Adding an external .c file to an .ino project

Using Arduino IDE 1.x
1

When creating a sketch in Arduino IDE (1.8.19) I'm getting a skeleton with setup() and loop().
I assume, when I want to include a .h file, I simply put it into the directory where the .ino file is located. But assumed I have some driver code in a extra external .c file, where do I put this file and how do I make the arduino IDE becoming aware of it so that it is included (linked) to my main program?

2

Put everything in the same folder.
If the .h files and the .c files have the same name the compiler/linker will find them.

3

try renaming it to ino file and put it in current folder

4

Thanks. Renaming the .C file to .ino seems to work.

5

Putting just the files there and leaving them named .C doesn't link the .C file.

6

Often it's a matter of renaming .c to .cpp

7

If you want to add C language source files to your sketch, make sure to use the .c file extension (not .C with an uppercase "C"). C language files are supported, but in most cases I think it is easiest to use .ino, or .cpp if you really don't want the Arduino sketch preprocessing done on the code.

8

Thanks for pointing that out. Actually writing .C (upper case) was only a lazyness on my side. I did not really mean to write it upper case. But good to know.

9

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