Add-on module for your Arduino mainboard mainboard not supplied Large 0.1-inch spaced prototyping grid 14 pin SMD footprint 50 millimetres pitch 20 pin through hole footprint 100 millimetres pitch Once youve bought your first main Arduino board its time to start adding additional functionality with the use of extra modules referred to as shields. The Arduino Prototyping Shield makes it easy for you to design custom circuits. You can solder parts to the prototyping area to create your project or use it with a small solderless breadboard not included to quickly test circuit ideas without having to solder. Extra connections are provided for all of the Arduino IO pins & there is space to mount through-hole & surface mount integrated circuits. The Prototyping Shield provides a convenient way to make your custom circuit & Arduino into a single module.