I'm in the planning process of making an automated door unlocker for my home. The process for most of these is straight forward, but I'm having a problem creating a solution for my door type and was after some advise.
My door uses a key on both sides "multi-point locking system". This means to unlock the door, you need to have the key in, and turned. This applies to inside and outside. There is no pull-down dial or "rim automatic deadlatch" like a lot flats/apartments have. If a key is in the door one side, then a key won't fit fully in the lock at the otherside. A lot of locks are like this in the UK.
The problem I have is how to fit the hardware without changing the locks (rented property). The obvious first thought is to place the key in the lock and just drive a servo to turn it. But this would mean if it ever fails I would be perminantly locked out of my house! (no backdoor at my property...).
Can anyone think of a solution which could unlock the door without protentially "bricking" the door lock?