In [[Configuration mode]], if you click the [[File:Plus.png|middle]] icon to add a trigger to a [[Stop]], [[Coupler]] or [[Combination]] in the usual way, then the screen will wait for you to press the new input button. Assuming everything has been wired up correctly, the screen will then confirm which button you pressed.
== Plugging in a breakout board ==
The other possibility is dedicated Gpio board like a [[Status Board]] from The Pi Hut. This comes pre-wired with sockets for buttons, and LEDs to indicate which controls are active.
== Sharing Gpio inputs with another application on the Pi ==