will need to put an if statement within the while loop that checks for whatever you want to be true. If it is true then you should break. Well, actually you can't break that while from outside since the program will only be running those instructions inside the while loop.
Maybe you should use another strategie. One would be the use of another variable that saves the option. Something like:. Looks like your "switch" case is a little malformed, I thought they always had to have a default case. The only issue with that is that while delaying between blinks its not testing for key presses, so to turn off the flag you'd have to hold 'D' for over two seconds, maybe even tap it.
Its been a while since I used one of those keypads. Learn more. How to break infinite while in Arduino Ask Question. Asked 4 years, 5 months ago. Active 22 days ago. Viewed 6k times. Brian 9, 7 7 gold badges 31 31 silver badges 43 43 bronze badges. Anas Anas 65 2 2 silver badges 8 8 bronze badges.
You won't be able to make such a thing. Using an infinite loop in this way shouldn't be a good idea. Try another way to control, for example, measureing time with millis. Active Oldest Votes. You can't exit the while loop therefore you will keep running the code digitalWrite 13,HIGH ; delay ; digitalWrite 13,LOW ; delay ; You will never leave this loop in order to be able to run a case such as Case 'D'.
If it is true then you should break; if statement break. Enayet Hussain Enayet Hussain 1 1 gold badge 8 8 silver badges 26 26 bronze badges. Or10n Or10n 4 4 silver badges 15 15 bronze badges.