It's time to test the whole system!
First, make sure the 12V supply for the actuator is plugged in.
Power up the two Feathers using their respective on/off switches. You'll see the red lights stay on when powered. The drawer will got through it's boot sequence of opening and closing.
Now, you can place the two designated pieces -- here a rook and pawn -- onto the board spaces -- here g3 and h3. After a moment, the drawer will mysteriously open!
When you are ready to reset it, you can either power the drawer Feather off and on, or simply use the ring's two tags to close it. You're ready for your next puzzle solver!