As Jerry and Jack said, this is not exactly a cakewalk.

Yes,it is a trivial matter to drive the display; there is basically one library to handle many different displays. This is true no matter what the display chip, as long as one accounts for the right one. Of course, graphic displays have such things as fonts to help fill up space in the mcu.

The problem is having enough room for the other functions. There is enough flash ram to accomodate many functions, but it is easy to overflow the limited amount of sram and give very strange results. One easy way is to call nested subroutines. Another is to have too many successive interrupts. These are not easy to predict. Hence the suggestion for a larger more capable mcu (like the 2560 or the Teensy). Yeah, you gotta learn something more...so what else is new? Etc...

Yes, the Nano can handle some more functions. But one never knows until the event when one more is too many. And these are among the hardest things to troubleshoot in all computers.

john
AD5YE