Arduino Error Codes: What Do They Mean? Solved Now

 Discover what the different Arduino error codes mean and how to fix them. Get back to creating amazing projects with confidence.

Introduction

If you're working with an Arduino board, you may have encountered some error codes that can be confusing at first. These codes are meant to help you identify what went wrong with your code or circuit. In this article, we will go over the most common error codes that you may come across and what they mean.

Common Error Codes

Error: 'name' was not declared in this scope

This error message usually occurs when you have not declared a variable or function that you are using in your code. To fix this error, make sure to declare all your variables and functions before you use them.

Error: expected ';' before '}' token

This error message usually means that you forgot to add a semicolon at the end of a line of code. To fix this error, add a semicolon at the end of the line where the error occurred.

Error: expected primary-expression before '.' token

This error message usually occurs when you are trying to access a member of a struct or class incorrectly. To fix this error, make sure to use the correct syntax for accessing members of structs or classes.

---

Speed Control of DC Motor using Arduino and L293D Motor Driver

---

Error: 'function' was not declared in this scope

This error message usually occurs when you are trying to call a function that has not been declared. To fix this error, make sure to declare all your functions before you call them.

Error: 'type' does not name a type

This error message usually occurs when you have misspelled the name of a type or have not included the header file that defines the type. To fix this error, make sure to spell the type correctly and include the appropriate header file.

Error: 'variable' was not declared in this scope

This error message usually occurs when you are trying to use a variable that has not been declared. To fix this error, make sure to declare all your variables before you use them.

Error: 'function' is not a type

This error message usually occurs when you are trying to use a function as a type. To fix this error, make sure to use the correct syntax for defining variables with function pointers.

Error: too few arguments to function 'function'

This error message usually occurs when you are calling a function with too few arguments. To fix this error, make sure to provide all the required arguments when calling the function.

Error: too many arguments to function 'function'

This error message usually occurs when you are calling a function with too many arguments. To fix this error, make sure to only provide the required arguments when calling the function.

Error: redefinition of 'variable'

This error message usually occurs when you are trying to define a variable more than once. To fix this error, make sure to only define each variable once.

---

How to Know the NodeMCU IP Address for Your Next IoT Project

---

Error: expected unqualified-id before '(' token

This error message usually occurs when you have a syntax error in your code. To fix this error, check your code for any syntax errors and correct them.

Error: 'class' has no member named 'member'

This error message usually occurs when you are trying to access a member of a class that does not exist. To fix this error, make sure to use the correct name for the member or add the member to the class.

Error: 'function' was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation

This error message usually occurs when you are trying to use a function that has not been declared and there are no declarations found by argument-dependent lookup. To fix this error, make sure to declare the function before you use it or include the appropriate header file that defines the function.

Error: expected initializer before 'variable'

This error message usually occurs when you are trying to define a variable without providing an initializer. To fix this error, make sure to provide an initializer for the variable.

Error: 'class' has no member named 'function'

This error message usually occurs when you are trying to call a function that does not exist in a class. To fix this error, make sure to use the correct name for the function or add the function to the class.

 

Conclusion

Arduino error codes may seem intimidating at first, but they are actually helpful in identifying issues with your code or circuit. By understanding what these error codes mean, you can quickly diagnose and fix any problems you encounter. Remember to always double-check your code for syntax errors and to declare all your variables and functions before you use them.

FAQs

1. What should I do if I encounter an Arduino error code that is not listed in this article? If you encounter an error code that is not listed here, try doing a quick search online or consulting the Arduino documentation for more information.
2. How can I prevent Arduino error codes from occurring in the first place? One way to prevent errors is to double-check your code for syntax errors and to declare all your variables and functions before you use them. It's also a good idea to test your code frequently and make small changes at a time.
3. Why do Arduino error codes occur? Arduino error codes occur when there is a problem with your code or circuit. This can include syntax errors, missing declarations, or incorrect usage of functions or variables.
4. Can I ignore Arduino error codes? While it may be tempting to ignore error codes, it's important to address them as soon as possible to avoid further issues with your code or circuit.
5. Is it possible to customize Arduino error messages? Yes, it is possible to customize error messages in Arduino by modifying the relevant code in the Arduino IDE or by using a custom library. However, this should only be done by experienced users who understand the implications of modifying the Arduino source code.