I am currently working on an airsoft time bomb with a horn speaker for when it goes off.
I once saw this in a project on Youtube where a person had 2 USB keys for a Domination mode.
If one USB key was plugged into the bomb, the bomb knew this team currently had the bomb.
If the other key was plugged in, the timer of the first team stops and the other team gets points.
The first team that reached a certain amount of points won.
What do I need to get input like that from USB keys to my Arduino?