Configurable little countdown with binary display ot the counter.

François Pessaux (c) 2015
This piece of code can be freely modified and/or modified.

Compiling with the Makefile
---------------------------
* Rename (or symbolic-link) the TD12-4.ino into TD12-4.c.
* In the TD12-4.c, according to the comment, uncomment the line
    #include <arduino.h>
* Config the Makefile to fit your Arduino development environment.
    ARDUINO_BASE
    PORT
    BOARD
* Invoke
    make compile
  then
    make upload
* To clean, invoke
    make clean
