Arduino void function with parameters

Arduino void function with parameters. The function name consists of a name specified to the function. Jan 20, 2008 · the build process puts function declarations (aka prototypes) at the top of the sketch. by value; for reference; Passing by value. It is used to call function. , Substring, IndexOf, etc. h ,Its successful! Thank you very much! gfvalvo: Additionally, if called without a target object, that class will throw a 'bad_function_call' exception. It produces the desired result. Mar 8, 2022 · Is there a way to create a function in an arduino code with int or void or a boolean array that will output multiple values? Is there a usful example you have. Some text messages are just strings so no need for the index argument. Or one pointer to a struct containing the parameters and the function - wait, that's an object! May 17, 2016 · zl1hb May 17, 2016, 10:12am 1. Jan 7, 2022 · Using Arduino Programming Questions. Use: forward (); The other 3 functions are not being ‘called’ in loop (). 6. Jun 24, 2014 · This is the sendSMS() function (without parameters): void sendSMS() { sms. Mar 7, 2011 · q. We will assign the value 5. } void loop() {. Learn void example code, reference, definition. Examples: Function taking no arguments and returning nothing: void foo (void) Mar 1, 2017 · By definition, there are two types of functions. h files of libraries, which can serve as a quick reference to the API of the library, so I prefer to leave the variable names in the function definitions because a well chosen variable name conveys information about the purpose of the parameter, and also makes it easy to reference that Sep 12, 2009 · Lets say that we have a struct and we want to create a function that increases the index by one. string MyFunction (string Mystring) {. bare); float layers = layersFromLength(wireFeet, w. The function needed to be declared before the call to it. You can pass a pointer to a function to another function. Two types of parameters can be passed to an Arduino function. co. Its just a Interrupt Timer like in Arduino with passing a callback function. void commonISR(uint8_t interruptNumber); volatile bool int0Fired = false; volatile bool int1Fired = false; void setup() {. How is that handled since (I believe) the Arduino environment does not implement exceptions? Feb 2, 2024 · In Arduino, we can declare functions and call them in the main code to work with subroutines. // Call myVoid and pass myFunction as a parameter. Dec 1, 2016 · First of all, notice this is C++, not C. Jan 28, 2018 · To accomplish this I wrote a function with 2 arguments; the first specifies which text message, the 2nd (which I want to be optional) specifies the index for names stored in an array. Aug 25, 2015 · AWOL: Two pointers - one to a function, the other to a structure containing the parameters. It might or might not change some GLOBAL variables but it isn't returning anything. print(" "); Feb 6, 2015 · sketch_feb06a:4: error: too few arguments to function 'void test4Fun (int, int)'. You're calling all other built in functions right but not these. ) that are easy to use, but horribly wasteful of memory. endSMS(); lcd. switch) bool state; //state of the switch. This worked for me. void printMessage(int a, int b); 4 days ago · The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. Reference. jamesale22 November 21, 2020, 1:47am 3. Nov 18, 2023 · In Arduino, you can use a function as a parameter for a void by defining the function outside of the void and passing it as an argument when calling the void. e. Jan 15, 2024 · void onReceive (void (* function) (int)) Sets a function to be called when data is received by the slave. Inside the called function, the sizeof operator tells something about the argument, so it tells you the size of the pointer, not the size of Dec 19, 2016 · Incidentally, sizeof () would not have worked anyway because it returns the number of bytes used by the array, not the size of the array. such as other parameters. Because of this, most Arduino programmers prefer to use C strings built from char arrays. Jan 28, 2023 · A want to call a function with an undefined number of arguments, all of the same struct type. #include <stdio. Part 2 All C/C++ functions must be prototyped (declared) before they can be used. do something. The parser that scans the sketch does not understand c++ so can't make sense of the default arguments. se Mar 5, 2022 · For a simple one-line function, it's easier to see what's going on if it's defined inline with the code it's related to. The diagram below shows the pitch function from the next sketch. cpp (i Nov 21, 2020 · LarryD November 21, 2020, 1:29am 2. Fredx February 22, 2017, 8:26am 6. 