This is a motion activated drawbridge with an LCD display of system status. Designed to the exact specifications of motion activated drawbridges from historic times.
I used a paper clip as a hinge for the drawbridge, (2) M4 nuts for extra weight to pull the door down, and some braided fishing line as the ropes to raise and lower the bridge. You'll have to mess with the servo a little bit to get it in the right place for functionality. Fun project. Enjoy!