The second door was a mirror image of the first and required two linear actuators. One moves the bookcase door along with the slides, and one pivot around the hinges. Four 8” linear actuators were used to move both doors. These have sufficient force and speed in a compact size. Pinch free if a person or object is between the closing doors.Ī key component was the Progressive Automations PA-14 linear actuator.Emergency ingress/egress in case of power/Arduino failure.Lower the electric power use when in standby mode.Automatically close the doors if no motion is detected in the room for 2 hours.Include internal manual switches to open/close the doors.The external open switch should be hidden. Create a reliable fully automatic "open and close" mechanism for both door hinges/sliders. Phase 2 included adding the linear actuators to open and close the doors automatically. Phase 1 of the project included the building of the secret door. Our PA-14 linear actuator was the core component for this project. An open bookcase secret door defeats the whole purpose.The door was left open most of the time, exposing the hidden room behind the bookcases.To open, the bookcases slide apart slightly, and pivot inward into the ‘secret lair’, then sliding outward to not block too much space inside.įor more information on that part of the project, and to see the hinges for the secret bookcase door, visit the Instructables post.īruce McArdle’s reason for automating the hidden bookshelf doors was two-fold: The bookcases were handmade to support fully loaded shelves and have a unique hidden door mechanism (a hinge and slide), so the bookcases look like they are resting against the outside wall. There are three main components to this project, namely, an Arduino microcontroller, a motor controller, and linear actuators, which were used to enable the automatic opening and closing of a pair of doors (i.e., bookshelf secret doors).
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