Servo Door Lock

This project uses a servo motor that physically moves a door lock. The servo will be turning left and right when powered, but the power is connected by a button instead of code.

It works like

• When the button is pressed, the servo is powered and starts rotating back and forth, moving the lock mechanism.
• When the button is released, power is cut and the servo stops, leaving the lock in its current position.

Hardware

• Servo motor
• Door lock latch
• 9v battery
• Button (push‑to‑press)
• Arduino

How it works

• The servo is wired so that it runs continuously when power is present.
• The button is placed in the power line to the servo:
  • Button pressed → servo gets power → servo keeps rotating and moves the lock.
  • Button released → power is cut → servo stops.
• You design the mechanical linkage so that:
  • One stop position = locked
  • The other stop position = unlocked

Safety notes

• Make sure the servo can’t jam or force the lock too hard; add a small mechanical stop if needed.
• Test with hand power first to see which direction locks vs unlocks.
• You can later add an Arduino to control the button automatically (for example, with a web command or app).