This link has details including:
- software library installation for use with Arduino, Particle and Raspberry Pi boards
- list of functions available in these libraries
- a demo program (which shows the usage of most library functions)
- info on keypads that work with this software
- hardware design for a backpack board for keypads, available on github
- info on backpack “bare” pc boards available from OSH Park.
License Information License Information is here.