To fix Arduino upload error, make sure you've selected the right board in the Arduino IDE, remove pins from the board, and reset the board.

Using MiniCore with Arduino 1.8.13 with no issues. Upgrade to 2.0.0 (and using all the same settings) still builds properly but the upload fails with the single error message " A programmer is ...

Configuration Operating system: LSB Version: :core-4.1-ia32:core-4.1-noarch Distributor ID: Fedora Description: Fedora release 24 (Twenty Four) Release: 24 Codename: TwentyFour PlatformIO Version ...

It is a standalone, non-networked app that isn't very pretty to look at. But what if you want to share code and upload programs right from your browser? That's where CodeBender.cc comes in.