Arduino Error Does Not Name a Type: How to Fix?

Arduino Error Does Not Name a Type: How to Fix?

If you’ve ever encountered the dreaded Arduino Error – ‘does not name a type’ – you know how frustrating it can be. Fortunately, there’s no need to panic; this problem is easy to fix. In this blog post, we’ll explore what causes the Arduino error ‘does not name a type’, and provide step-by-step instructions on how to solve it. We’ll also go over some best practices for avoiding similar issues in the future, so that designing with Arduino becomes smoother and less time consuming!

What Is Arduino?

Arduino is an open-source hardware and software platform designed for users to easily create interactive projects.

It consists of a microcontroller board, programming language, and integrated development environment (IDE). The Arduino IDE allows you to quickly write and upload code to your microcontroller board which can then be used to control sensors, motors, lights, and other devices.

What Is Arduino?

Using the Arduino platform is a great way for makers and engineers to quickly prototype their ideas. Unfortunately, it’s not always easy. One common error that Arduino users may encounter is the ‘does not name a type’ error. Let’s take a look at what this error means and how it can be fixed.

What Does ‘Does Not Name a Type’ Mean?

The ‘does not name a type’ error is an indication from the Arduino IDE that it was unable to find a definition for something that you’re trying to use. The most common cause of this error is when you are trying to declare or use a variable or function that doesn’t exist.

For example, if you try to use a variable called myVariable without first declaring it in your code, the compiler will return an error saying “myVariable does not name a type”. This means that the compiler couldn’t find any information about what kind of data type myVariable should be (e.g., int, char, etc.). [1]

What Can I Do To Fix The Arduino That Does Not Name A Type Error?

1. Download The Library Folder

One of the most common causes of the ‘does not name a type’ error is when you are trying to use a function or library that isn’t included in your Arduino installation. To fix this, you need to download and install the correct library folder for your project.

2. Check For Typos & Spelling Errors

Sometimes, this error can be caused by a simple typo or spelling error in your code. Check all variable and function names carefully to make sure they are spelled correctly.

3. Check Function Parameters

Similarly, if you are using a function with incorrect parameters (e.g., wrong data types or incorrect values), then this can also cause the “does not name a type” error. Make sure you are passing correct values to the function. [2]

4. Check Variable Data Types

Finally, if your code is using multiple data types (e.g., int, char, etc.), then it’s important that all variables are declared with the same type. If a variable is declared with one type but used as another, this can also cause the “does not name a type” error.

By following these steps and understanding what causes the ‘does not name a type’ error in Arduino, you can quickly fix any errors that occur in your project and get back to creating amazing things!

What Can I Do To Fix The Arduino That Does Not Name A Type Error?

Wrong Paths To Fix ‘Does Not Name A Type’ Error

Although the above steps should help you to fix any ‘does not name a type’ errors, there are some wrong paths that you should avoid.

One common mistake is to simply delete the line of code where the error occurred.

While this may seem like a quick fix, it can actually cause more problems down the line if other parts of your code rely on this information.

Another wrong path is trying to guess what kind of data type your variable should be declared as. This can lead to unexpected results and potential bugs in your program. It’s best to always double check that all variables have been properly declared with their correct data types before running your code. [3]

Pros And Cons Of Arduino Error Does Not Name A Type

Since Arduino is an open-source platform, there are many advantages and disadvantages associated with using it. One of the most common errors encountered with Arduino is the “Does not name a type” error. This can be frustrating to troubleshoot, but understanding some of the pros and cons of this error can help you better understand how to fix it.


  • It is rare for this type of error to cause serious damage or impact on the system as a whole.
  • In most cases, this kind of error can be fixed relatively quickly by simply correcting the code or replacing faulty components.
  • Being able to identify and solve problems like these quickly will make you a more experienced Arduino user.


  • If not fixed, this type of error can lead to further problems and impede the functionality of the project.
  • Troubleshooting and debugging this error requires a good understanding of Arduino hardware and software, which may be time consuming for beginners.
  • It can also be difficult to determine exactly what is causing the error without sufficient knowledge of the code being used.