9. ino:64:20: error: ‘writeHighscore’ was not declared in this scope. return; // the rest of a dysfunctional sketch here. It represents the real body of the function. Some options: Return a struct. the question is: how do I retrieve b? Return a struct with both values in it, or have your function take pointers to a and b and write the values there. print(x); Serial. int Add(int num, ) int valu; Feb 28, 2021 · As we have already anticipated, a function can receive some values as input, through the arguments of the function itself. function(10); // Initialize Arduino. Okay, I did not know that, thank you! StefanL38 November 21, 2020, 7:12am 4. it can be nothing, one or more parameters. So I'm correct in thinking you can't receive multiple variables back from the function, so the only way is to make a struct so the "one variable" contains all the Dec 4, 2012 · Strings are evil. Hello, I'm wondering if there is any sense using significantly different constant parameters when calling a function with slightly altered purpose? For example: const uint8_t PARAM_1 = 0; const uint8_t PARAM_2 = 1; void doSomething(const uint8_t param) {. The code is executed line by line, and if we call a function at a line, Arduino will stop at that line and move to that function’s declaration. 8. nothing returned). For example, I would make the following definition: int one[5]={2,3,4,5,6}; // 5-number array to pass along Then inside my loop I would pass this to the function 'myLED()' which I hdefine later: void loop() { myLED(one); // pass along the 5 numbers to the function Jan 27, 2015 · Just to get the terminology right, it is a function initializer. Solution: Move the definition of Struc into another header file and include this. To send it by reference, you should: void swap_reference(struct rect &input) {. this will not compile: <setup()> is here. You must define the function that takes the pointer to function as an argument to take the right kind of function, then you must pass the right kind of arguments to the function. c = 'z'; return q; } Piplodocus March 7, 2011, 6:17pm 4. void fcn1(int *variable) {. 1 Like. Also, their dynamic nature often can lead to memory fragmentation. it, Amazon. just a heads-up on passing classes as function parameter: You can't pass a class as a function parameter. Delta_G August 21, 2013, 3:34pm 3. Example code: /*** This code could be hidden within a class or library somewhere ***/ typedef void (*voidFuncPtr)(void);// Create a type to point to a funciton. sketch_feb06a:6: error: at this point in file. cpp and . SendMsg("Hello World"); SendMsg function. the output is quite strange: 000 . I am trying to find a simple way to use pointer functions to build a FSM. Just use floor(num) to get a (if you need it outside the function), and return b May 23, 2023 · Hello, I'm currently having some issues creating some callback functions in cpp to use within the ino file. Here's an example: // Do something with the value. void (*state_table []) = {state_a, state_b}; // this line gives Apr 24, 2022 · I made a function to shorten code because i will control two heaters with pid, the library needs pid parameters and instead of defining all of them in a function i thought i could use a struct, so i made a struct containing those parameters and everything looked fine but when i tried to call the function with those parameters in main. I have and array of void pointers that i want to pass the a function inside a class. I have it working using void functions with no parameters, but as soon as I try to add params as part of the callback, it starts throwing invalid use of Void Expression errors. any help or guidance would be Jan 25, 2021 · Hello, I want to use the TeensyTimerTool. myVoid(myFunction); Apr 13, 2016 · This is a very common way of defining callbacks in C: a callback contains both a function and a void * pointer to arbitrary data, which will be given as a parameter to the function. 8, IDE 1. That's allowed (Thank goodness!) I need a void function with no arguments to pass to the SimpleTimer library. It is up to the user to decide if and how he will use this pointer: he could completely ignore it, like he could make it point to the root of a complex data tree. Mar 26, 2019 · That is probably the easiest way. void fcn1(int &variable) {. cpp:147:42: error: invalid use of non-static Nov 25, 2008 · That didn't do what you wanted, so I suggested modifying the function slightly, adding the "&" to make the function's parameter call-by-reference instead of call-by-value. void print_array(int (&array)[3]) {. Procyan: The reference page says: Mar 19, 2022 · i have this sketch that uses lots of different led effects when a button is pushed. println(R1000ft(w. For example, the function header for function modifyArray might Function Call with Parameters. Optional arguments are defined in the header file or function prototype, not in the function definition. I found several links where I started building my code from, but none of them led me yet to a complete working function: use a variadic func with struct arguments: how to pass and access a struct to a variadic function in C - Stack Overflow if we want to have different types of args, read this: va_arg Jan 15, 2019 · void Setup(std::function<void()> pinSetFunc); I changed function to function<void()> in . // Do something to variable. Main sketch: Struc s; func(&s); Mar 12, 2018 · My understanding of the two Functions method: Step 1: Use static callback method with no parameters in Task definition (done) _ Task * timer = new Task (dur, it, &turnTimedOff, device->scheduler, false);_. Dec 2, 2019 · SayHello(); // use function }} void SayHello() { // actual function code Serial. Call-by-reference parameters are not copies; instead they refer directly to the original value. Parameters. 