[qfqxmkuw] Emergency battery interface

A door lock with an electrical component will fail to function if it doesn't have electricity, for example, if its battery runs out.  If it is designed to fail secure, you won't be able to get through.

Provide a method to connect an emergency battery on the unsecured side.  Such a battery would be in addition to a secured main battery or other power source.  Someone worried about being locked out due to lack of power can carry an emergency battery to power the lock.  Of course, after getting in, one should correct the problem on the secured side that caused the lock to lose power in the first place.

Or, if one doesn't have a battery on hand when locked out, obtaining a battery is often much easier than obtaining a locksmith or other means to bypass the lock.

Assuming standardization, the same carried battery can power locks in many different locations, so it saves space over carrying multiple emergency keys.

Possible standardizations: AAA battery, coin cell, micro USB socket for power (attach a phone external battery).

[rysbedyh] Automatic light switch

Design a light with an ambient light sensor that automatically turns on the light when it becomes dark and turns it off when it becomes light.  This part is simple: many products already do this.

Fancier than that: a human can manually override the switch, turning the light off despite it being dark: perhaps it is time to sleep, or the human is leaving the room.  However, the manual override is not permanent.  The overridden light turns back on after another day-night cycle or light-dark cycle.

What should be the behavior if a light-dark cycle happens because of another light in the room has been turned on then off?  I think it should behave as if a day-night cycle happened: at least that is predictable and easy to understand.

The light automatically switches itself off when it becomes light.  This too can be manually overridden if the user wants the light on even if it is already light.  The manual override expires similarly after a dark period.  There might be a problem with a passing shadow on the light sensor being mistaken for a dark period.

[ogihsgnx] Push to antenna

Create a NFC device whose antenna becomes connected only when the user pushes a button on it.  This seems easy and possible to do cheaply.  One possible application is jewelry that can be used for identification or authentication via NFC, but the user doesn't want it to be constantly scannable, identifying the user remotely or without the user's permission.  Of course, if applicable, its security should be combined with something the user knows (e.g., password) in case the device falls into enemy hands.