The great thing about Arduinos is that they are so easy to interface to the outside world – to monitor the state of sensors and to control actuators and make things happen. As part of this, you often need to add a few components or circuits of your own, and the best way to do this is by means of a prototyping (proto) shield. Unfortunately, most proto-shields don’t make it particularly easy to actually connect wires to and from the outside world. Universal Screw-Block Proto-Shield System for Arduino– which works with Uno, Leonardo, Due, and Mega Arduinos (and also their chipKIT counterparts) – addresses this issue by means of its easy-to-use screw-block terminals.
The Universal Screw-Block Proto-Shield System for Arduino features two boards. The Master Board fits on Arduino Unos and Leonardos. If you are using a Due or a Mega, you will also require the Expansion Board.