### Main header
MTD2A.h

### Global constants, base class and common functions
* MTD2A_const.h
* MTD2A_base.h
* MTD2A_base.cpp

### Classes and doxygen documentation
* MTD2A_binary_input.h
* MTD2A_binary_input.cpp
* MTD2A_binary_output.h
* MTD2A_binary_output.cpp
* MTD2A_timer.h
* MTD2A_timer.cpp

### Additional planned building blocks
*	MTD2A_tone
*	MTD2A_sound	
*	MTD2A_display
*	MTD2A_DCC_input
*	Suggestions are welcome
