This library uniformly encapsulates the use of different types of switches for user input devices. The library is easily extended for additional switch types through a class hierarchy and inheritance model, following the code for existing switch types.

The library includes the following features:

Software debounce for all switch types.
Automatically detect switch press, double press, long press and auto repeat.
Can work with low/high or high/low transitions.
All software timers are configurable for fine tuning to specific applications. These include:
- debounce time.
- double press time.
- long press time.
- auto repeat period time.

Switch arrangements handled by the library are:

Momentary on type switches (MD_Switch_Digital class)
User managed signals eg, I/O expanders (MD_Switch_User class)
Analog resistor ladder switches (MD_Switch_Analog class)
Keypad matrix (MD_Switch_Matrix class)
Keypad matrix using 4017 IC (MD_Matrix_4017KM class)