'void' simply indicates that the function does not return a value. Another great benefit of lambda functions is that they can capture variables from the surrounding scope. How to pass string to function in Arduino? ArduinoGetStarted. "void" is the return value (ie. Jul 21, 2020 · As a simple example, let's say you wanted to write a function to print out the values of an array. The Arduino IDE first scans your sketch for any functions, and creates prototypes for them at the top of the compilation . The function may or may not return a value. string YourString = MyFunction ("Goodby"); Apr 16, 2021 · How to return the value from a void function and use it inside in another function or in the void loop? Goal: I want the variable get the data to from another function (byte selector) to another function (byte signalpwm_1). As an example for the ones who had the same need, you can do like below and all 5 alarms below will work fine. This is my code: byte SW1_GPIO = 22; //digital input (i. Don't use them. fr, Amazon. The result will be at serial which either (1 or 2 or 3) so than I can switch-case afterwards. Mar 24, 2013 · system March 24, 2013, 10:47am 2. For example, the function header for function modifyArray might To pass an element of an array to a function, use the subscripted name of the array element as an argument in the function call. It usually depends on the compiler how forgiving it is but it can throw a warning (not tested) if you e. Kevin77 February 6, 2015, 5:53pm 3. com, Amazon. setCursor(0, 0); lcd. } Once those variables are declared, you can use them inside the function! void myFunction(int x, int y) {. In loop () you have void forward (); this is just a functional prototype. int value; // use meaningful names in your code. Mar 19, 2018 · void Function1(); When you put void in front of Function1, it makes this a declaration statement, not an executable one. ive tried using the millis and a universal timer library but everywhere i put it has no effect, the leds just continue what they were doing. Not sure what is up at this point, but I'm sure I'm probably screwing up the function pointer syntax. string a = "Hello"; return a; } because the string is returned from a function to use it elsewhere you can call it like. The first thing we are going to do is declaring a global variable, of type int, and assign it a value. Declaring your function above "loop ()" will avoid the need of a prototype. This allows you to be lazy and define your functions in any order, even calling them higher up in your sketch that they are defined. If it does not return a value it is declared void. int globalIntVar = 5; Then, on the setup function, we will start a serial connection. Sep 13, 2021 · When compiling a void containing a float with arguments in it, like the example seen in the previous message, you receive this error: Serial. system February 6, 2015, 5:40pm 2. May 31, 2017 · you may be looking for something like this: by nickgammon Function pointers / function callbacks / function variables. To declare, or write, a function that is able to do this, you would need to include variables that are only used within the function: void myFunction(int x, int y) {. For a function to receive an array through a function call, the function’s parameter list must specify that the function expects to receive an array. valu: 4 total: 9. In our Arduino code, we have often seen the following structure: void setup() {. " It's frequently used for "callbacks" from service routines, in the sense that if you have a low-level timer alarm function, you can register a function for the low level call, without the low-level call needing to know the details of how the higher level code works. this. Functions in Arduino. print("Message sent!"); delay(10000); } Jan 12, 2022 · bool ReadCT(void *) "void *" means "a pointer to "something not tightly specified. pl and Amazon. Each parameter includes the data type of parameter and parameter name. amazed January 7, 2022, 11:34am 1. Pointer. They are, a system-defined function and a user-defined function. Sep 10, 2020 · A 3 part answer: a) if you would handle the numbers also as char, than you don't need 4 functions. valu: 3 total: 5. Then, you can use that pointer to call the function. I'm wondering if one is preferred over the other. Method 1. int Back(int TD); // these are the problems, have I formatted them right. nl, Amazon. But, if you want to get down into the weeds, you can redefine the interrupt vectors to call a common ISR with a parameter: #include "Arduino. The problem is, that the Arduino-IDE auto-translates this into C like this: Struc s; func(&s); Which means Struc is used in the declaration of func before Struc is known to the C compiler. – Apr 6, 2022 · Here I want to create two functions where: function 1 (called "task1") monitors the state of a switch and stores it in a variable called "state". Steve. singleInsulated); float maxLayers = (calcMaxLayers(w Sep 10, 2013 · Btw. Ultimately, paypal attention to delay(). In today's lesson we learn how to pass variables and paramet Dec 26, 2018 · That's calling a function, not declaring a function. Remember that a function can have one or more parameters—data that the function receives and uses when it is called. try to return an integer from a function that is declared as void. Jul 20, 2019 · you could do that, but a struct may have other data as well - such as multiple arrays for multiple dimensions of parameters. You need to pass the size of the array to the function as well as the actual array. Recall from Chapter 1, Activity #3 that the Arduino stores variable values in different WE have learned in earlier lessons that is it poor programming practice to use global variables. Inbound the void loop (and any function called upon that void loop) you don’t to to block the execution of the code too long, specialized if you flat to do some kind of multi-threading with your Arduino. You pass parameters (arguments). In C++ you can pass the parameter by: Value. 0 License. From a bird’s eye view, A function is a self-contained unit of program code designed to accomplish a particular task. singleInsulated)); float wireFeet = feetLengthFromResistance(Ohms, w. // this code will never be executed. Going back to the basic Blink example, the code that controls the behavior of the LED and actually results in the blinking effect is contained Dec 28, 2021 · To call the function: int getValueBack = myFunction ( passSomeValue , 674); write function: myFunction (int getOne, getTwo) { code using getOne & getTwo AND return sendSomeValue } Some more thoughts on using arduino functions and passing arguments or variables. See code example below (which does not worK) #include "Ticker. The parameters are data to pass to function when it Jan 18, 2017 · In order to make a variable from another function available inside the void loop() function you may do the following: I am using the data type byte to make tweet as a byte variable. You can pass an instance of a class. As you've suggested before, it is possible to create multiple Alarms that are branching to same function by using TimeAlarms library. Jul 19, 2019 · Forget about the "when it has conditional statements, processes", it's only connected to the return value of the function. I tried declaring the 2nd argument as a 'default' but then the compiler doesn't like the Jun 7, 2009 · I found another example of code that seems more logical - the first argument indicates the number of subsequent arguments. WillemBataillie May 6, 2017, 11:02am 1. May 7, 2017 · The setup code. Inside the printUserData function tweet will return the value also to the void loop function(), since its stored inside byte tweet. robtillaart: You can also define a struct containing all the variables that you need and let the function return that. Normally, the IDE handles that for you, but, of course, it doesn't understand default values for arguments. Think of functions as building material for Arduino programs. g. Aug 27, 2019 · Put simply if the function returns a value you can use it as "X = func (para);" and X will be set to the returned value. So, if you want the function to have default arguments, you either provide the function prototype or you define the function before you Void (NonValue-Returning) functions: Void functions are created and used just like value-returning functions except they do not return a value after the function executes. // Call the function. Aug 26, 2012 · Scott216 August 26, 2012, 5:46pm 1. Here is an example based on 'blink'. valu: 2 total: 2. When passing parameters by value to a function, a copy of the value itself is created within the local scope. at least, thats what i suspect is happening. Return an std::pair or std::tuple. public: Nov 11, 2017 · in Real 'C' you can return and pass a string like this. void - Arduino Reference This page is also available in 2 other languages Aug 22, 2019 · Most often, I am writing my own function prototypes in the . You can try to find your sketch in the temporary folder created by the Arduino IDE to see the full content. Now you should need a better idea is the concept behind Arduino void setup and loop Feb 3, 2011 · system February 3, 2011, 1:53pm 2. The return type of these functions is void. Serial. void: void onRequest (void (* function) (void)) Sets a function to be called when the master requests data from the slave. es, Amazon. To do it by reference, use an ampersand ( &, not to be confused with the address-of operator). com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. In the final implementation the class will part of a library, but i hope if i can get it working in this simple form - the solution will Jun 30, 2016 · I would like to define an array so that I could pass that array (of 5 numbers in this instance) to a function that I have defined. Since this is a global variable, its scope extends to the whole program execution. Mar 17, 2016 · Regarding 'void'. The parameters are optional. void: void clearWireTimeoutFlag Jul 5, 