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I would like a lock for a garage door (roll up style). I would like the lock to be something I can control electronically, and also I would like it to retain it's state when the power is removed.

The power requirement seems to rule out any type of electromagnetic lock, and I considered a solenoid, but I'm not sure if I can get one that stays in the current position when the power is removed.

I think there are two types that will work - one with a latch on a solenoid (https://www.adafruit.com/product/1512) or possibly a small linear actuator that could be extended through a plate to lock the door. Are there any other options I'm overlooking?

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You can get latching solenoids which fire back and forth given a current pulse. They stay in position when the current is removed.

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  • $\begingroup$ Thank you! I was looking for something like this but I didn't know what it was called. $\endgroup$
    – Ryan Sorensen
    Commented Dec 6, 2017 at 5:31
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You could consider using a motor/servo set-up. These would only use power when they're actually opening/closing the lock. For a small lock there's plenty of servo controlled units (from looking mostly for central locking on cars like this. They need a controller to drive the servo though. That said, a linear actuator would also work, but would need to know when it was fully closed/opened. Whether that be by limit/reed switches or the like.

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