Talk:Update 0.15.0/@comment-27786496-20160503130842/@comment-27786496-20160503131530

Never mind I found out. Just to answer my own question so then none of you have to look it up, a BUD switch (BUD standing for Block Update Detector) activates pistons when there are block updates happening around it. For example if I were to place cobblestone two blocks away from the piston, it would turn on.