By becoming familiar with the pros and cons associated with fixing an Arduino “Does not name a type” error, you will be able to troubleshoot more efficiently and effectively in order to get your project up and running again. With enough practice, you will soon become an experienced Arduino user who can tackle errors like these quickly and confidently. [4]

Benefits of Arduino

The Arduino platform is a popular choice for many hobbyists and professionals due to its flexibility, low cost, and ease of use. It provides users with access to a large variety of sensors and components that can be used to create a wide range of projects. Additionally, it has an open source codebase which allows users to customize the code to fit their needs. The Arduino board also allows the user to interface with various types of external devices such as LCD screens or servos. This makes it possible for people to design complex projects using only the hardware they have on hand.

Benefits of Arduino

Furthermore, because Arduino is open-source and compatible with other programming languages like Python and C++, this means that users can easily modify existing programs or develop their own. Additionally, Arduino has a wide range of tutorials and online communities that provide support for users who are just getting started with the platform. This makes it easy to learn how to use the platform and quickly create projects.

Finally, the Arduino IDE allows users to easily sketch out code and upload it directly onto an Arduino board. This makes it much easier for people to program the board without writing a single line of code manually. The IDE also offers debugging capabilities which can be used to quickly identify errors in programs before they are uploaded onto the board. With all these features combined, Arduino is a powerful tool for anyone looking to get started with electronics or advanced robotics projects.

Cons of Arduino

Arduino is an incredible platform for beginning hobbyists and professionals alike, but there are some drawbacks to using the technology. One of the most common issues encountered by Arduino users is the “does not name a type” error. This error occurs when the compiler cannot recognize a type that has been declared in code. While this can often be caused by incorrect syntax or misspelled words, it can also arise out of complexity within more advanced projects.

In addition, Arduino has limited memory capacity and only works with certain types of microcontrollers; this can make working on larger projects difficult or even impossible.

Finally, some might find that Arduino programming languages (such as C++) take longer to master than other platforms’ languages do, which could add to the time it takes to develop a project.

Fortunately, there are ways to work around the “does not name a type” error and other issues that arise while working with Arduino. [5]

Cons of Arduino

Tips on Using Arduino

  • Understand the Basics of Arduino: The best way to prevent most Arduino-related errors is to have a good understanding of the basics of Arduino. This includes knowing how to set up an Arduino board, what kind of components can be used with it, and how they interact with each other. Having this knowledge will help you troubleshoot any errors that may occur while using your Arduino board.
  • Keep Your Board Clean: A dirty or dusty board can cause all kinds of problems for your program, including the “does not name a type” error. Make sure to keep your board clean at all times and inspect it frequently for any dirt or dust accumulation that could be causing problems.
  • Check All Connections: A loose connection between components or the board itself can be another cause for the “does not name a type” error. Check all of your connections and make sure that everything is securely connected and tight.
  • Use Proper Syntax: Make sure to always use proper syntax when programming with Arduino. Incorrect syntax can lead to errors like this, especially if you are improperly using data types or declaring variables incorrectly.
  • Read Error Messages Carefully: When an error occurs, take a look at what it says carefully and determine where it might be coming from. This can help narrow down the source of the error and will make troubleshooting much easier.
  • Update Your Firmware: Finally, make sure to always keep your firmware updated. Outdated firmware can cause all sorts of errors and problems, so it’s important to stay up-to-date on the latest version.

Following these tips should help you prevent or fix most Arduino-related errors. If you’re still having trouble with the “does not name a type” error, try looking for answers online or reach out to an expert for further assistance.

Tips on Using Arduino


What does Arduino not name a type mean?

This error occurs when the compiler cannot recognize a variable or function as a valid type, meaning that it does not know how to handle them. This could be due to a missing library, incorrect spelling, improper syntax or incorrect capitalization.

How do I fix the Arduino not name a type?

