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This discussion has been superseded by an actual implementation (yet to be documented)


  • External key override, for the case of software failure
  • Able to exit in a fire - either thumbturn, or handle.
  • Ideally in power outage door stays locked, so fail-secure, so long as fire safety is not compromised


Fail-safe options:

Fail-safe options can be considered but would mean building is insecure after battery backup fails

Magnetic lock

Bracken's yet another option???

       |           |
       |           |
       |           |<----Electric fail-safe strike with RFID/NFC = protokey (battery backup optional)
       |         ^-|-----Mechanical latch, internal handle, external key, backup only.
       |           |
       |           |
       |         <-|-----Current mechanical deadbolt with key = key
       |           |


  • Safe, can always escape unless keyholder locks protokeyholder and/or guest inside. Power/software failure not an issue.
  • Cheap and simple, easier to choose parts, protokey half needs not be heavy.
  • Secure, by virtue of the existing deadbolt (is it actually a deadbolt)? (yes, but no idea of security rating -AP)
  • Keyholder can always open/close space in power failure.


  • Keyholders also need protokey. (Is this a problem? -AP)
  • Malicious revoked keyholder can get in in power/backup failure.
  • Second backup key required for software failure, not power failure. (This is true for all options) -AP
  • Physical keys required to be cut for each new keyholder
  • More parts involved

Fail-secure Options:

  • Fail-secure options must have internal physical override for fire-escape in the event of power failure

Electric Nightlatch:

Eletric release/strike with mortice lock:

Another option?

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