For C programmers

Question

How to create class or library in C programming for Arduino

Answer 1

I'm not an Arduino Expert but after searching a bit on the web i found some articles that may help you in your journey.
And before that, C doesn't support classes.

1 - https://www.circuitxcode.com/creating-arduino-class/
2 - https://www.arduino.cc/en/Hacking/LibraryTutorial
3 - https://www.radishlogic.com/arduino/use-c-class-arduino-ide-without-creating-library/

If you're aiming to create classes then use C++.

Answer 2

Sorry but you can't create Class in C language. If you know C programming then it's very very easy for you to shift to C++ language. You can create classes, objects, and separate library in C++.

Answer 3

You can create structs with C but you will struggle with encapsulation.