Скачать или смотреть Resolving the Serial.write Issue in Arduino

Learn how to effectively use the Serial.write() function in Arduino to send variables and strings without error.
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This video is based on the question https://stackoverflow.com/q/62708913/ asked by the user 'Tephs' ( https://stackoverflow.com/u/12665017/ ) and on the answer https://stackoverflow.com/a/62708956/ provided by the user 'NAGA RAJ S' ( https://stackoverflow.com/u/10835136/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Serial.write Function in Arduino

If you're working with Arduino and trying to communicate with Python or other applications, you might have come across an issue when using the Serial.write() function. This function is essential for sending data over the serial interface, but it can be frustrating when you encounter errors. Let's dive deep into the problem and see how we can resolve it.

The Problem

You might experience an error when you try to send a variable using Serial.write(). Here’s an example of the code that can lead to confusion:

[[See Video to Reveal this Text or Code Snippet]]

When you run this code, you might see an error message similar to:

[[See Video to Reveal this Text or Code Snippet]]

This error occurs because Serial.write() cannot accept a String type directly. Let's explore why this happens and how we can fix it.

Breaking Down the Solution

Understanding Data Types

The core issue relates to how data types are handled in Arduino:

Serial.write() is designed to handle bytes or character arrays (C-style strings).

The String type in Arduino is a more complex object—even though it represents a sequence of characters, it is not directly compatible with Serial.write().

Sending Strings with Serial

To send strings effectively, you have a few options:

Directly Send a String Literals:
If you're sending a predefined string, you can simply use:

[[See Video to Reveal this Text or Code Snippet]]

This works because the string is implicitly treated as a character array, which is compatible with Serial.write().

Use a Char Array:
If you're working with variables, consider using a character array. Here’s how you can send a character array:

[[See Video to Reveal this Text or Code Snippet]]

This method sends the string as a series of bytes.

Sending Each Character Individually:
If you need to send a String object, you can iterate through each character and send them one-by-one. Here’s a function that accomplishes this:

[[See Video to Reveal this Text or Code Snippet]]

By using this function, you can effectively send any string contained within the String type.

Example Implementation

Here’s a complete implementation using the above solutions:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Using the Serial.write() function in Arduino is powerful for communication, but understanding how to use it with different types of data is crucial. By employing one of the methods discussed above, you can send strings and variables without encountering errors.

Remember, whether it's a direct string, a character array, or sending characters one by one, choosing the right method is key to successful serial communication. Happy coding!