I don't know if this is the corect sub-forum to post this but anyway!
So i made a nice sketch to use with an led pannel and i would like to use an attiny85 but i don't know how to check if the sketch is too big!
So how can i check the size of a skech?
Last time I downloaded a program to an Arduino, the IDE told me the size and remaining memory. What message did you get?
You don't even need to do an upload if you don't currently own the ATtiny85. You can just select the ATtiny85 board from the Tools > Board menu and then do a Sketch > Verify/Compile. The program memory usage and dynamic memory used by globals (but note, not by local variables) will be displayed in the black console window at the bottom of the Arduino IDE window.