This is a bare Makefile project sample to work with ino files, and makes use
of the arduino-make/arduino-mk Makefile framework that aims to provide all of
the IDE functionalities but via a Makefile.

See https://github.com/sudar/Arduino-Makefile

Once installed you need to set at least these two env variables to be able to
use the Makefile:

  export ARDUINO_DIR=/usr/share/arduino
  export ARDMK_DIR=/usr/share/arduino
  
Adjust to reflect your own paths! Put that in your shell rc!