This shield will allow an Arduino to interface with a PS2 Controller. Wired or wireless. I had two uses in mind. 1. Some type of robot arm where a large amount of servos are used. 2. RC vehicle where a motor driver plus servos would be required. A total of 18 pins have server pinouts. Keep in mind that depending on how it is used, some of those pins will be used for data.https://www.tindie.com/products/ron/arduino-shield-for-ps2-playstation-2-controller/