i want to show different animation string for 3 of 8x8 dot matrix at the same time. really no idea, because all the tutorial is show a animation string in the same. How to make it to show different pattern in the 3 of dot matrix in same signal?
As I said in my previous post, look at Parola if you want to have message on the display. If you just want to treat the 8x8 displays as individual smaller display (independent), then the transformation functions in my MD_MAX72xx library (link below in the repository). Read the documentation for the library.
You will not find examples to do exactly what you want because it is pretty unusual!