Have also looking into this and haven't got the R3 bootloader on the R2 since it seems to be a little tricky.PSIG wrote: ↑Tue Aug 07, 2018 7:45 pmUNO R2? I don't recall when they went from the old 2kb to the newer 0.5kb bootloader but Ardu-Stim nearly fills an R3's flash, and the old bootloader size would make the difference too small. Maybe that's it? There may be some clue in the verbose output on compiling between available space and compiled code size, or load Blink and see how much space remains and calculate it. If it loads onto a Mega, then the code is good, and you may need to load a new bootloader on your old R2. Maybe.
Regarding the Verbose and space available:
Sketch uses 30042 bytes (93%) of program storage space. Maximum is 32256 bytes.
Global variables use 1128 bytes (55%) of dynamic memory, leaving 920 bytes for local variables. Maximum is 2048 bytes.
It should be enough no? Even with R2 bootloader. ("30042 bytes (93%) of program storage space" is without bootloader?)