RM4 is a library for interfacing with 4-channel RF receivers, like the RM4SG-M. These receivers are paired with 4-button keyfobs.
The RM4 library provides a class, RM4, that provides a convenient interface
for translating the four data pins into a 4-bit button code. An example,
show_buttons.pde, is provided to demonstrate how to use RM4.
The module on which RM4 is based, and the configuration in which the example is run, is shown in the picture below.
