"Basic with Callbacks" example. Works fine for Nano, but fails on the Arduino Mega 2560 - it can't compile the sketch Build options changed, rebuilding all In file included from /Users/redacted/Lib ...

I have purchased an arduino nano and an Ethernet shield, however when i try to upload the sketch it says error compiling for board arduino nano. my arduino is most likely ...

How to fix ‘was not declared in the scope’ error? There are the quick fixes for the Arduino error: was not declared in the scope. Declare the variable Before assigning a value to the variable, make ...