One of the great things about Arduino systems is they enable us to try ideas and experiment with concepts. At a software level this is simple – write, compile and download. Hardware components, however, can be more time consuming as you either have to wire up a temporary breadboard or you have to build dedicated circuits.
There is a simple way to make the hardware more ‘plug and play’ by building small modules with a simple standard interface that can be combined to create bigger systems. The outcome is a library of standard modules that are easily connected to the Arduino to prototype ideas without fiddling with breadboard wires for the simple stuff.