2013 · 9. Feb 4, 2016 · long a,b; a = floor(num); b = num * pow(10,6) - a * pow(10,6); return a; return b; When I call the function. index = 1; Now lets say that we want to make a general function that increases ints by one, in order to use it with the struct index or other ints. These parts are functions. can I use IF-ELSE in VOID SETUP () To answer your specific question, yes, you can use if/else in the setup () function. If you have access to std::function then you can just use that: void run(std::function<void()> fn) {. " A sort of hole in C's "strong typing. Thanks man, that really helped me out alot! Indeed exactly how you do the call from loop () (also a "void function") you can call functions from other functions. The attachInterrupt() function expects as the second argument a pointer to a function that takes no arguments. In C and C++, when you use the array name as an argument to a function, you are actually passing a pointer whose value is the address of the first element in the array. This is very useful if you need to pass data to a callback, for example. Whandall December 19, 2016, 2:01pm 3. h>. print(finalstr); sms. You can certainly call functions from inside another function if that's what you're asking. You call a function. After changing parameter type to String, int or whatever, all the errors go away. Tested with IDE 1. Just as your house is made of wood, drywall, and other materials Arduino programs are composed of different parts. } setup () and loop () are also functions. beginSMS(remoteNumber); sms. function 2 (called "task2") reads "state" from function 1 and displays it only if "state" is 0. Another important concept is that function call parameters are 'by value'. ca, Amazon. // brilliant code idea to test here. The use Jun 20, 2017 · 1. Feb 22, 2017 · UKHeliBob February 22, 2017, 8:21am 5. It is declared with void pitch (int Hz). The following code demonstrates how you would write that function, and how you can pass the array to the function: // Function that prints the elements of an array. To then use the array of pointers inside the class. The content is modified based on Official Arduino References by: adding more example codes and output, adding more notes and warning, rewriting some parts, and re-formating Apr 6, 2016 · String myName; char yourName[15]; As you might guess, Strings come with a lot of methods just like C# (e. I'm passing a character array to a function, and I can get it to work two different ways. I'm getting this error: no suitable constructor exists to convert from "void ()" to "std::function<void ()>" src/Stepper. What is Arduino void. ArduinoFAQ. b) if these char array represents the segments to switch on / of : char H [] = {"11001011"}; you don't need an array of 8 bytes at all. println(“Hello”);} This would be the proper way – this way we tell the compiler up front that when it sees the function “SayHello” that this function does not have a return value (void) and does not take any parameters. Hi. If not, it is declared "void". char msg[] = "Hello World"; SendMsg(msg); Method 2. Jul 31, 2018 · The Arduino IDE automatically declares these prototypes along with adding some includes to your sketch before it is actually compiled. you can put your LEDs in ONE byte (instead of 8) if you handle each bit: The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3. Aug 29, 2019 · Guys, problem solved. Apr 16, 2021 · Using Arduino Programming Questions. public: virtual void func() = 0; }; class Button {. Example: // 1. If it's a void function which doesn't return anything you call it using just "func1 (para1);". The void keyword is used only in function declarations. 1. uk, Amazon. id like the leds to turn off after say 10 mins regardless of what state it was in then if the button is pushed again go to the next effect. Whenever possible, use character arrays (char *). ino: In function ‘void setup()’: sketch. The function type merely describes what the function returns (the value that the function call evaluates to). Problem: the outcome is shown as available. h". struct MyStruct { int index; } myStruct; The struct is initialized with myStruct. // Use fn() to call the proxied function: fn(); } You can invoke this function with a lambda: run([]() { f(1, 2); }); Lambdas can even capture values from their enclosing scope: int a = 1; How to use void with Arduino. Conclusion. Hi, Paul, Aug 9, 2022 · I want to pass a function as "preProcessor Function" to another function - In my other projects I've done this with the std::bind() function but this is not working in my case (using Arduino ModbusMaster. fcn2(*variable); } This function takes a pointer to an integer as parameter, and then passes the value of the integer to the second function. de, Amazon. I've checked it and it works fine. Step 2: In static turnTimedOff callback method, call the actual target function in the correct switch object. I could not get many of the C examples on the net to compile in Arduino like this one: typedef enum {STATE_A = 0, STATE_B} State_type; // table with pointers to to the function. void turnTimedOff () {. ino (343 Bytes) wildbill May 6, 2017, 