Скачать или смотреть How to Use Functions to Display LCD Text in Arduino Projects

Discover how to efficiently use functions to display text on an Arduino LCD. Learn troubleshooting tips and techniques to create a number picker interface.
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How to Use Functions to Display LCD Text in Arduino Projects

When working with the Arduino platform, one of the common goals is to display information on an LCD screen. However, sometimes you might encounter challenges, especially when trying to print specific strings, like a number picker, onto your display. If you’ve found yourself wondering how to effectively write text to an LCD using a function, you're in the right place! In this post, we’ll explore how to solve a common issue with printing text on an LCD and how to structure your code correctly using functions.

Understanding the Challenge

In this scenario, the issue arises from wanting to show numbers “0 to 9” using an 'X' to select a number. For example, you might want the output to look like 01234567x9 or 0123x56789. The code provided attempts to print this onto the LCD, but continuously writes the same text repeatedly due to its placement in the loop() function. Additionally, there is a misunderstanding regarding function arguments when creating a custom print function.

Breaking Down the Solution

Step 1: Improve Your Print Function

The function PrintText() is causing an error because it is defined to take no parameters, yet you are trying to call it with an argument. Here’s how to modify that:

Original Code

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Fixed Code

Simply remove the parameter when you call the PrintText() function.

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Step 2: Call the Function at the Right Time

As for the issue of continuously printing "Hello World":

You can relocate the PrintText() function call to the setup() method instead of placing it in the loop(). This way, the text will be printed only once when the Arduino starts up, rather than repeatedly every loop iteration.

Modified Setup

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Considerations for Future Functions

If you want to make your PrintText() function more flexible, you could consider defining it to accept a const char * parameter, allowing you to pass different strings to be printed:

Example Flexible Function Definition

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Then, you could call it like this inside your loop() or setup() to print different strings whenever needed.

Conclusion

Using functions to control how you print text on an Arduino LCD can streamline your code and enhance clarity. By defining your function correctly and calling it at appropriate times in your program, you can avoid issues like infinite loops of text printing. This way, you can focus on creating more interactive projects, like number pickers with LCD displays.

If you follow the modifications outlined here, you should have a fully functioning LCD text display for your Arduino project. Happy coding!