First, you’ll need to check the code for any typos or incorrect syntax and make sure all the libraries are included properly. You can also check if there is an outdated version of your library installed and try updating it. If this doesn’t work, you can try creating a new instance of the object or changing the name of the object. Finally, make sure that all objects have been declared before they’re used in your code.

What does != Mean in Arduino code?

The “!=” operator in Arduino code means “not equal to.” This is a comparison operator used to evaluate if two values are not the same. In an Arduino program, this operator can be used to check whether a variable has a certain value or not. For example, you could compare two numbers using != and then execute some code depending on whether they’re equal or not. It could also be used to check if a string matches another string or if an object contains the desired property. This operator can save you from writing long and complex boolean logic evaluations when dealing with comparisons. In addition to the != comparison operator, other operators like == (equal to), > (greater than), < (less than) , >= (greater than or equal to) and <= (less than or equal to) can also be used when writing Arduino code.

Using the comparison operators properly is important for ensuring your program works as expected. If you make a mistake in your comparisons, it could lead to unexpected behavior.

For example, if you use “=” instead of “==” you won’t get an error message but the comparison will evaluate to false even if the values are actually equal. To avoid this kind of mistakes and ensure that your program works correctly, always double-check all comparison operators before running your Arduino code.

How to solve a fatal error in Arduino?

If you’re getting a fatal error in your Arduino code, it means there is a syntax or logical error that the compiler cannot fix. The common causes of such errors include incorrect spelling, missing semicolons and other similar issues. To solve this kind of problem, you first have to find out what exactly is causing the error. You should start by reading through the code and looking for any errors. If you can’t detect any mistakes, try using an online tool like Syntax Highlighter to view your code with color-coded formatting. This will often make it easier to spot typos and other issues. Once you have identified the source of the problem, fix it accordingly then re-upload your program to see if that resolves the error. If you are still getting the same fatal error, try commenting out sections of code one at a time until you find the part that is causing the problem. Once you have identified and fixed the issue, your Arduino program should run correctly.

How to change the Arduino USB name?

The USB name of your Arduino board is used to identify it on your computer. You can change the Arduino USB name by editing the ‘boards.txt’ file in the Arduino installation directory. To locate this directory, open the Arduino IDE and go to File -> Preferences. Look for “Sketchbook location” towards the bottom of this Preferences window; this is where you’ll find your boards.txt file. Open the boards.txt file with a text editor such as Notepad or Wordpad; use caution when making any changes to this file, as it is important for proper functioning of your Arduino board. Look for a line that contains the word “name” inside quotes (for example: name=Arduino Uno). Change the name inside quotes to whatever you want, save the file and restart your Arduino IDE. The new name will now be shown as the port in either the Tools -> Serial Port menu or in the bottom-right corner of your Arduino window when you plug it in.

Can Arduino be damaged?

Arduino boards are fairly robust, and it is unlikely that you will damage your board by connecting or disconnecting components, although care should be taken to ensure proper connections.

If you find that your board isn’t functioning correctly after trying to reprogram it or attach a component, make sure all of the connections are secure.

In some cases, if the Arduino was connected to a power supply with too much voltage, this could cause permanent damage and render the board unusable. To avoid this issue, always check the voltage of any external power supplies before plugging them into your Arduino board. In conclusion, understanding how to identify and troubleshoot Arduino errors can help ensure that your projects run smoothly. Although many errors can be fixed easily with a few simple steps, it is important to be aware of the potential risks associated with modifying the boards.txt file or connecting external components, as these changes can have lasting consequences on your Arduino board and its performance.

Useful Video: servo does not name a type; did you mean ‘Serial’ ?.Arduino Programming code Error fix


The Arduino error “does not name a type” can be frustrating, but it is usually easy to fix. By ensuring that the correct libraries and cpp files are included in your sketch, double-checking for typos or spelling errors, and correcting any syntax mistakes, you should be able to resolve this issue quickly. Additionally, if you’re having trouble with an unknown data type or pointer error, make sure that the keyword “volatile” has been added where needed. With a bit of patience and attention to detail, you can have your project up and running again in no time!
Good luck!