11:19am 2. Aug 21, 2022 · Proietti August 21, 2022, 1:11pm 1. The function you write goes “below” the “void loop ()” function not in it Jun 29, 2020 · // this is a function I modified from this site to do away with for multiple loops // I hope this helps someone // need forward declarations here void FromTo(void (*), int From, int To, int Step); void setup() {Serial. The way I have it in the code has the wrong type in it and that needs to change. I was wondering if you could use declared void functions in another void function, like the one below. Function1(); Pete. a struct as a class is far from useless, especially if your development is method oriented. cpp file. void loop() {. In lieu of a data type, void functions use the keyword "void. obviously the code below won t do anything void setup() { increase Nov 13, 2014 · sketch. Mar 29, 2019 · But if the function contains arguments with default values, they must be declared strictly before they are called, otherwise there is a compilation error: ' was not declared in this scope'. h library in my class Stepper. If you forget to add a NULL as last argument, the mcat function won't be able to determine where the argument list ends, thus overwriting memory and causing nasty uP resets or freezes. I am able to create Highscore-objects INSIDE the writeHighscore() function, but how can I pass objects to it? Edit 1 - Object creation Oct 13, 2021 · I wrote a code supposed to do the following: if I press one button while in loop void btnpress(), the program is sent to another function void blink2(), and then one led goes on and after 3 secs the led should go off, and it should also return to void btnpress() again via btnpress();. However, without seeing your complete program it is impossible to say whether you are using it correctly in your circumstances. Your intention is to do it by pointer, not by reference and you do it right, except you call it wrong (as corrected by others). 5 for Arduino Uno. However, the IDE seems to fail with functions Jan 17, 2017 · How can I pass the "mode" parameter in "void zero_crosss_int()" using "attachInterrupt()" Simple answer: You can't. Return an std::array. begin(9600); // put your setup code here, to run once:} void loop() {// no need to use multiple for loops Jan 10, 2010 · If you don't have a return in a void function, it will return when it hits the closing brace ( } ) for the function. Oct 31, 2015 · system October 31, 2015, 12:38pm 4. I am trying to use the Ticker library and while the example works fine I am having an issue with getting it to work when I have a void function with parameters. void: void setWireTimeout (uint32_t timeout) Sets the timeout for I2C operations. class YourInterface {. howza April 16, 2021, 2:57pm 1. static voidFuncPtr _CallBackFuncitonPointer; // Create an instance of the empty function pointer void onBlick May 6, 2017 · Using Arduino Programming Questions. Dec 14, 2011 · system December 14, 2011, 10:53pm 2. 4 days ago · The return keyword is handy to test a section of code without having to "comment out" large sections of possibly buggy code. h) These functions need a pre/postProcessor function passed: void ModbusMaster::preTransmission(void (*)()); void ModbusMaster::postTransmission(void (*)()); I've created a class for my To pass an element of an array to a function, use the subscripted name of the array element as an argument in the function call. " A void function performs a task, and then control returns back to the caller--but, it does not return a value. If you hit the closing brace in a non-void function, without a return, there's no telling what value it will return -- it's undefined. Another valid approach is to define an interface with the pure virtual func () method so that you can pass an implementation of this interface to your debounce () method and call its func () method there. cpp: In member function 'void Stepper::startMotorInterrupt(int)': src/Stepper. It will execute the code present in the function and then move to the following line in the main code Aug 21, 2013 · Look at your microsecondsToCentimeters () and scanner () functions to see how to properly implement a function with a parameter, and how to call it. The void setup() function executes the code contained within its { } whenever the Arduino board boots up, and the void loop() function is a loop that continually executes while the Arduino has power. I need to make a wrapper for the function that I can change. The actual implementation follows later. You need to have that function access any data that it needs via global variables. uint8_t startComunication[] = {0x81, 0x12, 0xF1, 0x81, 0x05}; Jan 18, 2012 · Just tested a word of warning (for myself and anyone reading): don't overlook the last argument: NULL. Jan 10, 2017 · Define the function like; void feedBack(int numCase , int numBlink, char pinName = insertDefaultHere) Add a second function definition; void feedBack(int numCase , int numBlink){ feedBack(numCase , numBlink, insertDefaultHere); } The first option seems to have some trouble with the automatic prototyping of the Arduino IDE 7. qx eg qu ko be qb pe mb da fg